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2014年3月20日星期四

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Code d'Examen: 1Z0-046
Nom d'Examen: Oracle (Oracle Database 10g: Managing Oracle on Linux for DBAs)
Questions et réponses: 120 Q&As

Code d'Examen: 1Z0-043
Nom d'Examen: Oracle (Oracle database 10g:Administration ii)
Questions et réponses: 186 Q&As

Code d'Examen: 1Z0-040
Nom d'Examen: Oracle (Oracle database 10g:new features for adminsitrators)
Questions et réponses: 200 Q&As

Code d'Examen: 1Z0-042
Nom d'Examen: Oracle (Oracle database 10g:Administration I)
Questions et réponses: 185 Q&As

Code d'Examen: 1Z0-051
Nom d'Examen: Oracle (Oracle Database: SQL Fundamentals I)
Questions et réponses: 292 Q&As

Code d'Examen: 1Z1-054
Nom d'Examen: Oracle (Oracle Database 11g: Performance Tuning)
Questions et réponses: 192 Q&As

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NO.1 View the Exhibit and examine the structure of the PRODUCTS table.
You need to generate a report in the following format:
CATEGORIES
5MP Digital Photo Camera's category is Photo
Y Box's category is Electronics
Envoy Ambassador's category is Hardware
Which two queries would give the required output? (Choose two.)
A. SELECT prod_name q'''s category is ' prod_category CATEGORIES
FROM products;
B. SELECT prod_name q'['s ]'category is ' prod_category CATEGORIES
FROM products;
C. SELECT prod_name q'\'s\' ' category is ' prod_category CATEGORIES
FROM products;
D. SELECT prod_name q'<'s >' 'category is ' prod_category CATEGORIES
FROM products;
Answer: CD

Oracle   1Z0-051   1Z0-051   1Z0-051

NO.2 Examine the structure of the PROMOTIONS table:
name Null Type
PROMO_ID NOT NULL NUMBER(6)
PROMO_NAME NOT NULL VARCHAR2(30)
PROMO_CATEGORY NOT NULL VARCHAR2(30)
PROMO_COST NOT NULL NUMBER(10,2)
The management wants to see a report of unique promotion costs in each promotion category.
Which query would achieve the required result?
A. SELECT DISTINCT promo_cost, promo_category FROM promotions;
B. SELECT promo_category, DISTINCT promo_cost FROM promotions;
C. SELECT DISTINCT promo_cost, DISTINCT promo_category FROM promotions;
D. SELECT DISTINCT promo_category, promo_cost FROM promotions ORDER BY 1;
Answer: D

Oracle   1Z0-051   certification 1Z0-051   1Z0-051 examen   1Z0-051   1Z0-051

NO.3 Which two statements are true regarding single row functions? (Choose two.)
A. They a ccept only a single argument.
B. They c an be nested only to two levels.
C. Arguments can only be column values or constants.
D. They a lways return a single result row for every row of a queried table.
E. They c an return a data type value different from the one that is referenced.
Answer: DE

Oracle   1Z0-051 examen   certification 1Z0-051   1Z0-051   1Z0-051 examen   1Z0-051

NO.4 You need to extract details of those products in the SALES table where the PROD_ID column
contains the string '_D123'.
Which WHERE clause could be used in the SELECT statement to get the required output?
A. WHERE prod_id LIKE '%_D123%' ESCAPE '_'
B. WHERE prod_id LIKE '%\_D123%' ESCAPE '\'
C. WHERE prod_id LIKE '%_D123%' ESCAPE '%_'
D. WHERE prod_id LIKE '%\_D123%' ESCAPE '\_'
Answer: B

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NO.5 View the Exhibit and examine the data in the CUSTOMERS table.
Evaluate the following query:
SQL> SELECT cust_name AS "NAME", cust_credit_limit/2 AS MIDPOINT,MIDPOINT+100 AS "MAX
LOWER LIMIT"
FROM customers;
The above query produces an error on execution.
What is the reason for the error?
A. An alias cannot be used in an expression.
B. The a lias NAME should not be enclosed with in double quotation marks .
C. The MIDPOINT+100 expression gives an error because CUST_CREDIT_LIMIT contains NULL
values.
D. The a lias MIDPOINT should be enclosed with in double quotation marks for the
CUST_CREDIT_LIMIT/2 expression .
Answer: A

