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Code d'Examen: 1Z0-874
Nom d'Examen: MYSQL (MySQL 5.0 Database Administrator Certified Professional Exam, Part II)
Questions et réponses: 140 Q&As

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NO.1 Assuming that the account 'joe'@'%' does not already exist on the server, executing the statement
mysql> CREATE USER 'joe'@'%' IDENTIFIED BY 'sakila'
will have the following consequences:
A. The account 'joe'@'%' is created on the server. However, clients cannot connect using this account
until further privileges have been assigned to the account.
B. The account 'joe'@'%' is created on the server. Clients may connect to the server using this account,
but will not be able to access any databases, tables or stored routines
C. The account 'joe'@'%' is created on the server. Clients may connect to the server using this account
and execute stored routines, but will not be able to access any databases or tables
D. Nothing; there is no such command as CREATE USER
Answer: B

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NO.2 Consider the following query:
GRANT ALL ON world.* TO 'web'@'hostname'
What privileges would this give this user?
A. All privileges including GRANT.
B. All privileges except GRANT.
C. SELECT, INSERT, UPDATE and DELETE
D. ALL can not be used when granting privileges.
Answer: B

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NO.3 Which of the following best describes why InnoDB tables should always have primary keys and
why they should be short?
A. Because InnoDB uses primary keys to locate tables, and shorter keys make quicker lookups.
B. Because InnoDB uses primary keys to locate table rows, and shorter keys make quicker lookups.
C. Because InnoDB stores pointers in a log to all the primary keys and shorter keys make this log smaller.
Answer: B

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NO.4 Which of the following best describes what the master.info file contains and how it is used?
A. It contains the values from the CHANGE MASTER statement.
B. When the slave restarts it looks for which master to use from this file.
C. It contains information about the master server, its slaves and its configuration.
D. It is used by an administrator to determine what slaves connect to the master, and other information
about the master server.
Answer: D

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NO.5 For which of the following objects can privileges be specified?
A. Host
B. Global
C. Database
D. Table
E. Column
F. Row
Answer: C

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NO.6 Which of the following statements are true of how access control is based?
A. It is based off of an access control table in the mysql database.
B. It is based off of grant tables in the mysql database.
C. It is based off of an access control list stored in the data directory.
D. It is based off of an access control list stored inside the .frm files of each table.
Answer: B

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NO.7 Given the following MyISAM table structure:
mysql> desc city;
+-------------+----------+------+-----+---------+----------------
+
| Field | Type | Null | Key | Default | Extra
|
+-------------+----------+------+-----+---------+----------------
+
| ID | int(11) | | PRI | NULL | auto_increment
|
| Name | char(35) | | | |
|
| CountryCode | char(3) | | | |
|
| District | char(20) | | | | |
| Population | int(11) | | MUL | 0 | |
+-------------+----------+------+-----+---------+----------------+
and the following SQL statement:
SELECT Population
FROM city
WHERE Population = 10000
ORDER BY Population
LIMIT 5;
Which of the following statements best describes how MySQL optimizer executes the query?
A. The optimizer uses the primary key column ID to read the index values, then uses the index on
Population to filter the results. The optimizer will always choose to use a unique index first, then use a
secondary index if available.
B. The optimizer uses the index on the Population column to search and filter the WHERE clause.
A temporary table is used to perform a filesort on the results, and then only 5 records are returned to the
client.
C. The optimizer uses the index on the Population column to search, filter and sort the Population column,
then returns 5 records to the client. The optimizer does not need to read the data rows, and can return
values from the index only, because the index contains just integer values that form a leftmost prefix for
the key.
D. The optimizer uses the index on the Population column to search, filter and sort the Population column,
and returns 5 records to the client. The optimizer does not need to read the data rows, and can return
values from the index only because only those columns where specified in the
SELECT statement.
E. The optimizer will never read data from disk, since MySQL caches both data and index in the key
buffer.
Answer: D

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NO.8 What are reasons to prefer using GRANT and REVOKE statements over editing the privilege tables
directly?
A. Using GRANT and REVOKE allows the server to figure out the right tables and do all the appropriate
work
B. All grant tables in memory are immediately updated on GRANT and REVOKE
C. Making changes directly to the grant tables, one must remember to execute flush privileges to make
the changes take effect
D. GRANT and REVOKE statements allow you to do more fine-grained tuning of user privileges than
does editing the grant tables directly.
E. None of the above
Answer: B

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NO.9 Privileges for using stored routines can be specified at the following levels:
A. Server-wide
B. Per database
C. Per routine
D. The ability to use stored procedures is not governed by the privilege system.
Answer: A,B,C

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NO.10 Consider the following:
mysql> EXPLAIN SELECT Name FROM Country WHERE Code = 'CAN'\G
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: Country
type: const
possible_keys: PRIMARY
key: PRIMARY
key_len: 3
ref: const
rows: 1
Extra:
Which of the following best describes the meaning of the value of the type column?
A. The table has exactly one row.
B. Several rows may be read from the table.
C. Only one row of all its rows need to be read.
Answer: C

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NO.11 Consider the following GRANT statement:
GRANT USAGE ON *.* TO 'kofi'@'localhost' IDENTIFIED BY 'password'
What is the implications of executing that statement?
A. Kofi can access all database objects.
B. Kofi can access all his tables.
C. Kofi can display server system and status variables.
D. Kofi can grant privileges to others.
E. Kofi can access all database objects belonging to localhost.
Answer: C

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NO.12 You have been granted SELECT, INSERT and DELETE privileges on the table city in the world
database.
You log in, and exercise all your privileges without any problems.
While you are still connected and doing work, the administrator removes your DELETE privileges and
informs you by mail that you can no longer delete from table city.
Being skeptical, you decided to test your privileges and realize that you still have them all. What is are the
most likely causes of this?
A. The administrator forgot to revoke your UPDATE privilege
B. The administrator forgot to revoke your SELECT privilege
C. The administrator removed the DELETE privilege by performing an UPDATE directly on the
mysql.table_priv table
D. The administrator did not execute FLUSH PRIVILEGES
Answer: D

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NO.13 How can the SHOW PROCESSLIST command be helpful when optimizing queries?
A. It shows if a query is using an index or not.
B. It shows how the server processes a query.
C. If checked periodically, it can reveal queries that cause other queries to hang.
D. It shows the percentage of processing power that each query is using on a server.
Answer: C

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NO.14 Which of the following statements about the slow query log is true?
A. The slow query log will always contain just slow queries.
B. The slow query log may not always contain just slow queries.
C. The slow query log always logs more than just slow queries.
Answer: B

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NO.15 How can stored routines be used to check for constraints or legality of incoming data?
A. They can make use of the VALIDATE DEFINER setting.
B. They can not be used to check for constraints or legality of data.
C. They can check and only perform an action if the incoming values match a specified value.
Answer: C

