1、Which three statements are true about the shared server architecture？

A) Shared server processes pull requests from the requests queue and process them.
B) Dispatchers return completed requests to the appropriate user processes.
C) Multiple user processes can be connected simultaneously to a single dispatcher process.
D) Multiple user processes can be connected simultaneously to a single shared server process.
E) Dispatchers processes pull requests from the requests queue and process them until they are complete.
F) Multiple dispatchers can connect to a single server process.

答案：ABC

2、View the Exhibit describing attributes of tablespace USERS and tables segments allocated in USERS.

Which three statements are true?
A) Segments in USERs have free space tracked with free lists.
B) Segments in USERs have free space tracked with BitMap Blocks(BMBs).
C) Free extent sizes will be in multiples of 64 K.
D) Free extent sizes will all be 64 K.
E) Allocated extent sizes will be in multiples of 64 K.
F) Allocated extent sizes will all be 64 K.

答案：BCE

3、You successfully executed these commands
CONNECT system/oracle@prod1
CREATE PUBLIC DATABASE LINK db_prod2
USING 'prod2'
Which two are true about the database link that is created?
A) it is a public fixed user database link
B) it is a public current user database link
C) Using db link db_prod2 might return errors to some users logged Into prod1 who attempt to access remote objects using the db link
D) it is a public connected user database link
E) The system user must have the password oracle in prod1
F) Using db link db_prod2 will never return errors to users logged into prod1 who attempt to access remote objects using the db link.

答案:CD

4、A database user SMITH tries to query the v$session view and falls to access it at follow
SQL> connect smith/smith
Connected
SQL> SELECT * FROM v$session;
Select * from v$session
ERROR at line 1:
ORA-00942: table or view does not exist

Which solution will enable smith to query the data in v$session?
A) Granting select privilege to smith on v$session
B) Setting the 07_DICMIONARY_ACCESSIBILINY parameter to true
C) Granting select privilege to smith on v$session
D) Asking the user smith to run the catalog.sql script

答案：B

5、which statement is true regarding the status of the incident?

A) the dba is working on the incident and prefers that the incident be kept in the ADR.
B) the incident is now in the done state and the ADR can select the incident to be purged
C) the incident has been newly created and is in the process of collecting diagnostic information
D) the data collection for the incident is complete and the incident can be packaged and set to oracle support.

答案：D

6、 in one of your databases,both shared server and the large pool are configured.
Which two statements are true about the allocation of PGA components for sessions using shared servers?
A) Each such session’s UGA is stored in the PGA of the shared server process being used by that session.
B) Each such session’s call stack and cursor state metadata are stored in the large pool.
C) Each such session’s cursor state metadata is stored in the PGA of the shared server process being used by that session.
D) Each such session’s private SQL work area is stored in the large pool
E) Each such session’s call stack is stored in the PGA of the shared server process being used by that session.
F) Each such session’s entire PGA is stored in the large pool.

答案：BF

7、you want to create a role to meet these requirement
1.the role is to be protected from unauthorized usage
2.the password of the role is not to be embedded in the application source code stored in a table
Which method would you use to restrict enabling of such roles?
A) Create the role with external authentication
B) Create the role as a password-protected role
C) Create a role and use Fine-grained Access Control(FGAC) to secure the role.
D) Create the role as a secure application role.

答案：D

8、You receive complaints from users regarding the high waiting time for their transactions. On
investigation, you find that some users are not committing their transactions though they are not
performing any activity for a long time. As a result, SQL statements need to wait for row-level locks.
Which two actions could you take to prevent this locking problem in the future? (Choose two.)
A.Decrease the IDLE_TIME resource limit in the profile assigned to the blocking users.
B.Use Database Resource Manager to automatically log out sessions that block others and are idle.
C.Set the limit in the profile of blocking users to control the number of blocks to be accessed in a session.
D.Decrease the maximum number of interested transaction list (ITL) slots for the segments on which the blocking user performs the transaction.

