RAC 下基于时间点的恢复
1、源库进行备份 我这里进行了2次备份
2、拷贝2次的备份集到目标机器上，在目标机器上建立好SPFILE.
3、使用recover controlfile from 进行控制文件恢复，这个没什么好说的确定好控制文件所在备份集进行恢复就可以了。
4、重新命名进行恢复
run {
set newname for datafile '+DATA/rac/datafile/system.270.790795355' to '/home/oradba/db/rac/system.dbf';
set newname for datafile '+DATA/rac/datafile/sysaux.271.790795355' to '/home/oradba/db/rac/sysaux.dbf';
set newname for datafile '+DATA/rac/datafile/undotbs1.272.790795355' to '/home/oradba/db/rac/undotbs1.dbf';
set newname for datafile '+DATA/rac/datafile/users.273.790795355' to '/home/oradba/db/rac/users.dbf';
set newname for datafile '+DATA/rac/datafile/undotbs2.278.790795443' to '/home/oradba/db/rac/undotbs2.dbf';
restore database from tag='TAG20120921T224531';
}
完成后可以用report schema看一下
5、重命令控制文件中记录的文件包括数据文件和日志文件
alter database rename file '+DATA/rac/datafile/system.270.790795355' to '/home/oradba/db/rac/system.dbf';
alter database rename file '+DATA/rac/datafile/sysaux.271.790795355' to '/home/oradba/db/rac/sysaux.dbf';
alter database rename file '+DATA/rac/datafile/undotbs1.272.790795355' to '/home/oradba/db/rac/undotbs1.dbf';
alter database rename file '+DATA/rac/datafile/users.273.790795355' to '/home/oradba/db/rac/users.dbf';
alter database rename file '+DATA/rac/datafile/undotbs2.278.790795443' to '/home/oradba/db/rac/undotbs2.dbf';
alter database rename file '+DATA/rac/datafile/logfile1.dbf' to '/home/oradba/db/rac/logfile1.dbf';
...........
6、确定时间点
run {
set until time "to_date('2012-09-22 18:59:40','yyyy-mm-dd hh24:mi:ss')";
recover database;
}
7、alter database open resetlogs;
8、重建临时表空间
SQL> create temporary tablespace temp1 tempfile '/home/oradba/db/rac/temp1.dbf' size 100m autoextend on;
Tablespace created.
SQL> alter database default temporary tablespace temp1;
Database altered.
SQL> drop tablespace temp;
Tablespace dropped.
9、删除无用的日志组
THREAD# STATUS ENABLED GROUPS INSTANCE
---------- ------ -------- ---------- ------------------------------------------
1 OPEN PUBLIC 2 rac
2 CLOSED PUBLIC 2 rac2
SQL> alter database disable thread 2;
Database altered.
QL> select * from v$log;
truncating (as requested) before column FIRST_CHANGE#
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRS
---------- ---------- ---------- ---------- ---------- --- ---------------- ----
1 1 3 52428800 1 YES INACTIVE 22-S
2 1 4 52428800 1 NO CURRENT 22-S
3 2 1 52428800 1 YES INACTIVE 22-S
4 2 2 52428800 1 NO INACTIVE 22-S
SQL> alter database drop logfile group 3;
Database altered.
SQL> lter database drop logfile group 4;
SP2-0734: unknown command beginning "lter datab..." - rest of line ignored.
SQL> alter database drop logfile group 4;
alter database drop logfile group 4
*
ERROR at line 1:
ORA-00350: log 4 of instance rac2 (thread 2) needs to be archived
ORA-00312: online log 4 thread 2: '/home/oradba/db/rac/redo4.log'
SQL> alter database clear unarchived logfile group 4;
Database altered.
SQL>
SQL> alter database drop logfile group 4;
Database altered.
10、删除不用的UNDO tablespace
SQL> show parameter undo
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
undo_management string AUTO
undo_retention integer 900
undo_tablespace string UNDOTBS1
SQL> drop tablespace undotbs2 including contents and datafiles;
Tablespace dropped.
至此完成。
