[bbk4343]小布-OCP 042全真试题讲解
参考视频:小布-OCP 042全真试题讲解
[*]1、You are in the middle of a transaction and very crucial data has been modified.Because of a hardware failure,the instance has shutdown before synchronizing all the database files.
Which two statements are true ? (Choose two.)
[*]
[*]A.On startup,SMON coordinates instnace recovery.
[*]B.On startup,CKPT coordinates instance recovery.
[*]C.On startup,use RMAN to perform instance recovery.
[*]D.Uncommitted changes will be rolled back after the database is opened.
[*]E.On startup,perform media recovery and then instance recovery.
[*]F.On startup,all the files will be synchronized and you get both committed and uncommitted data.
instance recovery是用SMON进程自动实现的.instance recovery是不需要DBA干预的.说白了instance recovery是SMON干的活，不属于RMAN的活；RMAN的主要工作时media reovery.
media recovery可以理解为磁盘损坏.RMAN主要是用来做Media Recovery.
[*]2、You want the user APP_DBA to administer the Oracle database from a remote machine.APP_DBA is granted the SYSDBA privilgeg to perform administrative tasks on the database.
Which file is used by the Oracle Database server to authenticate APP_DBA?
[*]
[*]A.control file
[*]B.password file
[*]C.listener controller file
[*]D.control file and password file
[*]3、which three statements are true regarding the logical structure of the Oracle database ?(choose three)
[*]A.Each segment contains one or more extents.
[*]B.Multiple tablespace can share single data file.
[*]C. data block is the smallest unit of I/O for datafiles.
[*]D.It is possible to have tablespace of different block size in a database.
[*]E.Each data block in the database always corresponds to one OS block.
[*]4、Which is the memory area that is created when a dedicated server process is started,and contains data and control information for that server process?
[*]A.SGA
[*]B.PGA
[*]C.Shared Pool
[*]D.Streams Pool
系统表空间和临时表空间的block size大小是由db_block_size参数指定的，其他的表空间的大小可以由db_block_size参数指定，也可以由其他参数指定.
[*]5、You find that the database perfomance degrades while you backup the PROD database using Recovery Manager(RMAN).The PROD database is running in shared server mode.The database instance is currently using 60% of total operating system memory.You suspect the shared pool fragmentatation to be the reason.
Which action would you consider to overcome the perfomance degradation?
[*]
[*]A.Configure Java Pool to cache the java objects.
[*]B.Configure Streams Pool to enable parallel processing.
[*]C.Increase Shared Pool Size to cache more PL/SQL objects.
[*]D.Increase Database Buffer Cache size to increase cache hits.
[*]E.Configure Large Pool to be used by RMAN and shared server.
[*]F.Increase the total system global area(SGA) size to increase memory hints.
Shared Server模式下,使用RMAN做备份时，通过增加LARGE POOL SIZE来配合使用，会更加有效；否则RMAN会挤占Shared Pool中的资源，从而降低数据库性能.
页:
[1]