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NO.16 Which of the following statements are required to create a key cache of 4 MB, assign the MyISAM table
world. City to it and preload the index.?
A. mysql> SET GLOBAL city_cache.key_buffer_size = 4194304;mysql> CACHE INDEX world.City IN
city_cache;mysql> LOAD INDEX INTO CACHE world.City;
B. mysql> ALTER TABLE world.city KEY_CACHE = 4194304;
C. mysql> CREATE CACHE FOR world.City SIZE = 4194304;
D. It is not possible to create a key cache for a specific MyISAM table, only the global key cache can be
used.
Answer: A

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NO.17 Which of the following best describes how the relay log works?
A. It records the times when the slave connects to the master.
B. When a slave receives a change from the master, it is recorded in the relay log first and
processed later.
C. When a slave receives a change from the master, it is processed first and then recorded in the relay
log.
Answer: B

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NO.18 When working with stored routines, which of the following are true in regards to the effect on the
amount of data exchanged between client and server?
A. They may increase the amount of data exchanged.
B. They can help reduce the amount of data exchanged.
C. They have no effect on the amount of data exchanged.
Answer: B

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NO.19 With replication, what on the master is used to send commands to the slave?
A. The relay log.
B. The binary log.
C. The SQL Thread.
Answer: B

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NO.20 The stored function year_to_date is created by the 'root'@'localhost' account as follows:
CREATE FUNCTION year_to_date ()
RETURNS DECIMAL(10,2)
SQL SECURITY DEFINER
BEGIN ...
END;
Within the routine body, a number of calculations are made on data in the financials table and the
calculated value is returned. The only account which can access the financials table is 'root'@'localhost'.
If a client connects with the account 'joe'@'localhost' and calls the year_to_date function, what will
happen?
A. The function will always execute as if it was 'root'@'localhost' that invoked it since SQL
SECURITY
DEFINER has been specified.
B. The function will not execute, as 'joe'@'localhost' does not have access to the financials table
C. The function will not execute as SQL SECURITY DEFINER has been specified. It would execute if
instead SQL SECURITY INVOKER had been specified
D. If the account 'joe'@'localhost' has the EXECUTE privilege on year_to_date, the function will complete
successfully
Answer: D

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Code d'Examen: 006-002
Nom d'Examen: MYSQL (Certified MySQL 5.0 DBA Part II)
Questions et réponses: 140 Q&As

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NO.1 What kind of replication is supported by the MySQL server?
A. Multiple-master replication
B. Master to slave replication
C. Single file based clustering
D. MySQL doesn't support replication
Answer: B

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NO.2 The stored function year_to_date is created by the 'root'@'localhost' account as follows:
CREATE FUNCTION year_to_date ()
RETURNS DECIMAL(10,2)
SQL SECURITY DEFINER
BEGIN
...
END;
Within the routine body, a number of calculations are made on data in the financials table and the
calculated value is returned. The only account which can access the financials table is 'root'@'localhost'.
If a client connects with the account 'joe'@'localhost' and calls the year_to_date function, what will
happen?
A. The function will not execute, as 'joe'@'localhost' does not have access to the financials table
B. The function will not execute as SQL SECURITY DEFINER has been specified. It would execute if
instead SQL SECURITY INVOKER had been specified
C. The function will always execute as if it was 'root'@'localhost' that invoked it since SQL SECURITY
DEFINER has been specified.
D. If the account 'joe'@'localhost' has the EXECUTE privilege on year_to_date, the function will complete
successfully
Answer: D

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NO.3 When working with replication, why might you want to stop the SQL thread on the slave while keeping
the I/O thread running?
A. So that no changes are made while making backups.
B. So that events for the slave do not get backlogged on the master.
C. So that remaining events can be processed while not receiving new events from the master.
Answer: AB

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NO.4 In regards to security, which of the following statements are true?
A. mysqld should not be run as root or administrator.
B. mysqld should be run as root or administrator.
C. The user owning the server process should own all files and directories to which the server may write.
D. The root or admininistrator users should own all files related to the server process
Answer: AC

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NO.5 Which of the following statements are true of compressed tables?
A. They can be uncompressed.
B. They can not be uncompressed.
C. They can be uncompressed but some data corruption may occur.
Answer: A

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NO.6 What type of resource limitations may be placed on a user account with the GRANT statement?
A. The number of times per hour that an account is allowed to connect to the server
B. The number of queries per hour an account is allowed to issue
C. The number of updates per hour an account is allowed to issue
D. The maximum number of simultaneous connections an account can have
E. Resource limits can only be specified globally, not per-account
F. MySQL does not have provisions for limiting resource usage
Answer: ABCD

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NO.7 Can multi-column FULLTEXT indexes be used? If so, when?
A. No, they can not be used.
B. Yes, they should be used to search multiple columns simultaneously.
C. Yes, they can be used to search either one or all of the indexed columns.
Answer: B

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NO.8 Which of the following best describes what the master.info file contains and how it is used?
A. It contains the values from the CHANGE MASTER statement.
B. When the slave restarts it looks for which master to use from this file.
C. It contains information about the master server, its slaves and its configuration.
D. It is used by an administrator to determine what slaves connect to the master, and other information
about the master server.
Answer: AB

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NO.9 Is it possible to tell the MySQL server to throw an error on division-by-zero rather than converting it to
NULL and a warning?
A. No, it has to be done programmatically.
B. Yes, by updating a system variable.
C. Yes, there is a SQL mode that exists for that.
D. No, division-by-zero is always converted regardless of any setting.
Answer: C

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NO.10 What are reasons to prefer using GRANT and REVOKE statements over editing the privilege tables
directly?
A. Using GRANT and REVOKE allows the server to figure out the right tables and do all the appropriate
work
B. All grant tables in memory are immediately updated on GRANT and REVOKE
C. Making changes directly to the grant tables, one must remember to execute flush privileges to make
the changes take effect
D. GRANT and REVOKE statements allow you to do more fine-grained tuning of user privileges than
does editing the grant tables directly.
E. None of the above
Answer: ABC

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NO.11 When performing diagnostic functions on a server should excessive start and stop messages be looked
for in the error log, and why?
A. No, start and stop messages are of no relevance to diagnostics.
B. Yes, because there is a bug in mysqld that can cause multiple start and stop messages to be inserted
in the log.
C. No, because they will not provide any information as to what is wrong.
D. Yes, because they can indicate that there is something causing the server to restart unexpectedly and
not due to normal startup and shutdown.
Answer: D

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NO.12 Which of the following best describe the effects on performance for the dynamic-row format for
MyISAM has?
A. Retrievals are more complex and slower.
B. Retrievals are less complex and are faster.
C. Rows generally take up less disk space than fixed-row format.
D. Rows generally take up more disk space than fixed-row format.
Answer: AC

