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?
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.