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探索oracle不完全恢复之--基于scn恢复 第一篇
[日期：2012-07-31]来源：linux社区 作者：吴伟龙[字体：]
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: {=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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