Answer: AB

9、Which two statements describe good practices for an application developer to reduce locking
conflicts in Oracle database? (Choose two.)
A.Avoid coding unnecessary long-running transactions.
B.Allow the database to handle locks in default locking mode.
C.Always explicitly code the locks as per the requirement of the application.
D.Allow escalation of row locks to block locks if too many row locks cause problem.

Answer: AB

10、User SCOTT executes the following command on the EMP table but has not issued COMMIT,
ROLLBACK, or any data definition language (DDL) command:
SQL> SELECT ename FROM emp
2 WHERE job='CLERK' FOR UPDATE OF empno;
SCOTT has opened another session to work with the database instance. Which three operations
would wait when issued in SCOTT's second session? (Choose three.)
A.LOCK TABLE emp IN SHARE MODE;
B.LOCK TABLE emp IN EXCLUSIVE MODE;
C.UPDATE emp SET sal=sal*1.2 WHERE job=MANAGER;
D.INSERT INTO emp(empno,ename) VALUES (1289,'Harry');
E.SELECT ename FROM emp WHERE job='CLERK' FOR UPDATE OF empno;

Answer: ABE

11、You suspect unauthorized data manipulation language (DML) operations on a particular table.
You want to track users who are performing the transactions and the values used in the
transactions. You also plan to transfer these values to another table for analysis.
How would you achieve this?
A.by using triggers
B.by using Data Pump
C.by using external tables
D.by using anonymous PL/SQL blocks

Answer: A

12、You are working on a database that must be functioning 24 hours a day, 7 days a week. The
database is configured in ARCHIVELOG mode.
Which two options do you have for performing user-managed backups? (Choose two.)
A.You can perform consistent backups only.
B.You can perform a complete database backup without shutting down the database instance.
C.You can back up data files only when all data files have the same SCN recorded in the control file.
D.You can back up only those data files whose headers are frozen by using ALTER TABLESPACE
BEGIN BACKUP or ALTER DATABASE BEGIN BACKUP commands.

Answer: BD

13、Which two statements are true about setting the FAST_START_MTTR_TARGET initialization
parameter to a nonzero value? (Choose two.)
A.The MTTR advisor will be disabled.
B.Automatic checkpoint tuning will be enabled.
C.The value for the LOG_CHECKPOINT_INTERVAL initialization parameter will be override the value for FAST_START_MTTR_TARGET.
D.The time taken to recover the instance after the crash is always exactly the same as the value given for
the FAST_START_MTTR_TARGET initialization parameter.

Answer: BC

19、You are creating a locally managed tablespace to meet the following requirements:
All the extents should be of the same size.
The data should be spread across two data files.
A bitmap should be used to record the free space within the allocated extents.
Which three options would you choose? (Choose three.)

A. set PCTFREE and PCTUSED to 50

B. specify extent allocation as Uniform

C. specify extent allocation as Automatic

D. create the tablespace as bigfile tablespace

E. create the tablespace as smallfile tablespace

F. set segment space management to Automatic

G. use the RESIZE clause while creating the tablespace

答案：BEF

20、【需要注意：考试中此题变题，无第一步INSERT INTO 的COMMIT，选择的结果就不一样，需要考生们注意。】

Examine these commands and their output:
SQL> SELECT * FROM emp
ENO ENAME
--- -------
100 Adam
101 Alan
SQL> INSERT INTO emp VALUES(102,'Ben');
1 row created.
SQL>COMMIT;
Commit completed.
SQL>UPDATE emp SET ename='Bryan' WHERE eno=102;
1 row updated.
A power failure occurs. The instance is restarted and this query is executed.
SQL>SELECT ename FROM emp;
What is the outcome?

A Only Adam and Alan are displayed.

B No rows are returned.

C Only Adam, Alan, and Bryan are displayed.

D Adam, Alan, Ben, and Bryan are displayed.

E Only Adam, Alan, and Ben are displayed.

答案：E

21、Which three are true about Optimizer Statistics?

