探索Oracle不完全恢複之--基於時間恢複

基於時間（time）恢複

基於時間的恢複將資料庫恢複到備份點與失敗點之間的某個時間點。基於時間的恢複不僅在介質失敗的時候使用，也可以在資料庫正常啟動並執行時候使用。例如：某個使用者誤刪除了某個表的資料，這個時候我們可以通過基於時間的恢複來將刪除的資料恢複出來，樣本如下：

 

1、查看目前使用者下的表，只有一張WWL001

21:07:31 SQL> select * from tab;

 

TNAME                          TABTYPE  CLUSTERID

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

WWL001                         TABLE

Elapsed: 00:00:00.06

 

我們通過WWL001來建立WWL002-WWL005 共四張表用來測試不完全恢複

21:08:28 SQL> create table wwl002 asselect * from wwl001;

Table created.

Elapsed: 00:00:00.17

 

21:08:55 SQL> create table wwl003 asselect * from wwl001;

Table created.

Elapsed: 00:00:00.04

 

21:09:00 SQL> create table wwl004 asselect * from wwl001;

Table created.

Elapsed: 00:00:00.03

 

21:09:06 SQL> create table wwl005 asselect * from wwl001;

Table created.

Elapsed: 00:00:00.05

如上表已經建立完成

 

2、我們在21:13:13開始刪除表（請注意時間）

21:13:13 SQL> drop table wwl002 purge;

Table dropped.

Elapsed: 00:00:00.16

 

21:13:28 SQL> drop table wwl003 purge;

Table dropped.

Elapsed: 00:00:00.11

 

21:13:34 SQL> truncate table wwl004;

Table truncated.

Elapsed: 00:00:00.32

 

21:13:44 SQL> truncate table wwl005;

Table truncated.

Elapsed: 00:00:00.07

21:13:47 SQL>

 

因為我們是要做基於時間的恢複，那麼我們只有將資料庫恢複到21:13:13之前的這個時間段，才能把我們剛才建立的表找回來。

 

3、開始執行恢複，先將資料庫啟動到mount狀態

21:14:40 SQL> conn / as sysdba

Connected.

21:14:44 SQL> shutdown immediate

Database closed.

Database dismounted.

Oracle instance shut down.

21:15:20 SQL> startup  mount;

ORACLE instance started.

 

Total System Global Area  100663296 bytes

Fixed Size                  1217884 bytes

Variable Size              88083108 bytes

Database Buffers            8388608 bytes

Redo Buffers                2973696 bytes

Database mounted.

21:15:46 SQL> e

 

4、開始執行restore到備份資料庫的目前狀態：

RMAN> restore database;

 

Starting restore at 12-JUL-12

using target database control file insteadof recovery catalog

allocated channel: ORA_DISK_1

channel ORA_DISK_1: sid=47 devtype=DISK

 

channel ORA_DISK_1: starting datafilebackupset restore

channel ORA_DISK_1: specifying datafile(s)to restore from backup set

restoring datafile 00001 to/DBBak2/oradata/WWL/system01.dbf

restoring datafile 00002 to/DBBak2/oradata/WWL/undotbs01.dbf

restoring datafile 00003 to/DBBak2/oradata/WWL/sysaux01.dbf

restoring datafile 00004 to/DBBak2/oradata/WWL/users01.dbf

restoring datafile 00005 to/DBBak2/oradata/WWL/wwl01.dbf

restoring datafile 00006 to/DBBak2/oradata/WWL/wwl02.dbf

restoring datafile 00007 to/DBBak2/oradata/WWL/wwl03.dbf

channel ORA_DISK_1: reading from backuppiece /DBSoft/product/10.2.0/db_1/dbs/01nft4mu_1_1

channel ORA_DISK_1: restored backup piece1

piecehandle=/DBSoft/product/10.2.0/db_1/dbs/01nft4mu_1_1 tag=TAG20120712T095437

channel ORA_DISK_1: restore complete,elapsed time: 00:01:35

Finished restore at 12-JUL-12

 

RMAN> exit

 

5、執行基於時間點的恢複：

21:27:54 SQL> recover database untiltime ‘YYYY-mm-dd hh24:mi:ss’

21:27:54 SQL> recover database untiltime '2012-07-12 21:10:00';

