OCP-1Z0-052-V8.02-82题

82. You are managing an Oracle Database 11g database with the following backup strategy:

1) On Sunday, an incremental level 0 tape backup is performed.

2) Monday through Saturday, a cumulative incremental level 1 tape backup is performed.

Which two statements are true regarding the backups performed? (Choose two.)

A.The backup performed in step 1 backs up all blocks that have ever been in use in the database.

B.The backup performed in step 2 copies all the blocks changed since the most recent level 0 backup. 

C.The backup performed in step 1 backs up all the blocks changed since the most recent level 1 backup.

D.The backup performed in step 2 backs up all blocks that have changed since the most recent

incremental backup at level 1.

Answer: AB  

 

备份策略如下：

 

此题考的是增量累积备份

 

 

Cumulative Incremental Backups增量累积备份

In a cumulative level 1 backup, RMAN backs up all blocks used since the most recent level 0 incremental backup in either the current or parent incarnation.

Cumulative incremental backups reduce the work needed for a restore operation by ensuring that you only need one incremental backup from any particular level.

Cumulative backups require more space and time than differential backups because they duplicate the work done by previous backups at the same level.

 

Sunday

An incremental level 0 backup backs up all blocks that have ever been in use in this database.

0级增量备份会备份所有曾经在此数据库中使用的块。

 

Monday - Saturday

A cumulative incremental level 1 backup copies all blocks changed since the most recent level 0 backup.

Because the most recent level 0 backup was created on Sunday,

the level 1 backup on each day Monday through Saturday backs up all blocks changed since the Sunday backup（level 0 backup）.

增量累积1级备份，备份自最近0级备份所有变化的块。

因为最近0级备份在周日，

从星期一到星期六的1级备份，是备份自周日即0级备份所有变化的块。

 

 

下面是一个执行基本增量备份操作的命令：

1、首先使用rman连接目标库。 rman target /

 

[oracle@rtest ~]$ rman target /

 

Recovery Manager: Release 11.2.0.3.0 - Production on Tue Sep 17 10:12:39 2013

 

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

 

connected to target database: TEST0910 (DBID=1912424611)

 

 

2、执行0级增量备份。                   backup incremental level 0 database

 

RMAN> backup incremental level 0 database;

 

 

Starting backup at 17-SEP-13

using channel ORA_DISK_1

channel ORA_DISK_1: starting incremental level 0 datafile backup set

channel ORA_DISK_1: specifying datafile(s) in backup set

input datafile file number=00001 name=/u01/app/oracle/oradata/test0910/system01.dbf

input datafile file number=00002 name=/u01/app/oracle/oradata/test0910/sysaux01.dbf

input datafile file number=00005 name=/u01/app/oracle/oradata/test0910/example01.dbf

input datafile file number=00003 name=/u01/app/oracle/oradata/test0910/undotbs01.dbf

input datafile file number=00006 name=/u01/app/oracle/oradata/test0910/testtb.dbf

input datafile file number=00004 name=/u01/app/oracle/oradata/test0910/users01.dbf

channel ORA_DISK_1: starting piece 1 at 17-SEP-13

channel ORA_DISK_1: finished piece 1 at 17-SEP-13

piece handle=/u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_17/o1_mf_nnnd0_TAG20130917T101737_93js455s_.bkp tag=TAG20130917T101737comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:17:20

channel ORA_DISK_1: starting incremental level 0 datafile backup set

channel ORA_DISK_1: specifying datafile(s) in backup set

including current control file in backup set

including current SPFILE in backup set

channel ORA_DISK_1: starting piece 1 at 17-SEP-13

channel ORA_DISK_1: finished piece 1 at 17-SEP-13

piece handle=/u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_17/o1_mf_ncsn0_TAG20130917T101737_93jt4oct_.bkp tag=TAG20130917T101737 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:00:08

Finished backup at 17-SEP-13

 