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NO.13 In the following query, the Population column is indexed:
mysql> EXPLAIN SELECT Name
-> FROM Country
-> WHERE Code LIKE '%B%' AND Population > 10000
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: Country
type: ALL
possible_keys: i_pop
key: NULL
key_len: NULL
ref: NULL
rows: 239
Extra: Using where
Which of the following best describes how to deal with the key value of the EXPLAIN output?
A. Use FORCE KEY
B. Use USE INDEX.
C. Use FORCE INDEX.
D. Use USE POSSIBLE_KEY
Answer: BC

MYSQL   006-002   006-002   006-002

NO.14 Which of the following statements are true regarding the structure of grant tables in new distributions?
A. They change with every upgrade.
B. They are often changed.
C. They remain the same for backwards compatibility.
Answer: B

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NO.15 Which of the following optimizations could be made based on data collected in the slow query log?
A. Tune server parameters.
B. Change the storage engines in use.
C. Make changes to the network infrastructure.
D. Rewrite queries to perform more efficiently.
E. Normalize data or add indexes to the tables that the queries use.
Answer: ABDE

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NO.16 Which of the following are important network factors for remote MySQL clients?
A. Latency.
B. Firewalls.
C. Throughput speed.
D. The type of routers used.
Answer: AC

MYSQL   006-002 examen   006-002

NO.17 Which of the following statements best describe the key buffer?
A. It is a global buffer.
B. It is set on a per-connection basis.
C. It caches index blocks for MyISAM tables only.
D. It caches index blocks for InnoDB tables only.
E. It caches index blocks for all storage engine tables.
Answer: AC

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NO.18 Consider the following EXPLAIN output.
mysql> EXPLAIN SELECT Name FROM City WHERE Population > 8000000
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: City
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: 4079
Extra: Using where
Which of the following statements are true?
A. The query cannot be optimized any better.
B. No index could be used to perform the query.
C. All 4079 rows of the table need to examined.
D. The Name column should be indexed.
E. The Population column should be indexed.
Answer: BCE

MYSQL   006-002   006-002   006-002   006-002

NO.19 The user 'joe' connecting from the host example.com has full access to all databases on the server:
mysql> SHOW GRANTS FOR 'joe'@'example.com';
+----------------------------------------------------+
| Grants for joe@example.com |
+----------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'joe'@'example.com' |
+----------------------------------------------------+
1 row in set (0.00 sec)
You need to restrict the user from accessing the mysql database. Will the following statement do this?
REVOKE ALL PRIVILEGES ON mysql.* FROM 'joe'@'example.com'
A. Yes
B. No
C. The answer cannot be determined from the information provided.
Answer: B

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NO.20 Which of the following is/are valid reasons to consider using --skip-networking?
A. Your server is not networked to other servers.
B. You do not have a need for remote clients to connect.
C. You have a need for remote clients to connect.
D. You are not going to use replication or clustering.
Answer: B

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NO.21 Which of the following best describes what MASTER_LOG_FILE and MASTER_LOG_POS provides?
A. The path of the log file.
B. The file to log replication actions to.
C. The masters binary log name used for replication.
D. The position in the masters binary log in which to start replication.
Answer: CD

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NO.22 Consider the following:
mysql> EXPLAIN SELECT Name FROM Country WHERE Code = 'CAN'
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: Country
type: const
possible_keys: PRIMARY
key: PRIMARY
key_len: 3
ref: const
rows: 1
Extra:
Which of the following best describes the meaning of the value of the type column?
A. The table has exactly one row.
B. Several rows may be read from the table.
C. Only one row of all its rows need to be read.
Answer: C

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NO.23 Which of the following would be considered a good candidate table for compression?
A. A table with data that needs only few updates in the future.
B. A table with data that will not be updated in the future.
C. A large table, such as those used for data warehousing.
D. All MyISAM tables are good candidates for compression.
Answer: B

MYSQL   006-002   006-002 examen   006-002   006-002 examen

NO.24 Which of the following statements are true regarding wildcards in the host name of an account
specification?
A. The '%' character is used to match any number of characters or numbers
B. The '*' character is used to match any number of characters or numbers
C. The '_' character is used to match any number of characters or numbers
D. The '.' character is used to match any single character or number
E. Wildcards may be used to match any number of characters at the beginning of the host name or IP
address only
F. Wildcards may be used to match any number of characters at the end of the host name or IP address
only
G. Wildcards may be used to match any number of characters anywhere in the host name or IP address
Answer: AG

MYSQL   006-002 examen   006-002   006-002   006-002

NO.25 Does max_connections have an affect on the number of slaves that may connect to a master?
A. No, because slaves are not really clients.
B. Yes, because each slave is effectively a connected user.
C. No, because slaves do not use the same type of connection as a regular client.
D. Yes, because if the server has too many connections, it may slow the slaves down.
Answer: B

MYSQL   006-002   006-002   006-002 examen

NO.26 For which of the following objects can privileges be specified?
A. Host
B. Global
C. Database
D. Table
E. Column
F. Row
Answer: BCDE

MYSQL   006-002   006-002

NO.27 Which of the following best describes why InnoDB tables should always have primary keys and why
they should be short?
A. Because InnoDB uses primary keys to locate tables, and shorter keys make quicker lookups.
B. Because InnoDB uses primary keys to locate table rows, and shorter keys make quicker lookups.
C. Because InnoDB stores pointers in a log to all the primary keys and shorter keys make this log smaller.
Answer: B

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NO.28 The type of file system you chose may affect MySQL use and/or performance with regard to...
A. Table opening time.
B. Size limits of files.
C. Time to recover from a crash.
D. The number of users MySQL can handle.
E. The type of storage engines that can be used.
Answer: ABC

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NO.29 Assuming that the user account 'joe'@'example.com' exists, executing DROP USER
'joe'@'example.com' has the following consequences:
A. The user account will immediately be removed from the server, if no object-level privileges are in effect
for that account
B. The account will be removed from the server the next time FLUSH PRIVILEGES is executed, if no
object-level privileges are in effect for that account
C. The account and all associated privileges will immediately be removed from the server
D. The user account and all associated privileges will be removed from the server the next time FLUSH
PRIVILEGES is executed.
Answer: C

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NO.30 How can stored routines be used to check for constraints or legality of incoming data?
A. They can make use of the VALIDATE DEFINER setting.
B. They can not be used to check for constraints or legality of data.
C. They can check and only perform an action if the incoming values match a specified value.
Answer: C

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Code d'Examen: 005-002
Nom d'Examen: MYSQL (Certified MySQL 5.0 DBA Part I)
Questions et réponses: 140 Q&As

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NO.1 MySQL is a multi-threaded database server. Every connection to the database server is handled by
it's own thread.
A. True
B. False
Answer: A

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NO.2 What are some properties of using LOCK TABLE?
A. Less work is required by the server to acquire and release locks.
B. It can only be used with the MyISAM storage engine.
C. Using LOCK TABLE sometimes decreases the amount disk reads and writes needed for a group of
statements.
D. All tables must be locked in a single statement.
E. It creates more disk activity.
Answer: ACD