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NO.6 Using the CUSTOMERS table, you need to generate a report that shows 50% of each credit
amount in each income level. The report should NOT show any repeated credit amounts in each income
level.
Which query would give the required result?
A. SELECT cust_income_level, DISTINCT cust_credit_limit * 0.50
AS "50% Credit Limit"
FROM customers;
B. SELECT DISTINCT cust_income_level, DISTINCT cust_credit_limit * 0.50
AS "50% Credit Limit"
FROM customers;
C. SELECT DISTINCT cust_income_level ' ' cust_credit_limit * 0.50
AS "50% Credit Limit"
FROM customers;
D. SELECT cust_income_level ' ' cust_credit_limit * 0.50 AS "50% Credit Limit"
FROM customers;
Answer: C

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NO.7 Which SQL statements would display the value 1890.55 as $1,890.55? (Choose three .)
A. SELECT TO_CHAR(1890.55,'$0G000D00')
FROM DUAL;
B. SELECT TO_CHAR(1890.55,'$9,999V99')
FROM DUAL;
C. SELECT TO_CHAR(1890.55,'$99,999D99')
FROM DUAL;
D. SELECT TO_CHAR(1890.55,'$99G999D00')
FROM DUAL;
E. SELECT TO_CHAR(1890.55,'$99G999D99')
FROM DUAL;
Answer: ADE

Oracle   1Z0-051 examen   1Z0-051   1Z0-051   1Z0-051

NO.8 View the Exhibit and examine the structure of the PRODUCTS table.
All products have a list price.
You issue the following command to display the total price of each product after a discount of 25% and a
tax of 15% are applied on it. Freight charges of $100 have to be applied to all the products.
SQL>SELECT prod_name, prod_list_price -(prod_list_price*(25/100))
+(prod_list_price -(prod_list_price*(25/100))*(15/100))+100
AS "TOTAL PRICE"
FROM products;
What would be the outcome if all the parenthese s are removed from the above statement?
A. It produces a syntax error.
B. The result remains unchanged.
C. The total price value would be lower than the correct value.
D. The total price value would be higher than the correct value.
Answer: B

Oracle   1Z0-051 examen   certification 1Z0-051   1Z0-051

NO.9 View the Exhibit; e xamine the structure of the PROMOTIONS table.
Each promotion has a duration of at least seven days .
Your manager has asked you to generate a report, which provides the weekly cost for each promotion
done to l date.
Which query would achieve the required result?
A. SELECT promo_name, promo_cost/promo_end_date-promo_begin_date/7
FROM promotions;
B. SELECT promo_name,(promo_cost/promo_end_date-promo_begin_date)/7
FROM promotions;
C. SELECT promo_name, promo_cost/(promo_end_date-promo_begin_date/7)
FROM promotions;
D. SELECT promo_name, promo_cost/((promo_end_date-promo_begin_date)/7)
FROM promotions;
Answer: D

Oracle   1Z0-051 examen   1Z0-051

NO.10 View the E xhibit and examine the data in the EMPLOYEES table.
You want to generate a report showing the total compensation paid to each employee to date.
You issue the following query:
SQL>SELECT ename ' joined on ' hiredate
', the total compensation paid is '
TO_CHAR(ROUND(ROUND(SYSDATE-hiredate)/365) * sal + comm)
"COMPENSATION UNTIL DATE"
FROM employees;
What is the outcome?
A. It generates an error because the alias is not valid.
B. It executes successfully and gives the correct output.
C. It executes successfully but does not give the correct output.
D. It generates an error because the usage of the ROUND function in the expression is not valid.
E. It generates an error because the concatenation operator can be used to combine only two items.
Answer: C

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NO.11 Evaluate the following query:
SELECT INTERVAL '300' MONTH,
INTERVAL '54-2' YEAR TO MONTH,
INTERVAL '11:12:10.1234567' HOUR TO SECOND
FROM dual;
What is the correct output of the above query?
A. +25-00 , +54-02, +00 11:12:10.123457
B. +00-300, +54-02, +00 11:12:10.123457
C. +25-00 , +00-650, +00 11:12:10.123457
D. +00-300 , +00-650, +00 11:12:10.123457
Answer: A

Oracle examen   certification 1Z0-051   certification 1Z0-051   1Z0-051   1Z0-051 examen