3、执行1级增量累积备份。          backup incremental level 1 cumulative database; 星期一是与0级备份之间的差异备份，星期二是与0级备份之间的差异累积备份，等等。

RMAN>  backup incremental level 1 cumulative database;

 

 

Starting backup at 17-SEP-13

using channel ORA_DISK_1

channel ORA_DISK_1: starting incremental level 1 datafile backup set

channel ORA_DISK_1: specifying datafile(s) in backup set

input datafile file number=00001 name=/u01/app/oracle/oradata/test0910/system01.dbf

input datafile file number=00002 name=/u01/app/oracle/oradata/test0910/sysaux01.dbf

input datafile file number=00005 name=/u01/app/oracle/oradata/test0910/example01.dbf

input datafile file number=00003 name=/u01/app/oracle/oradata/test0910/undotbs01.dbf

input datafile file number=00006 name=/u01/app/oracle/oradata/test0910/testtb.dbf

input datafile file number=00004 name=/u01/app/oracle/oradata/test0910/users01.dbf

channel ORA_DISK_1: starting piece 1 at 17-SEP-13

channel ORA_DISK_1: finished piece 1 at 17-SEP-13

piece handle=/u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_17/o1_mf_nnnd1_TAG20130917T104324_93jtndyx_.bkp tag=TAG20130917T104324comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03

channel ORA_DISK_1: starting incremental level 1 datafile backup set

channel ORA_DISK_1: specifying datafile(s) in backup set

including current control file in backup set

including current SPFILE in backup set

channel ORA_DISK_1: starting piece 1 at 17-SEP-13

channel ORA_DISK_1: finished piece 1 at 17-SEP-13

piece handle=/u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_17/o1_mf_ncsn1_TAG20130917T104324_93jtnjq4_.bkp tag=TAG20130917T104324 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03

Finished backup at 17-SEP-13

 

查看备份集：

RMAN> list backup;

 

 

List of Backup Sets

===================

 

 

BS Key  Type LV Size       Device Type Elapsed Time Completion Time

------- ---- -- ---------- ----------- ------------ ---------------

6       Incr 0  1.16G      DISK        00:17:14     17-SEP-13     

        BP Key: 6   Status: AVAILABLE  Compressed: NO  Tag: TAG20130917T101737

        Piece Name: /u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_17/o1_mf_nnnd0_TAG20130917T101737_93js455s_.bkp

  List of Datafiles in backup set 6

  File LV Type Ckp SCN    Ckp Time  Name

  ---- -- ---- ---------- --------- ----

  1    0  Incr 1506893    17-SEP-13 /u01/app/oracle/oradata/test0910/system01.dbf

  2    0  Incr 1506893    17-SEP-13 /u01/app/oracle/oradata/test0910/sysaux01.dbf

  3    0  Incr 1506893    17-SEP-13 /u01/app/oracle/oradata/test0910/undotbs01.dbf

  4    0  Incr 1506893    17-SEP-13 /u01/app/oracle/oradata/test0910/users01.dbf

  5    0  Incr 1506893    17-SEP-13 /u01/app/oracle/oradata/test0910/example01.dbf

  6    0  Incr 1506893    17-SEP-13 /u01/app/oracle/oradata/test0910/testtb.dbf

 

BS Key  Type LV Size       Device Type Elapsed Time Completion Time

------- ---- -- ---------- ----------- ------------ ---------------

7       Incr 0  9.36M      DISK        00:00:08     17-SEP-13     

        BP Key: 7   Status: AVAILABLE  Compressed: NO  Tag: TAG20130917T101737

        Piece Name: /u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_17/o1_mf_ncsn0_TAG20130917T101737_93jt4oct_.bkp

  SPFILE Included: Modification time: 16-SEP-13

  SPFILE db_unique_name: TEST0910

  Control File Included: Ckp SCN: 1507287      Ckp time: 17-SEP-13

 