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NO.3 Will the following SELECT query list all of the tables in the INFORMATION_SCHEMA database? If not,
why?
SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = 'INFORMATION_SCHEMA'
ORDER BY TABLE_NAME
A. Yes.
B. No; the INFORMATION_SCHEMA database does not contain information on itself.
C. No; the WHERE clause is incorrect. The correct field name is TABLE_SCHEMATA.
D. No; there is no table in the INFORMATION_SCHEMA database called TABLES.
Answer: A

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NO.4 Which of the following are some benefits of using MySQL built binaries over binaries built by yourself?
A. They are highly optimized.
B. They are cross-platform.
C. Many are built using commercial compilers that produce a better quality build than with freely available
compilers.
D. They will work with tools such as MySQL Administrator and MySQL Query Browser.
E. They may include libraries not available in the standard operating system library.
Answer: ACE

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NO.5 In a standard MySQL installation which of following files are stored below the data directory?
A. Format files for all the tables
B. Data and index files for MyISAM tables
C. InnoDB tablespace files
D. General server logs
E. MySQL upgrade script files
Answer: ABCD

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NO.6 Suppose you have a server that has been started with the --myisam-recover option. When does the
server perform the check on the MyISAM tables?
A. Each time the server is started.
B. Each time it encounters an error.
C. Each time it opens the MyISAM table files.
D. Each time the CHECK TABLE command is issued.
Answer: C

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NO.7 Index analysis and optimization using ANALYZE and OPTIMIZE statements should...
A. generally never be run manually
B. be run once the table reaches 100,000 rows or above
C. be run when more than 5% of the rows are changed by a single statement
D. be run when EXPLAIN SELECT shows that an inordinate amount of rows is expected to be read during
query execution
E. be run when you suspect that a table is heavily fragmented
Answer: DE

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NO.8 Which of the following are true regarding the table cache?
A. It is used to cache row data in open tables
B. It holds file descriptors for open tables
C. The size of the table cache may be set per-session
D. Each connection has its own table cache. They are of equal size, set globally.
E. There is one table cache, shared among all sessions.
F. Increasing the size of the variable table_cache allows mysqld to keep more tables open simultaneously
Answer: BEF

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NO.9 Consider the following query:
DELETE FROM INFORMATION_SCHEMA.TABLES
WHERE table_schema = 'world'
AND table_name = 'Country'
What would be the result of executing this query?
A. An error would be issued
B. A warning would be issued
C. The row would be deleted from the INFORMATION_SCHEMA.TABLES table, and the table Country
would be dropped from the world database
D. The row would be deleted from the INFORMATION_SCHEMA, but the table Country in the world
database would be unaffected.
Answer: A

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NO.10 Which of the following correctly defines dirty reads, non-repeatable reads and phantom row?
A. A dirty read is a read by one transaction of uncommitted changes made by another transaction.
B. A dirty read is a read by one transaction of its uncommitted changes.
C. A non-repeatable read occurs when a transaction performs the same retreival twice but gets a different
result each time.
D. A non-repeatable read is a row that appears where it was not visible before.
E. A phantom is a row that appears where it was not visible before.
F. A phantom is a read by one transaction of uncommitted changes made by another transaction.
Answer: ACE

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NO.11 Which of the following are requirements for MyISAM binary portability?
A. Both machines must use the same operating system.
B. Database and table names must use lowercase format.
C. Both machines must use IEEE floating-point format or contain no floating-point columns.
D. Both machines must use two's-complement integer arithmetic.
Answer: CD

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NO.12 Which of the following are true for how BTREE and HASH index types should be used for MEMORY
tables?
A. HASH index types are only for use with equality comparisions such as those using the = and <=>
operators.
B. BTREE index types are preferable for use with comparisons that do not just use equality operators
such as = and <=>
C. BTREE index types are only for use with equality comparisons such as those using the = and <=>
operators.
D. HASH index types are preferable for use with comparisons that do not just use equality operators such
as = and <=>
Answer: AB

MYSQL examen   certification 005-002   005-002   005-002

NO.13 Which of the following are some general properties of the mysqlimport client program?
A. It loads data files into tables.
B. It can load files only on the server host.
C. It provides a command-line interface to the LOAD DATA INFILE.
D. It can load files both on the client and server host.
E. It bypasses the server and writes directly to the corresponding data files.
Answer: ACD

MYSQL   005-002   certification 005-002   005-002   certification 005-002

NO.14 Which of the following best describes why table locking is often not desirable compared to page or row
locking?
A. Table locks can have deadlocks.
B. Table locks create concurrency issues.
C. Table locks prevent other clients from making any changes to the table until released.
D. Table locks can cause data corruption issues if more than one client tries to make changes while
locked.
Answer: BC

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NO.15 Another user has issued the statement LOCK TABLE pets FOR WRITE
You can...
A. Update table pets
B. SELECT from table pets
C. Update and SELECT from table pets
D. None of the above
Answer: D

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NO.16 The ANALYZE TABLE command should be used...
A. When you need to find out why a query is taking a long time to execute.
B. To improve performance by updating index distribution statistics.
C. After large amounts of table data have changed.
D. To check a tables structure to see if it may have been damaged and needs repair.
Answer: BC

MYSQL   005-002   005-002   005-002   005-002

NO.17 Which of the following statements are true regarding table locks?
A. They can only be released by the client holding them.
B. They can be released by other connections than the client holding them.
C. They are implicitly released when the connection is closed.
D. They are not released when the connection is closed
Answer: AC

MYSQL examen   005-002   005-002

NO.18 Which of the following APIs/connectors are included in a MySQL distribution?
A. Connector/J
B. Connector/ODBC
C. C API
D. Connector/NET
E. Connector/MJX
Answer: C

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NO.19 Which of the following statements is true for mysqldump?
A. It can dump data only on remote servers.
B. It can dump data only on the local server.
C. It can dump data on both local and remote servers.
Answer: C

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NO.20 Which of the following actions are performed during an RPM installation of the MySQL server
package?
A. Setup a mysql user
B. Setup a mysql group
C. Initialize the data directory
D. Setup passwords for all default accounts.
Answer: ABC

certification MYSQL   005-002   005-002   005-002 examen

NO.21 Suppose you have a column in which most records are going to be between 30 and 32 characters.
Which of the following column types would be most efficient?
A. VARCHAR
B. CHAR
C. TEXT
D. Either VARCHAR or CHAR
Answer: B

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NO.22 Which of the following statements are true?
A. InnoDB supports Foreign Keys.
B. MyISAM supports Foreign Keys.
C. InnoDB supports cascaded DELETE statements.
D. MyISAM supports cascaded DELETE statements.
E. InnoDB supports cascaded UPDATE statements.
F. MyISAM supports cascaded UPDATE statements.
Answer: ACE