A They can be gathered manually

B They are automatically updated by DML statements

C They contain the execution plan for each executed SQL statement.

D They include the number of rows in a table and the number of distinct values per column.

E They can be gathered automatically by an automatic maintenance job.

答案：ADE

22、 Which three structures can span multiple data files？

A.migrated rows

B.table extents

C.temporary segment extents

D.index extents

E.chained rows

F.segments

答案：AEF

23、Which four database objects never have any segments？

A.A partitioned index

B.A view selecting from a populated table

C.An empty index

D.An Oracle Loader type external table

E.An empty table

F.A view selecting from an empty table

G.An Oracle Data Pump type external table

答案：BDFG

24、Which two are true about the Inventory directory?

A.It is shared by all Oracle software installations on a single server.

B.It is required only for Oracle Grid Infrastructure and Oracle Database software Installations.

C.It can be created only if the ORACLE_BASE environment variable is set.

D.It should be created before installing Oracle software for the first time on a server.

E.It is owned by the oinstall group, which must be created before installing Oracle software for the first time on a server.

答案：AD

25、Which two are true about Oracle Data Pump in Oracle Database 11g Release 2?

A.If the directory used in the export operation has existing dump files, it overwrites them.

B.It allows encryption to be performed without using a password.

C.It supports the export of specific views as tables.

D.It allows compression levels to be defined for the export.

E.It supports the renaming of tables during import.

答案：AE

26、Which two are true about external tables?

A.They can be stored in an ASM Cluster File System(ACFS).

B.They can always be updated using SQL.

C.They support the ORACLE_DATAPUMP access driver.

D.They have extents.

E.They support all DML operations.

答案：AC

27、 Examine this command:
SQL> CREATE GLOBAL TEMPORARY TABLE report_work_area
(startdate DATE,
enddate DATE, class CHAR(20))
ON COMMIT PRESERVE ROWS;
Which three statements are true about rows inserted into REPORT_WORK_AREA?

A.Rows will be lost if a ROLLBACK is done.

B.Rows will be lost upon session failure.

C.Rows are visible to all sessions logged in by the same user until the session that inserted the rows terminates.

D.Rows are visible to all sessions logged in by all users granted the DBA role until the session that inserted the rows terminates.

E.Rows will be lost upon session normal termination.

F.Rows are visible globally to all sessions logged in by any user until the session that inserted the rows terminates.

答案：ABE

28、Which three are true about the Automatic Database Diagnostic Monitor (ADDM)?

A.It improves database performance by automatically implementing Oracle ‘s best practices.

B.It can assist the DBA in diagnosing database instance startup failures.

C.It can be used by executing the PL/SQL procedures in the DBMS_ADDM package.

D.It runs automatically after each Automatic Workload Repository snapshot is created.

E.It provides recommendations to improve database performance.

F.Its findings are accessible only by using Oracle Enterprise Manager.

答案：CDE

29、 Your DB_RECOVERY_FILE_DEST_SIZE IS 8G,
Currently， 5G of the space is used of which 4G consists of obsolete backups,
You execute this command;
SQL> ALTER SYSTEM SET db_recovery_file_dest_size=2G;
What is the outcome?

A.It changes DB_RECOVERY_FILE_DEST_SIZE to 2G and deletes the obsolete backups

B.It changes DB_RECOVERY_FILE_DEST_SIZE to 5G

C.It fails because DB_RECOVERY_FILE_DEST_SIZE is a static parameter

D.It changes DB_RECOVERY_FILE_DEST_SIZE to 2G without deleting valid backups

E.It fails because the new size is less than 5G

答案：D

30、 【这道题我觉得B也可以】

In one of your databases:
1. USER1 and USER2 have no system privileges.
2. ROLE1 only has these privileges:
• CREATE SESSION
• CREATE TABLE
• CREATE VIEW
Examine these commands:
SQL> conn / as sysdba
Connected.
SQL> GRANT create table, role1 TO user1 WITH ADMIN OPTION;
Grant succeeded.
SQL> conn user1/oracle_4U
Connected.
SQL> GRANT role1 TO user2;
Grant succeeded.
Which command would you execute and as which user, to revoke the create table privilege from USER2?