ORA-00279: change 1436429 generated at07/12/2012 09:54:38 needed for thread 1

ORA-00289: suggestion :/DBSoft/product/10.2.0/db_1/dbs/arch1_3_788372282.dbf

ORA-00280: change 1436429 for thread 1 isin sequence #3

 

 

21:30:09 Specify log:{<RET>=suggested | filename | AUTO | CANCEL}

auto

ORA-00279: change 1440657 generated at 07/12/201214:00:52 needed for thread 1

ORA-00289: suggestion :/DBSoft/product/10.2.0/db_1/dbs/arch1_1_788450452.dbf

ORA-00280: change 1440657 for thread 1 isin sequence #1

 

 

ORA-00279: change 1440855 generated at07/12/2012 15:08:58 needed for thread 1

ORA-00289: suggestion :/DBSoft/product/10.2.0/db_1/dbs/arch1_1_788454538.dbf

ORA-00280: change 1440855 for thread 1 isin sequence #1

 

 

ORA-00279: change 1441316 generated at07/12/2012 15:19:50 needed for thread 1

ORA-00289: suggestion : /DBSoft/product/10.2.0/db_1/dbs/arch1_1_788455190.dbf

ORA-00280: change 1441316 for thread 1 isin sequence #1

 

 

ORA-00279: change 1442275 generated at07/12/2012 15:52:01 needed for thread 1

ORA-00289: suggestion :/DBSoft/product/10.2.0/db_1/dbs/arch1_1_788457121.dbf

ORA-00280: change 1442275 for thread 1 isin sequence #1

 

 

ORA-00279: change 1442953 generated at07/12/2012 16:25:06 needed for thread 1

ORA-00289: suggestion :/DBSoft/product/10.2.0/db_1/dbs/arch1_1_788459106.dbf

ORA-00280: change 1442953 for thread 1 is insequence #1

 

 

ORA-00279: change 1462958 generated at07/12/2012 16:28:16 needed for thread 1

ORA-00289: suggestion :/DBSoft/product/10.2.0/db_1/dbs/arch1_2_788459106.dbf

ORA-00280: change 1462958 for thread 1 isin sequence #2

ORA-00278: log file '/DBSoft/product/10.2.0/db_1/dbs/arch1_1_788459106.dbf'no longer needed for this recovery

 

 

ORA-00279: change 1462963 generated at07/12/2012 17:17:59 needed for thread 1

ORA-00289: suggestion :/DBSoft/product/10.2.0/db_1/dbs/arch1_1_788462279.dbf

ORA-00280: change 1462963 for thread 1 isin sequence #1

 

 

ORA-00279: change 1483784 generated at07/12/2012 17:54:25 needed for thread 1

ORA-00289: suggestion :/DBSoft/product/10.2.0/db_1/dbs/arch1_2_788462279.dbf

ORA-00280: change 1483784 for thread 1 isin sequence #2

ORA-00278: log file'/DBSoft/product/10.2.0/db_1/dbs/arch1_1_788462279.dbf' no longer needed forthis recovery

 

 

Log applied.

Media recovery complete.

21:30:29 SQL>

至此已經恢複完成。

 

6、因為做了不完全恢複，必須要做restlogs開啟資料庫。

21:30:29 SQL> alter database open restlogs;

alter database open restlogs

 

7、資料已經恢複完成，資料都回來了。

21:34:04 SQL> select * from wwl002;

 

       ID NAME

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

        1 wwl

        2 prodence

        3 woo

        4 xgx

        5 cms

 

Elapsed: 00:00:00.01

21:34:16 SQL> select * from wwl003;

 

       ID NAME

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

        1 wwl

        2 prodence

        3 woo

        4 xgx

        5 cms

 

Elapsed: 00:00:00.00

21:34:18 SQL> select * from wwl004;

 

       ID NAME

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

        1 wwl

        2 prodence

        3 woo

        4 xgx

        5 cms

 

Elapsed: 00:00:00.01

21:34:20 SQL> select * from wwl005;

 

       ID NAME

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

        1 wwl

        2 prodence

        3 woo

        4 xgx

        5 cms

 

Elapsed: 00:00:00.01

21:34:22 SQL>

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