NO.12 View the Exhibit and examine the structure of the SALES, CUSTOMERS, PRODUCTS, and TIMES
tables.
The PROD_ID column is the foreign key in the SALES table, which references the PRODUCTS table.
Similarly, the CUST_ID and TIME_ID columns are also foreign keys in the SALES table referencing the
CUSTOMERS and TIMES tables, respectively.
Evaluate the following CREATE TABLE command:
CREATE TABLE new_sales(prod_id, cust_id, order_date DEFAULT SYSDATE)
AS
SELECT prod_id, cust_id, time_id
FROM sales;
Which statement is true regarding the above command?
A. The NEW_SALES table would not get created because the DEFAULT value cannot be specified in the
column definition.
B. The NEW_SALES table would get created and all the NOT NULL constraints defined on the specified
columns would be passed to the new table.
C. The NEW_SALES table would not get created because the column names in the CREATE TABLE
command and the SELECT clause do not match.
D. The NEW_SALES table would get created and all the FOREIGN KEY constraints defined on the
specified columns would be passed to the new table.
Answer: B

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NO.13 View the Exhibit to examine the description for the SALES table.
Which views can have all DML operations performed on it? (Choose all that apply.)
A. CREATE VIEW v3
AS SELECT * FROM SALES
WHERE cust_id = 2034
WITH CHECK OPTION;
B. CREATE VIEW v1
AS SELECT * FROM SALES
WHERE time_id <= SYSDATE - 2*365
WITH CHECK OPTION;
C. CREATE VIEW v2
AS SELECT prod_id, cust_id, time_id FROM SALES
WHERE time_id <= SYSDATE - 2*365
WITH CHECK OPTION;
D. CREATE VIEW v4
AS SELECT prod_id, cust_id, SUM(quantity_sold) FROM SALES
WHERE time_id <= SYSDATE - 2*365
GROUP BY prod_id, cust_id
WITH CHECK OPTION;
Answer: AB

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NO.14 Evaluate the following query:
SQL> SELECT promo_name q'{'s start date was }' promo_begin_date
AS "Promotion Launches"
FROM promotions;
What would be the outcome of the above query?
A. It produces an error because flower braces have been used.
B. It produces an error because the data types are not matching.
C. It executes successfully and introduces an 's at the end of each promo_name in the output.
D. It executes successfully and displays the literal " {'s start date was } " for each row in the output.
Answer: C

Oracle   1Z0-051 examen   certification 1Z0-051   1Z0-051 examen   1Z0-051

NO.15 Examine the structure of the SHIPMENTS table:
name Null Type
PO_ID NOT NULL NUMBER(3)
PO_DATE NOT NULL DATE
SHIPMENT_DATE NOT NULL DATE
SHIPMENT_MODE VARCHAR2(30)
SHIPMENT_COST NUMBER(8,2)
You want to generate a report that displays the PO_ID and the penalty amount to be paid if the
SHIPMENT_DATE is later than one month from the PO_DATE. The penalty is $20 per day.
Evaluate the following two queries:
SQL> SELECT po_id, CASE
WHEN MONTHS_BETWEEN (shipment_date,po_date)>1 THEN
TO_CHAR((shipment_date - po_date) * 20) ELSE 'No Penalty' END PENALTY
FROM shipments;
SQL>SELECT po_id, DECODE
(MONTHS_BETWEEN (po_date,shipment_date)>1,
TO_CHAR((shipment_date - po_date) * 20), 'No Penalty') PENALTY
FROM shipments;
Which statement is true regarding the above commands?
A. Both execute successfully and give correct results.
B. Only the first query executes successfully but gives a wrong result.
C. Only the first query executes successfully and gives the correct result.
D. Only the second query executes successfully but gives a wrong result.
E. Only the second query executes successfully and gives the correct result.
Answer: C

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NO.16 Which two statements are true regarding the USING and ON clauses in table joins? (Choose two.)
A. Both USING and ON clauses can be used for equijoins and nonequijoins.
B. A maximum of one pair of columns can be joined between two tables using the ON clause.
C. The ON clause can be used to join tables on columns that have different names but compatible data
types.
D. The WHERE clause can be used to apply additional conditions in SELECT statements containing the
ON or the USING clause.
Answer: CD