A.REVOKE CREATE TABLE FROM user2 as SYS

B.REVOKE CREATE TABLE FROM role1 as SYS

C.REVOKE CREATE TABLE FROM role1 as USER1

D.REVOKE CREATE TABLE FROM user1 as SYS

答案：C

31、You have decided to implement the principle of least privilege and separation of duties.
Which two actions must you take?

A Grant SYSOPER to application schema owners.

B Grant access to the Oracle software owner O/S account to all database administrators.

C Assign the OSOPER and OSDBA groups to the Oracle software owner O/S account.

D Assign different O/S groups to the OSOPER and OSDBA credentials.

E Assign the DBA role to application schema owners.

答案：CD

32、Examine these SQL statements and their output:
SQL> select name,value
2 from v$parameter
3 where name like 'undo%';
NAME VALUE
-------------------- ----------------
undo_management AUTO
undo_tablespace UNDO
undo_retention 900
SQL> select contents,retention
2 from dba_tablespaces
3 where tablespace_name='UNDO';
CONTENTS RETENTION
-------------- --------------------
UNDO NOGUARANTEE
SQL> select blocks,autoextensible,maxblocks
2 from dba_data_files
3 Where tablespace_name='UNDO';
BLOCKS AUT MAXBLOCKS
------------- ----- ----------
6400 YES 64000
Which two are true?

A Inactive UNDO will be retained as long as possible within the limits of the current size of the UNDO tablespace.

B The UNDO tablespace can grow automatically if there is not enough space to retain active UNDO.

C Active UNDO will be retained as long as needed by transactions.

D Inactive UNDO will never be retained for more than 15 minutes.

E Inactive UNDO will always be retained for at least 15 minutes.

答案：BC

33、Which three are true about UNDO data?

A It is used to rewind a database by using FLASHBACK DATABASE.

B It is used to recover dropped tables by using FLASHBACK TABLE … TO BEFORE DROP.

C It is used to enable ROLLBACK statements to roll back uncommitted updates.

D It is used to roll back failed transactions.

E It is used during online backups to guarantee their consistency.

F It is used to provide read consistency.

答案：CDF

34、which three statements are true about initialization parameters and files?

A An idle instance must start with a PFILE.

B Session modifiable initialization parameters can only be changed by a user with the DBA role.

C The ALTER SYSTEM command can be used to change parameter values for an instance started using a PFILE.

D An SPFILE can be created from an idle instance.

E Session modifiable initialization parameters can only be changed once per session.

F The ALTER SYSTEM command can be used to change parameter values for an instance started using an SPFILE

G System modifiable initialization parameters can only be changed by the SYS user.

答案：CDF

35、Which four statements are true about tablespace space management?

A ASSM prevents row chaining.

B Locally managed tablespaces track adjacent free space using bitmaps.

C Locally managed tablespaces can manage segments with automatic segment space management(ASSM).

D Locally managed tablespaces track adjacent allocated space using bitmaps.

E ASSM prevents row migration.

F Locally managed tablespaces can manage segments with freelists

G Bigfile tablespaces can be dictionary or locally managed.

答案：BCDF   【这道题没有去理解，只根据选项开头都是Locally 这个规律选择答案】

36、Your database is configured in archivelog mode.
The USERS01 tablespace is currently online.
You are required to take the tablespace offline.
Which clause or clauses ensure that no media recovery is required when the tablespace is brought back online?

A.either the NORMAL or the TEMPORARY clause

B.only the TEMPORARY clause

C.only the NORMAL clause

D.either the NORMAL or the IMMEDIATE clause

E.only the IMMEDIATE clause.

答案：C

37、which two statements are true about tablespaces?