MYSQL   005-002 examen   005-002   005-002 examen   005-002

NO.23 Assume you compile MySQL from source and invoke configure with the following options.
--with-charset=latin1 --with-extra-charsets=utf8,ucs2
Compared to a standard binary installation that contains many more character sets, which of the following
statements is/are true?
A. The compiled version will use less disk space, because only a few character sets will be installed on
disk.
B. The compiled version will use less memory, because only a few character sets will be loaded by the
server.
C. The compiled version will use less file handles, because only a few files need to be opened when the
server is started.
Answer: AB

MYSQL   005-002   certification 005-002   005-002   005-002

NO.24 Which of the following are some general capabilites of the mysql client program?
A. Create and Drop databases
B. Ping the server
C. Create, Drop, and modify tables and indexes.
D. Shutdown the server.
E. Create users.
F. Display replication server status.
Answer: ACEF

MYSQL examen   005-002   005-002

NO.25 Which of the following steps should be taken to restore an InnoDB table to a consistent state without
having to shutdown the server?
A. Run the REPAIR TABLE command.
B. Dump the table with mysqldump, drop the table then re-create from the dump file.
C. Run the CHECK TABLE command.
D. Dump the table with mysqlhotcopy, drop the table then re-create with the backup file.
Answer: B

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NO.26 mysqldump can be instructed to include commands to drop and recreate tables before trying to create
or load data.
A. True
B. False
Answer: A

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NO.27 Which of the following best describes the scope of explicitly and implicitly set locks?
A. Explicitly set locks may span several commands.
B. Implicitly set locks may span several commands.
C. Implicitly set locks will span only one statement or transaction.
D. Explicitly set locks will span only one statement or transaction.
Answer: ABC

MYSQL examen   005-002   certification 005-002   certification 005-002

NO.28 Which mysqld command line option disables incoming TCP/IP connections?
A. --shared-memory
B. --memlock
C. --no-networking
D. --skip-networking
Answer: D

MYSQL examen   005-002   005-002 examen   005-002

NO.29 Which of the following statements are true regarding the InnoDB storage engine?
A. It uses multiversioning to isolate transactions.
B. It is not possible for deadlocks to occur.
C. It does not isolate transactions.
D. It is possible for deadlocks to occur.
Answer: AD

certification MYSQL   005-002   005-002

NO.30 What are some advantages of using the SHOW command rather than using the
INFORMATION_SCHEMA?
A. It is available for releases older than MySQL 5.0.
B. It returns results quicker than using the INFORMATION_SCHEMA.
C. Using SHOW can provide more concise information.
D. SHOW is a feature of standard SQL, and INFORMATION_SCHEMA is a MySQL specific command.
Answer: AC

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Code d'Examen: 1Z0-874
Nom d'Examen: MYSQL (MySQL 5.0 Database Administrator Certified Professional Exam, Part II)
Questions et réponses: 140 Q&As

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NO.1 Which of the following statements are required to create a key cache of 4 MB, assign the MyISAM table
world. City to it and preload the index.?
A. mysql> SET GLOBAL city_cache.key_buffer_size = 4194304;mysql> CACHE INDEX world.City IN
city_cache;mysql> LOAD INDEX INTO CACHE world.City;
B. mysql> ALTER TABLE world.city KEY_CACHE = 4194304;
C. mysql> CREATE CACHE FOR world.City SIZE = 4194304;
D. It is not possible to create a key cache for a specific MyISAM table, only the global key cache can be
used.
Answer: A

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NO.2 When working with stored routines, which of the following are true in regards to the effect on the
amount of data exchanged between client and server?
A. They may increase the amount of data exchanged.
B. They can help reduce the amount of data exchanged.
C. They have no effect on the amount of data exchanged.
Answer: B

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NO.3 Assuming that the account 'joe'@'%' does not already exist on the server, executing the statement
mysql> CREATE USER 'joe'@'%' IDENTIFIED BY 'sakila'
will have the following consequences:
A. The account 'joe'@'%' is created on the server. However, clients cannot connect using this account
until further privileges have been assigned to the account.
B. The account 'joe'@'%' is created on the server. Clients may connect to the server using this account,
but will not be able to access any databases, tables or stored routines
C. The account 'joe'@'%' is created on the server. Clients may connect to the server using this account
and execute stored routines, but will not be able to access any databases or tables
D. Nothing; there is no such command as CREATE USER
Answer: B

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NO.4 Which of the following best describes why InnoDB tables should always have primary keys and
why they should be short?
A. Because InnoDB uses primary keys to locate tables, and shorter keys make quicker lookups.
B. Because InnoDB uses primary keys to locate table rows, and shorter keys make quicker lookups.
C. Because InnoDB stores pointers in a log to all the primary keys and shorter keys make this log smaller.
Answer: B

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NO.5 With replication, what on the master is used to send commands to the slave?
A. The relay log.
B. The binary log.
C. The SQL Thread.
Answer: B

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NO.6 For which of the following objects can privileges be specified?
A. Host
B. Global
C. Database
D. Table
E. Column
F. Row
Answer: C

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NO.7 Which of the following best describes what the master.info file contains and how it is used?
A. It contains the values from the CHANGE MASTER statement.
B. When the slave restarts it looks for which master to use from this file.
C. It contains information about the master server, its slaves and its configuration.
D. It is used by an administrator to determine what slaves connect to the master, and other information
about the master server.
Answer: D

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NO.8 What are reasons to prefer using GRANT and REVOKE statements over editing the privilege tables
directly?
A. Using GRANT and REVOKE allows the server to figure out the right tables and do all the appropriate
work
B. All grant tables in memory are immediately updated on GRANT and REVOKE
C. Making changes directly to the grant tables, one must remember to execute flush privileges to make
the changes take effect
D. GRANT and REVOKE statements allow you to do more fine-grained tuning of user privileges than
does editing the grant tables directly.
E. None of the above
Answer: B

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NO.9 Given the following MyISAM table structure:
mysql> desc city;
+-------------+----------+------+-----+---------+----------------
+
| Field | Type | Null | Key | Default | Extra
|
+-------------+----------+------+-----+---------+----------------
+
| ID | int(11) | | PRI | NULL | auto_increment
|
| Name | char(35) | | | |
|
| CountryCode | char(3) | | | |
|
| District | char(20) | | | | |
| Population | int(11) | | MUL | 0 | |
+-------------+----------+------+-----+---------+----------------+
and the following SQL statement:
SELECT Population
FROM city
WHERE Population = 10000
ORDER BY Population
LIMIT 5;
Which of the following statements best describes how MySQL optimizer executes the query?
A. The optimizer uses the primary key column ID to read the index values, then uses the index on
Population to filter the results. The optimizer will always choose to use a unique index first, then use a
secondary index if available.
B. The optimizer uses the index on the Population column to search and filter the WHERE clause.
A temporary table is used to perform a filesort on the results, and then only 5 records are returned to the
client.
C. The optimizer uses the index on the Population column to search, filter and sort the Population column,
then returns 5 records to the client. The optimizer does not need to read the data rows, and can return
values from the index only, because the index contains just integer values that form a leftmost prefix for
the key.
D. The optimizer uses the index on the Population column to search, filter and sort the Population column,
and returns 5 records to the client. The optimizer does not need to read the data rows, and can return
values from the index only because only those columns where specified in the
SELECT statement.
E. The optimizer will never read data from disk, since MySQL caches both data and index in the key
buffer.
Answer: D