BS Key  Type LV Size       Device Type Elapsed Time Completion Time

------- ---- -- ---------- ----------- ------------ ---------------

8       Incr 1  392.00K    DISK        00:01:55     17-SEP-13     

        BP Key: 8   Status: AVAILABLE  Compressed: NO  Tag: TAG20130917T103557

        Piece Name: /u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_17/o1_mf_nnnd1_TAG20130917T103557_93jt6hjt_.bkp

  List of Datafiles in backup set 8

  File LV Type Ckp SCN    Ckp Time  Name

  ---- -- ---- ---------- --------- ----

  1    1  Incr 1507334    17-SEP-13 /u01/app/oracle/oradata/test0910/system01.dbf

  2    1  Incr 1507334    17-SEP-13 /u01/app/oracle/oradata/test0910/sysaux01.dbf

  3    1  Incr 1507334    17-SEP-13 /u01/app/oracle/oradata/test0910/undotbs01.dbf

  4    1  Incr 1507334    17-SEP-13 /u01/app/oracle/oradata/test0910/users01.dbf

  5    1  Incr 1507334    17-SEP-13 /u01/app/oracle/oradata/test0910/example01.dbf

  6    1  Incr 1507334    17-SEP-13 /u01/app/oracle/oradata/test0910/testtb.dbf

 

BS Key  Type LV Size       Device Type Elapsed Time Completion Time

------- ---- -- ---------- ----------- ------------ ---------------

9       Incr 1  9.36M      DISK        00:00:04     17-SEP-13     

        BP Key: 9   Status: AVAILABLE  Compressed: NO  Tag: TAG20130917T103557

        Piece Name: /u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_17/o1_mf_ncsn1_TAG20130917T103557_93jtb225_.bkp

  SPFILE Included: Modification time: 16-SEP-13

  SPFILE db_unique_name: TEST0910

  Control File Included: Ckp SCN: 1507384      Ckp time: 17-SEP-13

 

BS Key  Type LV Size       Device Type Elapsed Time Completion Time

------- ---- -- ---------- ----------- ------------ ---------------

10      Incr 1  472.00K    DISK        00:00:02     17-SEP-13     

        BP Key: 10   Status: AVAILABLE  Compressed: NO  Tag: TAG20130917T104324

        Piece Name: /u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_17/o1_mf_nnnd1_TAG20130917T104324_93jtndyx_.bkp

  List of Datafiles in backup set 10

  File LV Type Ckp SCN    Ckp Time  Name

  ---- -- ---- ---------- --------- ----

  1    1  Incr 1507539    17-SEP-13 /u01/app/oracle/oradata/test0910/system01.dbf

  2    1  Incr 1507539    17-SEP-13 /u01/app/oracle/oradata/test0910/sysaux01.dbf

  3    1  Incr 1507539    17-SEP-13 /u01/app/oracle/oradata/test0910/undotbs01.dbf

  4    1  Incr 1507539    17-SEP-13 /u01/app/oracle/oradata/test0910/users01.dbf

  5    1  Incr 1507539    17-SEP-13 /u01/app/oracle/oradata/test0910/example01.dbf

  6    1  Incr 1507539    17-SEP-13 /u01/app/oracle/oradata/test0910/testtb.dbf

 

BS Key  Type LV Size       Device Type Elapsed Time Completion Time

------- ---- -- ---------- ----------- ------------ ---------------

11      Incr 1  9.36M      DISK        00:00:04     17-SEP-13     

        BP Key: 11   Status: AVAILABLE  Compressed: NO  Tag: TAG20130917T104324

        Piece Name: /u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_17/o1_mf_ncsn1_TAG20130917T104324_93jtnjq4_.bkp

  SPFILE Included: Modification time: 16-SEP-13

  SPFILE db_unique_name: TEST0910

  Control File Included: Ckp SCN: 1507540      Ckp time: 17-SEP-13

 

官网参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmcncpt.htm#sthref707