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NO.17 Which statement is true regarding the INTERSECT operator?
A. It ignores NULL values.
B. Reversing the order of the intersected tables alters the result.
C. The names of columns in all SELECT statements must be identical.
D. The number of columns and data types must be identical for all SELECT statements in the query.
Answer: D

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NO.18 You need to produce a report where each customer's credit limit has been incremented by $1000. In
the output, t he customer's last name should have the heading Name and the incremented credit limit
should be labeled New Credit Limit. The column headings should have only the first letter of each word in
uppercase .
Which statement would accomplish this requirement?
A. SELECT cust_last_name Name, cust_credit_limit + 1000
"New Credit Limit"
FROM customers;
B. SELECT cust_last_name AS Name, cust_credit_limit + 1000
AS New Credit Limit
FROM customers;
C. SELECT cust_last_name AS "Name", cust_credit_limit + 1000
AS "New Credit Limit"
FROM customers;
D. SELECT INITCAP(cust_last_name) "Name", cust_credit_limit + 1000
INITCAP("NEW CREDIT LIMIT")
FROM customers;
Answer: C

Oracle examen   1Z0-051   1Z0-051   1Z0-051

NO.19 View the Exhibit and examine the structure of the CUSTOMERS table.
Which two tasks would require subqueries or joins to be executed in a single statement? (Choose two.)
A. listing of customers who do not have a credit limit and were born before 1980
B. finding the number of customers, in each city, whose marital status is 'married'
C. finding the average credit limit of male customers residing in 'Tokyo' or 'Sydney'
D. listing of those customers whose credit limit is the same as the credit limit of customers residing in the
city 'Tokyo'
E. finding the number of customers, in each city, whose credit limit is more than the average credit limit of
all the customers
Answer: DE

Oracle examen   certification 1Z0-051   1Z0-051   certification 1Z0-051   1Z0-051   1Z0-051

NO.20 Which three statements are true regarding the data types in Oracle Database 10g/11g? (Choose
three.)
A. Only one LONG column can be used per table.
B. A TIMESTAMP data type column stores only time values with fractional seconds.
C. The BLOB data type column is used to store binary data in an operating system file.
D. The minimum column width that can be specified for a VARCHAR2 data type column is one.
E. The value for a CHAR data type column is blank-padded to the maximum defined column width.
Answer: ADE

Oracle examen   certification 1Z0-051   1Z0-051

2013年12月7日星期六

Oracle meilleur examen 1Z0-042, questions et réponses

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Code d'Examen: 1Z0-042
Nom d'Examen: Oracle (Oracle database 10g:Administration I)
Questions et réponses: 185 Q&As

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NO.1 Which two statements are true about the roles in the Oracle database? (Choose two.)
A. A role cannot be assigned external authentication.
B. Roles can be granted to other roles.
C. Roles are owned by the SYS user.
D. A role can be granted to itself.
E. A role can contain both system and object privileges.
Answer: BE

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NO.2 You have a text file that maintains information on thousands of items. The end-user application requires
the transfer of that information into a table in the database. What would you use to achieve this task?
(Choose two.)
A. Data Pump
B. SQL*Loader
C. External table
D. Oracle Text
E. Oracle Import
Answer: BC

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NO.3 Redo log files are not multiplexed in your database. Redo log blocks are corrupted in group 2, and
archiving has stopped. All the redo logs are filled and database activity is halted. Database writer has
written everything to disk. Which command would you execute to proceed further?
A. ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 2;
B. RECOVER LOGFILE BLOCK GROUP 2;
C. ALTER DATABASE CLEAR LOGFILE GROUP 2;
D. ALTER DATABASE DROP LOGFILE GROUP 2;
E. ALTER DATABASE RECOVER LOGFILE GROUP 2;
Answer: A

Oracle   1Z0-042   1Z0-042 examen   1Z0-042

NO.4 Examine the following commands executed in your database:
SQL> ALTER SESSION RECYCLEBIN=ON;
Session altered
SQL> CREATE TABLE emp TABLESPACE tbsfd AS SELECT * FROM hr.employees; Table created.
Further, you executed the following command to drop the table:
SQL> DROP TABLE emp;
Table dropped.
What happens in this scenario?
A. The table is moved to the SYSTEM tablespace.
B. The table is renamed and remains in the TBSFD tablespace.
C. The table is moved to the SYSAUX tablespace.
D. The table is removed from the database permanently.
Answer: B