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NO.10 Consider the following query:
GRANT ALL ON world.* TO 'web'@'hostname'
What privileges would this give this user?
A. All privileges including GRANT.
B. All privileges except GRANT.
C. SELECT, INSERT, UPDATE and DELETE
D. ALL can not be used when granting privileges.
Answer: B

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NO.11 Which of the following statements about the slow query log is true?
A. The slow query log will always contain just slow queries.
B. The slow query log may not always contain just slow queries.
C. The slow query log always logs more than just slow queries.
Answer: B

MYSQL   1Z0-874 examen   1Z0-874   1Z0-874

NO.12 Privileges for using stored routines can be specified at the following levels:
A. Server-wide
B. Per database
C. Per routine
D. The ability to use stored procedures is not governed by the privilege system.
Answer: A,B,C

MYSQL   1Z0-874   1Z0-874   1Z0-874

NO.13 Which of the following best describes how the relay log works?
A. It records the times when the slave connects to the master.
B. When a slave receives a change from the master, it is recorded in the relay log first and
processed later.
C. When a slave receives a change from the master, it is processed first and then recorded in the relay
log.
Answer: B

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NO.14 Which of the following statements are true of how access control is based?
A. It is based off of an access control table in the mysql database.
B. It is based off of grant tables in the mysql database.
C. It is based off of an access control list stored in the data directory.
D. It is based off of an access control list stored inside the .frm files of each table.
Answer: B

MYSQL   1Z0-874   1Z0-874

NO.15 You have been granted SELECT, INSERT and DELETE privileges on the table city in the world
database.
You log in, and exercise all your privileges without any problems.
While you are still connected and doing work, the administrator removes your DELETE privileges and
informs you by mail that you can no longer delete from table city.
Being skeptical, you decided to test your privileges and realize that you still have them all. What is are the
most likely causes of this?
A. The administrator forgot to revoke your UPDATE privilege
B. The administrator forgot to revoke your SELECT privilege
C. The administrator removed the DELETE privilege by performing an UPDATE directly on the
mysql.table_priv table
D. The administrator did not execute FLUSH PRIVILEGES
Answer: D

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NO.16 How can stored routines be used to check for constraints or legality of incoming data?
A. They can make use of the VALIDATE DEFINER setting.
B. They can not be used to check for constraints or legality of data.
C. They can check and only perform an action if the incoming values match a specified value.
Answer: C

MYSQL   1Z0-874   1Z0-874

NO.17 The stored function year_to_date is created by the 'root'@'localhost' account as follows:
CREATE FUNCTION year_to_date ()
RETURNS DECIMAL(10,2)
SQL SECURITY DEFINER
BEGIN ...
END;
Within the routine body, a number of calculations are made on data in the financials table and the
calculated value is returned. The only account which can access the financials table is 'root'@'localhost'.
If a client connects with the account 'joe'@'localhost' and calls the year_to_date function, what will
happen?
A. The function will always execute as if it was 'root'@'localhost' that invoked it since SQL
SECURITY
DEFINER has been specified.
B. The function will not execute, as 'joe'@'localhost' does not have access to the financials table
C. The function will not execute as SQL SECURITY DEFINER has been specified. It would execute if
instead SQL SECURITY INVOKER had been specified
D. If the account 'joe'@'localhost' has the EXECUTE privilege on year_to_date, the function will complete
successfully
Answer: D

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NO.18 Consider the following:
mysql> EXPLAIN SELECT Name FROM Country WHERE Code = 'CAN'\G
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: Country
type: const
possible_keys: PRIMARY
key: PRIMARY
key_len: 3
ref: const
rows: 1
Extra:
Which of the following best describes the meaning of the value of the type column?
A. The table has exactly one row.
B. Several rows may be read from the table.
C. Only one row of all its rows need to be read.
Answer: C

MYSQL   certification 1Z0-874   certification 1Z0-874   1Z0-874

NO.19 Consider the following GRANT statement:
GRANT USAGE ON *.* TO 'kofi'@'localhost' IDENTIFIED BY 'password'
What is the implications of executing that statement?
A. Kofi can access all database objects.
B. Kofi can access all his tables.
C. Kofi can display server system and status variables.
D. Kofi can grant privileges to others.
E. Kofi can access all database objects belonging to localhost.
Answer: C

MYSQL   1Z0-874   1Z0-874   1Z0-874 examen

NO.20 How can the SHOW PROCESSLIST command be helpful when optimizing queries?
A. It shows if a query is using an index or not.
B. It shows how the server processes a query.
C. If checked periodically, it can reveal queries that cause other queries to hang.
D. It shows the percentage of processing power that each query is using on a server.
Answer: C

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Code d'Examen: 1Z0-872
Nom d'Examen: MYSQL (MySQL 5.0 Developer Certified Professional Exam, Part II)
Questions et réponses: 70 Q&As

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NO.1 Which of the following describe situations when MySQL generates warnings?
A. When it is not able to completely fulfill a request.
B. When a system-level error occurs.
C. When an action has possible unintended side-effects.
Answer: A,C

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NO.2 Which of the following is a valid method to restrict the amount of records returned from SHOW
WARNINGS.?
A. SHOW WARNINGS LIMIT
B. SHOW WARNINGS LIMIT
C. limit can not be used with show warnings
Answer: A,B

MYSQL examen   1Z0-872   1Z0-872

NO.3 Which of the following are valid optimization techniques?
A. Rewrite queries to use indexes
B. Use EXPLAIN
C. Use ORDER BY
Answer: A,B

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NO.4 Using column prefix indexing helps reduce
A. The amount of time to write a query
B. The number of results returned
C. The amount of disk I/O needed
D. The amount of disk space needed
Answer: C,D

MYSQL examen   1Z0-872   1Z0-872   1Z0-872

NO.5 Consider the following statement: show COUNT (*) warnings what would be the result of executing this
statement?
A. An error would be returned, as this is not valid syntax.
B. The number of current warnings would be returned.
C. The total number of warnings server-wide would be returned
Answer: B

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NO.6 For maximum efficiency in join operations of one column from each of two tables, which of the following
statements regarding indexes are true?
A. In a LEFT JOIN such as table1 LEFT JOIN table2 ON table1 .a = table2.b, the column b in table2
should always be indexed
B. A LEFT JOIN would not benefit from either of the participating columns being indexed
C. In an INNER JOIN, either, but not both, columns participating in the join should be indexed
D. In an INNER JOIN, both columns participating in the join should be indexed
E. An INNER JOIN would not benefit from either of the participating columns being indexed F. In a LEFT
JOIN such as table 1 LEFT JOIN table2 ON table 1 .a = table2.b, the column a in table 1should always be
indexed
Answer: A,D