A. A database can contain multiple undo tablespaces.

B. A database instance stores undo data in the SYSTEM tablespace if no undo tablespace exists.

C. A database instance hangs if the SYSAUX tablespace becomes unavailable.

D. A database can contain only a single temporary tablespace.

E. A database with a locally managed SYSTEM tablespace can have dictionary-managed user tablespaces.

答案：AB

38、Which is true about the SYSTEM and SYSAUX tablespaces？

A Both tablespaces must be online for a database to be accessible .

B The SYSAUX tablespace can be made read-only but the SYSTEM tablespace can not.

C Only the SYSTEM tablespace contains data dictionary tables.

D Both tablespaces can be used for temporary storage if no temporary tablespace is defined.

答案：C

39、You executed these commands:
SQL> SHOW PARAMETER BACKGROUND_DUMP_DEST
NAME TYPE VALUE
 ——————————————————————————-
background_dump_dest string /u01/app/oracle/diag/rdbms/orcl/orcl/trace
SQL> SHOW PARAMETER DIAGNOSTIC_DEST
NAME TYPE VALUE
 ——————————————————————————-
diagnostic_dest string /u01/app/oracle
in which two locations and in which format is the alert log stored?

A as a text file in /u01/app/oracle/diag/rdbms/orcl/orcl/alert.

B  as a text file in /u01/app/oracle.

C as an HTML file in /u01/app/oracle.

D as an XML file in /u01/app/oracle

E as an HTML file in /u01/app/oracle/diag/rdbms/orcl/orcl/alert

F as an XML file in /u01/app/oracle/diag/rdbms/orcl/orcl/alert

答案：AF【有同学说这题答案应该为BF】

40、You are planning a softwore installation for both Oracle Database 11g Release 1 and Release 2.You plan to have at least one database for each release managed by Grid Infrastructure for a Standalone Server.
Which three are true in this scenario?

A.Both Oracle versions and Infrastructure can be owned by the same O/S account.

B.Oracle 11g Release 1 databases must be managed by Grid infrastructure 11g Release1.

C.Both Oracle versions and Infrastructure can be installed under the same ORACLE_BASE.

D.Both databases can be managed by Grid Infrastructure 11g Release 2.

E.Grid Infrastructure must be installed before both Oracle Database versions.

F.Each version of database may be managed by a separate version of Grid Infrastructure.

答案：CEF

41、Which four are true about server-generated alerts?

A.By default, a server-generated alert is raised for each tablespace that has 85% or more of its space used.

B.Server generated alerts for tablespace space usage occur only if the tablespace can no longer be automatically extended.

C.By default, a server-generated alert is raised for each tablespace that has 97% or more of its space used.

D.Stateless alerts can be seen by querying DBA_OUTSTANDING_ALERTS.

E.Stateful alerts that have not been cleared can be seen by querying DBA_ALERT_HISTORY.

F.Stateful alerts that have been cleared can be seen by querying DBA_ALERT_HISTORY.

答案：ABCF

42、Which three are true about Oracle database security ?

A.By default,SYSDBA connections have access to all schema objects.

B.By default , SYSOPER connections have access to the data dictionary.

C.SYSDBA connections are always subject to mandatory auditing.

D.Fine Grained Auditing can be used to restrict access to sensitive date.

E.SYSOPER connections are always sbuject to mandatory auditing.

F.Mandatory auditing is enabled by setting AUDIT_SYS_OPERATIONS toTRUE.

答案：ACE

43、The ORCL database has this configuration：
1. CONTROL FILE AUTOBACKUP and BACKUP OPTIMIZATION enabled.
2. TBS1 and TBS2 are the only administrator defined tablespaces.
3. TBS1 contains table USER1.EMP.
Examine these commands:
$ rman target /
RMAN> BACKUP INCREMENTAL LEVEL 0 DATABASE;
RMAN> exit
$ sqlplus / as sysdba
SQL> UPDATE user1.emp SET sal=10000 WHERE eno=l;
1 row updated
SQL> COMMIT;
Commit complete.
SQL> ALTER TABLESPACE tbsl READ ONLY;
SQL> exit
$ rman target /
RMAN> BACKUP INCREMENTAL LEVEL 1 DATABASE；
From which files are modified blocks backed up by the level 0 backup?

