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31. Which two statements are true regarding the database in ARCHIVELOG mode？ （Choose two.） A） You have to shut down the database to perform the backups. B） Archiving information is written to the data files and redo log files. C） You can perform complete database backups without closing the database. D） Online redo log files have to be multiplexed before putting the database in ARCHIVELOG mode. E） All the previous database backups become invalid after you configure the database to ARCHIVELOG mode. 答案：C E.32.  You perform differential incremental level 1 backups of your database on each working day and level 0 backup on Sundays. Which two statements are true about the differential incremental backups？ （Choose two.） A） The backup performed on Sundays contains all the blocks that have ever been use in the database. B） The backup performed on Sundays contains all the blocks that have changed since the last level 1 backup. C） The backup performed on each working day contains all the blocks that have changed since the last level 0 or level 1 backup. D） The backup performed on each working day contains all the blocks that have changed since the last level 0 backup. 答案： A C 33.  You require the Oracle server to manage the undo segments and space among various active sessions automatically. You created an undo tablespace, UNDO_TBS1, in your database. Which two additional steps would you perform to achieve this？ （Choose two.） A） Set the UNDO_RETENTION parameter to 900 or more. B） Create an initial undo segment in the undo tablespace. C） Enable the retention guarantee for the undo tablespace. D） Set the UNDO_TABLESPACE parameter to UNDO_TBS1. E） Set the UNDO_MANAGEMENT initialization parameter to AUTO. 答案：DE Oracle undo 管理 http://www.linuxidc.com/Linux/2011-09/42706.htm34. Which two statements are true regarding a PL/SQL package body？ （Choose two.） A） It cannot be created without a package specification. B） It cannot invoke subprograms defined in other packages. C） It can contain only the subprograms defined in the package specification. D） It can be changed and recompiled without making the package specification invalid. 答案：AD35. User A executes the following command to update the TRANS table） SQL> UPDATE B.trans SET tr_amt=tr_amt+500 WHERE c_code="C005"; Before user A issues a COMMIT or ROLLBACK command, user B executes the following command on the TRANS table: SQl> ALTER TABLE trans MODIFY （tr_type VARCHAR2 （3））; What would happen in this scenario？ A） The transaction for user A is rolled back. B） The ALTER TABLE command modifies the column successfully. C） The ALTER TABLE command fails due to the resource being busy. D） The ALTER TABLE command waits until user A ends the transaction. 答案：C36. 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 FGA_LOG$ table. C） The audit trail for FGA is stored in the AUD_LOG$ table. D） FGA enables a SQL predicate to define when to audit an event. E） FGA audits DELETE statements only when audit columns are specified. F） FGA includes the SQL statement used by the user as part of the audit event entry. 答案：B D F理解的也不是很透彻，参考 About Fine-Grained Auditing 小节：http://download.oracle.com/docs/cd/E11882_01/network.112/e10574/auditing.htm#DBSEG6068137. 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） The user must be listed in the password file for the authentication. C） No special setup is needed for the user to connect as SYSDBA in iSQL*Plus. D） Set up a user in the Oracle Application Server Containers for J2EE （OC4J） user manager, and grant the webDba role to the user. 答案：D38. In your Oracle 10g database, you have scheduled a job to update the optimizer statistics at 05） 00 pm every Friday. The job has successfully completed. Which three pieces of information would you check to confirm that the statistics have been collected？ （Choose three.） A） average row size B） last analyzed date C） size of table in bytes D） size of table in database blocks E） number of free blocks in the free list F） number of extents present in the table 答案：ABDhttp://download.oracle.com/docs/cd/E11882_01/server.112/e10821/stats.htm#PFGRF9471216.5.1 Verifying Optimizer Statisticshttp://download.oracle.com/docs/cd/E11882_01/server.112/e10821/sql_overview.htm#PFGRF9481539. Your database is open and users are connected using the LISTENER listener. The new DBA of the system stops the listener by using the following command: LSNRCTL> STOP What would happen to the sessions that are presently connected to the database instance？ A） The sessions are able to perform only queries. B） The sessions are not affected and continue to function normally. C） The active transactions are rolled back and the sessions get terminated. D） The sessions are not allowed to perform any operations till the listener is started.  答案：B40. After being hired as a database administrator, you find that there is only one database that is functional and that is being accessed by the applications. You want to create a replica of the database, to be used for testing purposes. What is the best method to create the replica？ A） create a database by using CREATE DATABASE .. command and manually copy the data B） use Database Configuration Assistant （DBCA） to create a template from the existing database to contain the database structure C） use DBCA to create a template from the existing database to contain the database structure and then manually copy the data using Oracle Data Pump D） use DBCA to create a template from the existing database to contain the database structure with data files and then use the same template to create the database in the new location 答案：D41. You are working on the 24X7 database with high transaction volume, to ensure faster instance recovery on your database you set the FAST_START_MTTR_TARGET initialization parameter to a very low value. What effect it will have on the database？ A） The database performance would be enhanced. B） The redo log files would be get filled more frequently. C） The overall database performance would be degraded. D） The mean time to recover （MTTR） would be increased. 答案：C10.5.3 Tuning FAST_START_MTTR_TARGET and Using MTTR Advisorhttp://download.oracle.com/docs/cd/E11882_01/server.112/e10821/instance_tune.htm#PFGRF1301542. You are working on an online transaction processing （OLTP） system. You notice that a PL/SQL procedure got executed twice at 2:00 p.m. This has incorrectly updated the EMP_SAL table. How would you revert the table to its state at 2:00 p.m.？ A） Perform point-in-time recovery to 2:00 p.m. B） Use Flashback Table feature to revert the changes. C） Restore the entire database from the recent backup and open it. D） Issue the rollback statement with system change number （SCN）.  答案：BOracle Flashback 技术总结 http://www.linuxidc.com/Linux/2011-09/42717.htm43. According to your backup strategy, you performed an incremental level 0 backup of your database. Which statement regarding this backup is true？ A） The backup is similar to image copy. B） The backup contains all used data blocks. C） The backup contains only unused data blocks. D） The backup contains all data blocks changed since the last incremental level 1 backup. 答案：B
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