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NO.7 Which of the following best describes how a column prefix index works and why its an advantage?
A. A Column prefix allows for a shorter index, making it read less from disk,
B. A Column prefix allows for a shorter index name, making less code to be written.
C. A Column prefix is another name for a left-most prefix, which is usefully with multi-column indexes.
Answer: A

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NO.8 Which of the following best describes the major trade-offs for MylSAM fixed-length types vs.
variable-length types, respectively?
A. Fixed-length are slower, but require less disk space, as variable-length are faster, but require more disk
space.
B. Fixed-length are faster and require less disk space, as variable-length are slower and require more
disk space.
C. Fixed-length are faster, but require more disk space, as variable-length are slower, but require less disk
space.
D. Fixed-length are slower and require more disk space, as variable-length are faster and require less
disk space.
Answer: C

certification MYSQL   1Z0-872   1Z0-872   1Z0-872

NO.9 When executing multi-row operations, what should be the first thing you look for to see if anything
unexpected happened?
A. Warning/Error Count.
B. Warning/Error Codes.
C. Warning/Error messages.
Answer: A

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NO.10 Which of the following statements are true?
A. The MylSAM storage engine should be preferred when you expect many reads and few updates to
occur
B. The MylSAM storage engine should be preferred when you expect a mix of many reads and many
updates to occur
C. The InnoDB storage engine should be preferred when you expect many reads and few updates to
occur
D. The InnoDB storage engine should be preferred when you expect a mix of many reads and many
updates to occur
Answer: A,D

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Code d'Examen: 006-002
Nom d'Examen: MYSQL (Certified MySQL 5.0 DBA Part II)
Questions et réponses: 140 Q&As

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NO.1 Can multi-column FULLTEXT indexes be used? If so, when?
A. No, they can not be used.
B. Yes, they should be used to search multiple columns simultaneously.
C. Yes, they can be used to search either one or all of the indexed columns.
Answer: B

MYSQL   006-002 examen   006-002   006-002 examen

NO.2 Which of the following statements are true of compressed tables?
A. They can be uncompressed.
B. They can not be uncompressed.
C. They can be uncompressed but some data corruption may occur.
Answer: A

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NO.3 Which of the following best describes what MASTER_LOG_FILE and MASTER_LOG_POS provides?
A. The path of the log file.
B. The file to log replication actions to.
C. The masters binary log name used for replication.
D. The position in the masters binary log in which to start replication.
Answer: CD

MYSQL examen   certification 006-002   certification 006-002   006-002 examen   certification 006-002

NO.4 Does max_connections have an affect on the number of slaves that may connect to a master?
A. No, because slaves are not really clients.
B. Yes, because each slave is effectively a connected user.
C. No, because slaves do not use the same type of connection as a regular client.
D. Yes, because if the server has too many connections, it may slow the slaves down.
Answer: B

MYSQL   006-002 examen   certification 006-002   certification 006-002

NO.5 Is it possible to tell the MySQL server to throw an error on division-by-zero rather than converting it to
NULL and a warning?
A. No, it has to be done programmatically.
B. Yes, by updating a system variable.
C. Yes, there is a SQL mode that exists for that.
D. No, division-by-zero is always converted regardless of any setting.
Answer: C

certification MYSQL   certification 006-002   006-002

NO.6 Consider the following:
mysql> EXPLAIN SELECT Name FROM Country WHERE Code = 'CAN'
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: Country
type: const
possible_keys: PRIMARY
key: PRIMARY
key_len: 3
ref: const
rows: 1
Extra:
Which of the following best describes the meaning of the value of the type column?
A. The table has exactly one row.
B. Several rows may be read from the table.
C. Only one row of all its rows need to be read.
Answer: C

MYSQL   certification 006-002   006-002 examen   006-002 examen

NO.7 The stored function year_to_date is created by the 'root'@'localhost' account as follows:
CREATE FUNCTION year_to_date ()
RETURNS DECIMAL(10,2)
SQL SECURITY DEFINER
BEGIN
...
END;
Within the routine body, a number of calculations are made on data in the financials table and the
calculated value is returned. The only account which can access the financials table is 'root'@'localhost'.
If a client connects with the account 'joe'@'localhost' and calls the year_to_date function, what will
happen?
A. The function will not execute, as 'joe'@'localhost' does not have access to the financials table
B. The function will not execute as SQL SECURITY DEFINER has been specified. It would execute if
instead SQL SECURITY INVOKER had been specified
C. The function will always execute as if it was 'root'@'localhost' that invoked it since SQL SECURITY
DEFINER has been specified.
D. If the account 'joe'@'localhost' has the EXECUTE privilege on year_to_date, the function will complete
successfully
Answer: D

MYSQL   006-002   006-002 examen   006-002   certification 006-002

NO.8 What kind of replication is supported by the MySQL server?
A. Multiple-master replication
B. Master to slave replication
C. Single file based clustering
D. MySQL doesn't support replication
Answer: B

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NO.9 The type of file system you chose may affect MySQL use and/or performance with regard to...
A. Table opening time.
B. Size limits of files.
C. Time to recover from a crash.
D. The number of users MySQL can handle.
E. The type of storage engines that can be used.
Answer: ABC

MYSQL   006-002   006-002 examen   006-002   006-002

NO.10 Which of the following best describes what the master.info file contains and how it is used?
A. It contains the values from the CHANGE MASTER statement.
B. When the slave restarts it looks for which master to use from this file.
C. It contains information about the master server, its slaves and its configuration.
D. It is used by an administrator to determine what slaves connect to the master, and other information
about the master server.
Answer: AB

MYSQL examen   006-002 examen   006-002 examen

NO.11 Which of the following are important network factors for remote MySQL clients?
A. Latency.
B. Firewalls.
C. Throughput speed.
D. The type of routers used.
Answer: AC

certification MYSQL   006-002   006-002   certification 006-002

NO.12 In regards to security, which of the following statements are true?
A. mysqld should not be run as root or administrator.
B. mysqld should be run as root or administrator.
C. The user owning the server process should own all files and directories to which the server may write.
D. The root or admininistrator users should own all files related to the server process
Answer: AC

MYSQL   006-002   006-002   006-002 examen   certification 006-002

NO.13 When performing diagnostic functions on a server should excessive start and stop messages be looked
for in the error log, and why?
A. No, start and stop messages are of no relevance to diagnostics.
B. Yes, because there is a bug in mysqld that can cause multiple start and stop messages to be inserted
in the log.
C. No, because they will not provide any information as to what is wrong.
D. Yes, because they can indicate that there is something causing the server to restart unexpectedly and
not due to normal startup and shutdown.
Answer: D