A.SYSTEM and SYSAUX only

B.SYSTEM, SYSAUX, UNDO, TEMP, TBS1, and TBS2

C.SYSTEM, SYSAUX, UNDO, and TBS2 only

D.SYSTEM, SYSAUX, and UNDO only

E.SYSTEM, SYSAUX, UNDO, and TBS1 only

答案：B

44、In which two cases are inconsistent database backup created?

A.when the RMAN BACKUP command is used while the database is OPEN READ ONLY

B.when the RMAN BACKUP PROXY command is used while the database is MOUNTED

C.when the RMAN BACKUP command is used while the database is OPEN READ WRITE

D.when the RMAN BACKUP command is used while the database is MOUNTED

E.when the RMAN BACKUP AS COPY command is used while the database is MOUNTED

答案：AC

45、A database instance was terminated due to the loss of the CURRENT online redo log group
and has not been restarted.
You wish to restore database availability by using the Data Recovery Advisor.
Examine this list of RMAN commands;
1. Startup
2. List failure all;
3. Advise failure all;
4. Repair failure noprompt;
5. Alter database open;
What are the minimum commands required and in what order must they be executed to achieve this?

A.1,2,3,and 4

B.1,3,and 4

C.1 and 4

D.1,3,4,and 5

E.1,2,3,4,and 5

答案：B

46、Which action is automatically performed as part of the Incident Packaging Service in
Enterprise Manager Support Workbench ?

A.gathering metadata from the Automatic Diagnostic Repository(ADR)

B.invoking the Data Recovery Advisor and SQL RepairAdvisor

C.creating a service request with My Oracle Support

D.invoking the SQL Test Case Builder

答案：A

47、 Examine this list of Database structures:
1. Tablespaces
2. Data files
3. Segments
4. Extents5. Oracle data blocks
6. OS blocks
Which three are true regarding these?

A.A segment with multiple extents can have space in different data files.

B.Segments always consist of more than one extent.

C.Extents always consist of Oracle data blocks.

D.A tablespace can have data files on different file systems.

E.A segment with multiple extents can have space in different tablespaces.

F.Tablespaces always contain multiple segments.

G.Oracle database blocks always consist of multiple OS blocks

答案：ACD

48、One of your databases is open and there are currently some uncommitted transactions.
You execute these commands successfully:
SHUTDOWN ABORT
STARTUP
Which two are true about the effects of these commands?

A.Instance recovery occurs before the database Is opened read write.

B.Media recovery occurs and the database is left in mount state.

C.Instance recovery occurs before the database is opened read only

D.The uncommitted transactions are rolled back during startup

E.Media recovery occurs before the database Is opened read write

F.The uncommitted transactions are rolled back before the Instance Is shut down

答案：AD

49、Which two types of entries are contained in Oracle Database trace files？

A.application code bug related entries

B.Database instance turning related entries

C.SQL statement turning related entries

D.Diagnostics related entries for server process

E.DDL action logs

答案：BD

50、View the Exhibit and examine the commands used to create two tables.
You wish to insert data into the child table before parent table.
Which two actions would avoid errors when inserting a row into the child table?

A.Disable the primary key constraint before starting the transaction

B.Disable the foreign key constraint before starting the transaction

C.Set the foreign key constraint to deferred before starting the transaction

D.Set the primary key constraint to deferred before starting the transaction

E.Set the foreign key to immediate and non deferrable

答案：BC

51、Which three statements are true about temporary tables?

