Oracle 基于用户管理的不完全恢复（三）
案例2――恢复过去某个时间点误操作的表（DML）
1、基于change （scn）
SQL> conn scott/tiger
Connected.
SQL> select * from tb01;
ID
----------
1
2
3
SQL> drop table tb01 purge;
Table dropped.
SQL> create table tb01(id int) tablespace test;
Table created.
SQL> insert into tb01 values(1);
1 row created.
SQL> commit;
Commit complete.
――通过logmr 分析出误操作的scn
SQL> select username,scn,timestamp,sql_redo from v$logmnr_contents
2 where username='SCOTT' and lower(sql_redo) like '%table%';
USERNAME SCN TIMESTAMP SQL_REDO
---------- ---------- ------------------- --------------------------------------------------
SCOTT 851229 2012-03-23 15:45:22 drop table tb01 purge;
SCOTT 851264 2012-03-23 15:45:45 create table tb01(id int) tablespace test;
――这是一种偷懒的方法，在生产环境不能使用
05:52:30 SQL> select current_scn from v$database; //datablock 记录的scn
CURRENT_SCN
-----------
1260285
――test 表里的记录
SQL> select * from scott.tb01;
ID
----------
1
2、进行基于change的恢复
――在mount状态，进行restore 和recover
――restore 所有的datafile
SQL> startup force mount
ORACLE instance started.
Total System Global Area 314572800 bytes
Fixed Size 1279964 bytes
Variable Size 58722340 bytes
Database Buffers 251658240 bytes
Redo Buffers 2912256 bytes
Database mounted.
SQL> !
[oracle@solaris10 ~]$cp /disk1/backup/anny/cold_bak/*.dbf /u01/app/oracle/oradata/anny/
SQL> select file#,checkpoint_change# from v$datafile;――控制文件的scn号较新
FILE# CHECKPOINT_CHANGE#
---------- ------------------
1 856024
3 856024
4 856024
5 856024
7 856024
10 856024
11 856024
12 856024
8 rows selected.
SQL> select file#,checkpoint_change# from v$datafile_header;
FILE# CHECKPOINT_CHANGE#
---------- ------------------
1 850758
3 850758
4 850758
5 850758
7 850758
10 850758
11 850758
12 850758
8 rows selected.
――基于change 的recover
SQL> recover database until change 851229;
ORA-00279: change 850758 generated at 03/23/2012 15:29:42 needed for thread 1
ORA-00289: suggestion : /disk1/arch/anny/arch_1_1_778691360.log
ORA-00280: change 850758 for thread 1 is in sequence #1
Specify log: {=suggested | filename | AUTO | CANCEL}
auto
ORA-00279: change 850903 generated at 03/23/2012 15:35:17 needed for thread 1
ORA-00289: suggestion : /disk1/arch/anny/arch_1_2_778691360.log
ORA-00280: change 850903 for thread 1 is in sequence #2
ORA-00278: log file '/disk1/arch/anny/arch_1_1_778691360.log' no longer needed for this recovery
Log applied.
Media recovery complete.
查看告警日志：
ALTER DATABASE RECOVER database until change 851229
Fri Mar 23 16:02:19 2012
Media Recovery Start
ORA-279 signalled during: ALTER DATABASE RECOVER database until change 851229 ...
Fri Mar 23 16:02:24 2012
ALTER DATABASE RECOVER CONTINUE DEFAULT
Fri Mar 23 16:02:24 2012
Media Recovery Log /disk1/arch/anny/arch_1_1_778691360.log
ORA-279 signalled during: ALTER DATABASE RECOVER CONTINUE DEFAULT ...
Fri Mar 23 16:02:25 2012
ALTER DATABASE RECOVER CONTINUE DEFAULT
Fri Mar 23 16:02:25 2012
Media Recovery Log /disk1/arch/anny/arch_1_2_778691360.log
Fri Mar 23 16:02:25 2012
Recovery of Online Redo Log: Thread 1 Group 3 Seq 3 Reading mem 0
Mem# 0 errs 0: /disk3/oradata/anny/redo03a.log
Mem# 1 errs 0: /disk1/oradata/anny/redo03b.log
Mem# 2 errs 0: /disk2/oradata/anny/redo03c.log
Fri Mar 23 16:02:25 2012
Recovery of Online Redo Log: Thread 1 Group 4 Seq 4 Reading mem 0
Mem# 0 errs 0: /disk3/oradata/anny/redo04a.log
Mem# 1 errs 0: /disk1/oradata/anny/redo04b.log
Mem# 2 errs 0: /disk2/oradata/anny/redo04c.log
Fri Mar 23 16:02:25 2012
Recovery of Online Redo Log: Thread 1 Group 2 Seq 5 Reading mem 0
Mem# 0 errs 0: /disk3/oradata/anny/redo02a.log
Mem# 1 errs 0: /disk1/oradata/anny/redo02b.log
Mem# 2 errs 0: /disk2/oradata/anny/redo02c.log
Fri Mar 23 16:02:25 2012
Recovery of Online Redo Log: Thread 1 Group 1 Seq 6 Reading mem 0
Mem# 0 errs 0: /disk3/oradata/anny/redo01a.log
Mem# 1 errs 0: /disk1/oradata/anny/redo01b.log
Mem# 2 errs 0: /disk2/oradata/anny/redo01c.log
Fri Mar 23 16:02:25 2012
Incomplete Recovery applied until change 851229
Fri Mar 23 16:02:25 2012
Media Recovery Complete (anny)
Completed: ALTER DATABASE RECOVER CONTINUE DEFAULT
――验证
SQL> select * from scott.tb01;
ID
----------
1
2
3
3 rows selected.
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