Oracle   1Z0-042   certification 1Z0-042   1Z0-042   certification 1Z0-042

NO.5 You want to monitor and control the resource usage by sessions. You want to be warned automatically
when more than 100 sessions are opened with your database. What action would you take to achieve
this?
A. Set the warning threshold for the Current Logons Count metric.
B. Set the limits in the profiles used by users.
C. Use the Database Resource Manager.
D. Modify the SESSIONS initialization parameter.
Answer: A

Oracle examen   1Z0-042   1Z0-042

NO.6 Which statement regarding the contents of the V$PARAMETER view is true?
A. displays only the list of default values
B. displays the current contents of the server parameter file
C. displays the currently in effect parameter values
D. displays the list of all the parameter files of a database
E. displays only the list of all advanced parameters
F. displays only the list of all basic parameters
Answer: C

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NO.7 Which three statements are true regarding the fine-grained auditing (FGA)? (Choose three.)
A. FGA is possible on SELECT statements only.
B. The audit trail for FGA is stored in the AUD_LOG$ table.
C. FGA includes the SQL statement used by the user as part of the audit event entry.
D. FGA enables a SQL predicate to define when to audit an event.
E. The audit trail for FGA is stored in the FGA_LOG$ table.
F. FGA audits DELETE statements only when audit columns are specified.
Answer: CDE

Oracle examen   1Z0-042 examen   1Z0-042 examen

NO.8 You want to create a tablespace with the following specifications:
1. The tablespace extends automatically.
2. Used and free extents should be managed by bitmaps.
3. Default PCTUSED attribute is set to 60.
4. All the extents would be of size 1 MB.
Which three options would you choose to create the tablespace? (Choose three.)
A. tablespace with segment space management as automatic
B. tablespace with AUTOEXTEND enabled
C. tablespace with a uniform extent allocation of 1 MB
D. tablespace with dictionary-managed extents
E. tablespace with segment space management as manual
Answer: BCE

Oracle   certification 1Z0-042   1Z0-042   1Z0-042

NO.9 The user SCOTT executes the following command successfully to increase the salary values in one of
his sessions:
SQL> UPDATE emp SET sal=sal*1.15 WHERE deptno=20;
Before SCOTT ends the transaction, user HR who has the privileges on EMP table executes a query to
fetch the salary details but finds the old salary values instead of the increased values.
Why does HR still see the old data?
A. because of redo data from redo log file
B. because of data from a temporary tablespace
C. because of undo data from the undo tablespace
D. because of data from database buffer cache
Answer: C

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NO.10 The ST_INFO master table has millions of rows that are updated very rarely. It has a STATE_CODE
column that contains the value for 25 states. The table is frequently queried on the STATE_CODE column.
Which type of index would you suggest to improve the query performance?
A. bitmap
B. B-tree
C. function based
D. reverse key
Answer: A

Oracle   1Z0-042   1Z0-042   1Z0-042   certification 1Z0-042

NO.11 Which step do you need to perform to enable a user with the SYSDBA privilege to log in as SYSDBA in
iSQL*Plus.?
A. The user must be granted the database administrator (DBA) privilege.
B. Set up a user in the Oracle Application Server Containers for J2EE (OC4J) user manager, and grant
the webDba role to the user.
C. The user must be listed in the password file for the authentication.
D. No special setup is needed for the user to connect as SYSDBA in iSQL*Plus.
Answer: B

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NO.12 You executed the STARTUP MOUNT command to start your database. For which database operation
do you need to start the database in the MOUNT state?
A. dropping a user in your database
B. dropping a tablespace in your database
C. enabling or disabling redo log archiving
D. renaming the control files
E. re-creating the control files, after you lost all the control files in your database
Answer: C

Oracle   1Z0-042   1Z0-042   1Z0-042

NO.13 User Scott has updated the salary of one of the employees in the EMPLOYEES table and has not
committed the transaction. What are the two types of locks that this scenario would lead to? (Choose
two.)
A. a shareable table lock for the table containing the row
B. null lock on the table containing the row
C. exclusive table-level lock for the table containing the row
D. null lock on the row being updated
E. ROW SHARE lock for the row being updated
F. shared row-exclusive lock for the row being updated
G. ROW EXCLUSIVE lock for the row being updated
Answer: AG