A.DML on temporary tables may be rolled back

B.Their rows are always lost when a transaction commits

C.Their rows are not lost when a session fails

D.Their rows are always lost when a session logs out

E.Temporary tables are always created in a user's temporary tablespace

F.Their rows are never lost when a transaction commits

答案：ADE

52、In which two cases do file checkpoints guarantee that all dirty blocks for a tablespace
are written to the

A.when the sYsAuX tablespace is taken offline immediate

B.when a user tablespace is taken offline temporary

C.when a user tablespace is taken offline normal

D.when the sYsAux tablespace is taken offline norm

E.when a user tablespace is taken offline immediate

F.when the sYsAuX tablespace is taken offline temporary

答案：CD

53、Which four can be configured with profiles?

A.Maximum Logical Reads per Session

B.Maximum Logical Reads per Call

C.A Password Verify Function

D.Maximum Idle Time only when blocking another session

E.Maximum Idle Time only when not blocking another session

F.Maximum Failed Login Attempts

G.Maximum Physical Reads per Session

答案：ABCF

54、A database instance is in MouNT state You wish to delete the database using the Database
Configuration Assistant (DBCA)，Which three are true？

A.DBCA is able to delete the data files but not the services

B.DBCA starts up the instance if not already started

C.DBCA deletes the database's data files

D.DBCA deletes the database,s services

E.DBCA deletes all the databases archivelogs

F.DBCA shuts down the database instance

答案：BCD

55、Examine this query and its output
SQL> select sid, event, blocking session
2 from aSsession
where blocking session is not null;
SID VENT BLOCKING SESSION
-----------------------------------------------------------------
105 eng: Tx- row lock contention 15
Which two are true?

A.Session 15 has updated one row only and session 105 is stuck waiting to update or delete that row

B.Session 15 has updated one or more rows and session 105 is stuck waiting to update or delete one of those rows

C.Session 105 has not updated any rows successfully and is waiting on a row lock owned by session 15

D.Session 105 may have updated some rows but is waiting on a row lock owned by session 15

E.Session 15 can only block one session

答案：BD

56、Which three are true about lock ownership and contention in an Oracle database server?

A.A transaction can hold many row locks on rows in the same table at the same time.

B.A transaction can hold many row locks on rows in different tables at the same time.

C.A transaction can wait on many row locks on rows from the same table at the same time.

D.A transaction can hold many table locks at the same time.

E.Using the DBMS_LOCK package is more efficient than having the Oracle server's default locking occur.

F.A transaction can wait on many table locks at the same time.

G.A transaction can wait on many row locks on rows from different tables at the same time.

答案：ABG

57、Which four are true about the performance if DML statements on very large tables with bitmapped indexes?

A.Multiple bitmap indexes on different columns of the same table degrade query performance.

B.Bitmaps can be ANDed memory when filtering on multiple values in the same table column.

C.Queries filtering on numeric keys may improve performance compared to using conventional B*tree indexes.

D.Update statements perform as well as they do when using conventional B*tree indexes.

E.DML performance is degraded because individual rows cannot be locked in the index.

F.Querying rows whose keys are null can use the index and this may improve performance compared to using convention

G.Insert statements perform as well as they do when using conventional B*tree indexes.

答案：BCEF

58、User HR executes this statement:
CREATE OR REPLACE PROCEDURE create_ dept
( v_ deptno NUMBER,
v_dname VARCHAR2,
v_ mgr NUMBER, v_
loc NUMBER)
BEGIN
INSERT INTO departments
VALUES (v_ deptno, v_ dname, v_ mgr, v_ loc);
END;
Only 10 of 100 users can execute CREATE_DEPT successfully but they have no INSERT
privilege on HR . DEPARTMENTS.
Which two are definitely true?

A. The CREATE_ DEPT procedure has definer's rights.

B. The 90 users unable to execute the procedure must be granted the DBA role to execute it.

C. The DEPARTMENTS table belongs to HR.

D. The 10 users able to execute the procedure have been granted EXECUTE privilege on CREATE_ DEPT.

E. The CREATE_ DEPT procedure has invoker's rights.

F. The 10 users able to execute the procedure have been granted EXECUTE ANY PROCEDURE privilege.

答案：AD