MYSQL   006-002   006-002

NO.14 Which of the following would be considered a good candidate table for compression?
A. A table with data that needs only few updates in the future.
B. A table with data that will not be updated in the future.
C. A large table, such as those used for data warehousing.
D. All MyISAM tables are good candidates for compression.
Answer: B

MYSQL   certification 006-002   006-002   006-002   006-002 examen

NO.15 The user 'joe' connecting from the host example.com has full access to all databases on the server:
mysql> SHOW GRANTS FOR 'joe'@'example.com';
+----------------------------------------------------+
| Grants for joe@example.com |
+----------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'joe'@'example.com' |
+----------------------------------------------------+
1 row in set (0.00 sec)
You need to restrict the user from accessing the mysql database. Will the following statement do this?
REVOKE ALL PRIVILEGES ON mysql.* FROM 'joe'@'example.com'
A. Yes
B. No
C. The answer cannot be determined from the information provided.
Answer: B

MYSQL examen   006-002   certification 006-002

NO.16 When working with replication, why might you want to stop the SQL thread on the slave while keeping
the I/O thread running?
A. So that no changes are made while making backups.
B. So that events for the slave do not get backlogged on the master.
C. So that remaining events can be processed while not receiving new events from the master.
Answer: AB

MYSQL   006-002 examen   006-002   006-002

NO.17 Which of the following statements are true regarding wildcards in the host name of an account
specification?
A. The '%' character is used to match any number of characters or numbers
B. The '*' character is used to match any number of characters or numbers
C. The '_' character is used to match any number of characters or numbers
D. The '.' character is used to match any single character or number
E. Wildcards may be used to match any number of characters at the beginning of the host name or IP
address only
F. Wildcards may be used to match any number of characters at the end of the host name or IP address
only
G. Wildcards may be used to match any number of characters anywhere in the host name or IP address
Answer: AG

MYSQL   certification 006-002   certification 006-002

NO.18 Which of the following best describes why InnoDB tables should always have primary keys and why
they should be short?
A. Because InnoDB uses primary keys to locate tables, and shorter keys make quicker lookups.
B. Because InnoDB uses primary keys to locate table rows, and shorter keys make quicker lookups.
C. Because InnoDB stores pointers in a log to all the primary keys and shorter keys make this log smaller.
Answer: B

MYSQL examen   006-002   certification 006-002   006-002 examen   006-002 examen

NO.19 Which of the following is/are valid reasons to consider using --skip-networking?
A. Your server is not networked to other servers.
B. You do not have a need for remote clients to connect.
C. You have a need for remote clients to connect.
D. You are not going to use replication or clustering.
Answer: B

MYSQL   006-002 examen   006-002   006-002 examen

NO.20 Which of the following best describe the effects on performance for the dynamic-row format for
MyISAM has?
A. Retrievals are more complex and slower.
B. Retrievals are less complex and are faster.
C. Rows generally take up less disk space than fixed-row format.
D. Rows generally take up more disk space than fixed-row format.
Answer: AC

MYSQL examen   certification 006-002   006-002   certification 006-002   006-002 examen

NO.21 What are reasons to prefer using GRANT and REVOKE statements over editing the privilege tables
directly?
A. Using GRANT and REVOKE allows the server to figure out the right tables and do all the appropriate
work
B. All grant tables in memory are immediately updated on GRANT and REVOKE
C. Making changes directly to the grant tables, one must remember to execute flush privileges to make
the changes take effect
D. GRANT and REVOKE statements allow you to do more fine-grained tuning of user privileges than
does editing the grant tables directly.
E. None of the above
Answer: ABC

MYSQL examen   006-002   006-002   006-002 examen   006-002

NO.22 For which of the following objects can privileges be specified?
A. Host
B. Global
C. Database
D. Table
E. Column
F. Row
Answer: BCDE

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NO.23 In the following query, the Population column is indexed:
mysql> EXPLAIN SELECT Name
-> FROM Country
-> WHERE Code LIKE '%B%' AND Population > 10000
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: Country
type: ALL
possible_keys: i_pop
key: NULL
key_len: NULL
ref: NULL
rows: 239
Extra: Using where
Which of the following best describes how to deal with the key value of the EXPLAIN output?
A. Use FORCE KEY
B. Use USE INDEX.
C. Use FORCE INDEX.
D. Use USE POSSIBLE_KEY
Answer: BC

MYSQL   certification 006-002   006-002

NO.24 Which of the following optimizations could be made based on data collected in the slow query log?
A. Tune server parameters.
B. Change the storage engines in use.
C. Make changes to the network infrastructure.
D. Rewrite queries to perform more efficiently.
E. Normalize data or add indexes to the tables that the queries use.
Answer: ABDE

MYSQL   006-002   006-002   006-002   006-002

NO.25 How can stored routines be used to check for constraints or legality of incoming data?
A. They can make use of the VALIDATE DEFINER setting.
B. They can not be used to check for constraints or legality of data.
C. They can check and only perform an action if the incoming values match a specified value.
Answer: C

MYSQL   certification 006-002   006-002   006-002   certification 006-002

NO.26 Which of the following statements are true regarding the structure of grant tables in new distributions?
A. They change with every upgrade.
B. They are often changed.
C. They remain the same for backwards compatibility.
Answer: B

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NO.27 Consider the following EXPLAIN output.
mysql> EXPLAIN SELECT Name FROM City WHERE Population > 8000000
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: City
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: 4079
Extra: Using where
Which of the following statements are true?
A. The query cannot be optimized any better.
B. No index could be used to perform the query.
C. All 4079 rows of the table need to examined.
D. The Name column should be indexed.
E. The Population column should be indexed.
Answer: BCE

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NO.28 What type of resource limitations may be placed on a user account with the GRANT statement?
A. The number of times per hour that an account is allowed to connect to the server
B. The number of queries per hour an account is allowed to issue
C. The number of updates per hour an account is allowed to issue
D. The maximum number of simultaneous connections an account can have
E. Resource limits can only be specified globally, not per-account
F. MySQL does not have provisions for limiting resource usage
Answer: ABCD

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NO.29 Assuming that the user account 'joe'@'example.com' exists, executing DROP USER
'joe'@'example.com' has the following consequences:
A. The user account will immediately be removed from the server, if no object-level privileges are in effect
for that account
B. The account will be removed from the server the next time FLUSH PRIVILEGES is executed, if no
object-level privileges are in effect for that account
C. The account and all associated privileges will immediately be removed from the server
D. The user account and all associated privileges will be removed from the server the next time FLUSH
PRIVILEGES is executed.
Answer: C

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NO.30 Which of the following statements best describe the key buffer?
A. It is a global buffer.
B. It is set on a per-connection basis.
C. It caches index blocks for MyISAM tables only.
D. It caches index blocks for InnoDB tables only.
E. It caches index blocks for all storage engine tables.
Answer: AC

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