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NO.14 You specified extent management as local for a tablespace. How will it affect space management in the
tablespace?
A. The tablespace will be system managed and the users cannot specify the extent size.
B. Free extents will be managed by the data dictionary tables.
C. All the extents will be of the same size.
D. Bitmap will be used to record free and allocated extents.
Answer: D

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NO.15 In your database, the snapshot interval is set to 10 minutes for the Automatic Workload Repository
(AWR). The database instance is running for the past 30 days.
View the Exhibit to examine the Automatic Database Diagnostic Monitor (ADDM) task.
The ADDM task is performed every 10 minutes, except the last task. What could be the reason for this?
A. The snapshot retention period for the AWR was increased before the last task.
B. The STATISTICS_LEVEL initialization parameter was changed to BASIC and reset to TYPICAL before
the last task.
C. The optimizer statistics was collected manually by using the DBMS_STATS package before the last
task.
D. The optimizer statistics for few objects in the database were locked before the last task.
Answer: B

Oracle   1Z0-042   1Z0-042   1Z0-042

NO.16 The employee IDs of employees who have made sales in the company are transferred from the
EMPLOYEES table to the BONUS table with a default bonus value. Later, the human resources
department decides to give bonuses to employees as per the following conditions:
1. Employees with a salary of $8,000 or less should receive a bonus.
2. Employees who have not made sales get a bonus of 1% of their salary.
3. Employees who already made sales get an increase in their bonus equal to 1% of their salary.
What would you do to implement these changes in one step?
A. Use SQL*Loader utility.
B. Use the MERGE statement.
C. Use a multitable insert operation.
D. Use a correlated UPDATE statement.
Answer: B

Oracle   1Z0-042 examen   1Z0-042   1Z0-042   1Z0-042

NO.17 View the Exhibit to see the source and target databases.
You have created a database link, devdb.us.oracle.com, between the databases PRODDB and DEVDB.
You want to import schema objects of the HR user using Oracle Data Pump from the
development database, DEVDB, to the production database, PRODDB. You execute the following
command on the target database server:
$impdp system/manager directory = DB_DATA
dumpfile = schemas.dat
schemas = hr
flashback_time = 2004-02-03 09:00
The command fails, displaying the following error:
ORA-39001: invalid argument value
ORA-39000: bad dump file specification
ORA-31640: unable to open dump file "/home/oracle/schema/schemas.dat" for read
ORA-27037: unable to obtain file status
What would you do to overcome the error?
A. remove the dumpfile option in the command
B. remove the flashback_time option in the command
C. remove the dumpfile option and add the network_link = devdb.us.oracle.com option in the command
D. add the user, SYSTEM, to the schemas option in the command
E. remove the schemas option and add the network_link = devdb.us.oracle.com option in the command
F. add network_link = devdb.us.oracle.com option in the command
Answer: C

Oracle   certification 1Z0-042   1Z0-042

NO.18 Your database instance is started using the server parameter file (SPFILE). Control files are
multiplexed and stored on different disks. Because of a disk failure, you lost one of these control files. You
replaced the damaged disk. What is the correct sequence of steps that you would follow to recover the
control file?
1. Shut down the instance, if not already done.
2. Copy one of the remaining control files to a new location.
3. Change the value of the CONTROL_FILES initialization parameter to correspond to the new location of
the control files.
4. Start up the database instance to the NOMOUNT stage.
5. Recover the database to the point of failure of the control file.
6. Open the database.
A. 2,4,3,4,5
B. 5,2,3,4
C. 4,5,6,2,3
D. 1,2,4,3,5
Answer: D

Oracle   certification 1Z0-042   1Z0-042   certification 1Z0-042   1Z0-042

NO.19 You plan to use static database registration for a new listener when you create it. What could be the
two reasons for this? (Choose two.)
A. The Oracle Enterprise Manager is to be used to monitor an Oracle9i database.
B. More than one database is to be registered with the listener.
C. The listener is not configured on the default port of 1521 and the instance is not configured to register
with a nondefault port.
D. The users will connect the database by using the host naming method.
E. The database that is to be registered with the listener is configured in shared server mode.
Answer: AC

Oracle   1Z0-042 examen   certification 1Z0-042   1Z0-042

NO.20 Which two operations require undo data? (Choose two.)
A. recovering from failed transactions
B. recording a transaction to redo log files
C. rolling back a transaction
D. committing a transaction
E. rolling forward during instance recovery
Answer: AC

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