探索Oracle不完全恢复之--基于SCN恢复 第一篇
基于SCN恢复 第一篇
1、在删除数据之前，察看下SCN号是多少：
SQL> col name format a45
SQL> set line 300
SQL> select name,checkpoint_change# from v$datafile_header;
NAME CHECKPOINT_CHANGE#
---------------------------------------------------------------
/DBBak2/oradata/WWL/system01.dbf 1487389
/DBBak2/oradata/WWL/undotbs01.dbf 1487389
/DBBak2/oradata/WWL/sysaux01.dbf 1487389
/DBBak2/oradata/WWL/users01.dbf 1487389
/DBBak2/oradata/WWL/wwl01.dbf 1487389
/DBBak2/oradata/WWL/wwl02.dbf 1487389
/DBBak2/oradata/WWL/wwl03.dbf 1487389
7 rows selected.
SQL> select file#,checkpoint_change#from v$datafile;
FILE# CHECKPOINT_CHANGE#
---------- ------------------
1 1487389
2 1487389
3 1487389
4 1487389
5 1487389
6 1487389
7 1487389
7 rows selected.
SQL>
2、删除测试用表：
SQL> drop table wwl002 purge;
Table dropped.
SQL> drop table wwl003 purge;
Table dropped.
SQL> drop table wwl004 purge;
Table dropped.
SQL> drop table wwl005 purge;
Table dropped.
3、开始做基于SCN的恢复：
SQL> recover database until change1487389;
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
Specify log: {<RET>=suggested |filename | AUTO | CANCEL}
auto
ORA-00279: change 1440657 generated at07/12/2012 14:00:52 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 isin sequence #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 forthis 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
ORA-00279: change 1486119 generated at07/12/2012 20:35:27 needed for thread 1
ORA-00289: suggestion :/DBSoft/product/10.2.0/db_1/dbs/arch1_1_788474127.dbf
ORA-00280: change 1486119 for thread 1 isin sequence #1
Log applied.
Media recovery complete.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01589: must use RESETLOGS orNORESETLOGS option for database open
SQL> alter database open resetlogs;
Database altered.
SQL>
4、至此，数据已经恢复完成：
SQL> select * from tab;
TNAME TABTYPE CLUSTERID
------------------------------ -----------------
WWL001 TABLE
WWL002 TABLE
WWL003 TABLE
WWL004 TABLE
WWL005 TABLE
SQL> select * from wwl005;
ID NAME
---------- ---------------------------------------------
1 wwl
2 prodence
3 woo
4 xgx
5 cms
SQL>
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