Oracle SYSAUX表空间的恢复
SYSAUX表空间是在10g之后引入的一个新的表空间，主要用于减轻对SYSTEM表空间的压力而作为SYSTEM表空间的辅助表空间。原来存放于SYSTEM表空间的很多组件以及一些数据库元数据在10g中被移植到SYSAUX表空间。
SYSAUX表空间在正常的数据库操作中不能被删除，或重命名，也不支持可移动表空间功能，但可以脱机。如果SYSAUX表空间失效，比如发生介质故障后有些数据库的功能会随之失效。
第一部分 通过UMAN恢复
1.
SQL> select * from t1;
ID
----------
1
2
3
SQL> alter tablespace sysaux begin backup;
Tablespace altered.
SQL> host cp /u01/oradata/orcl/sysaux01.dbf /u01/rmanbak/
SQL> alter tablespace sysaux end backup;
Tablespace altered.
SQL>
SQL> select * from t1;
ID
----------
1
2
3
4
5
SQL> insert into t1 values(9);
1 row created.
SQL> commit;
Commit complete.
SQL> select * from t1;
ID
----------
1
2
3
9
4
5
6 rows selected.
SQL> host rm /u01/oradata/orcl/sysaux01.dbf
SQL> host ls -l /u01/oradata/orcl/sysaux01.dbf
ls: /u01/oradata/orcl/sysaux01.dbf: No such file or directory
SQL>
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL>
SQL>
SQL> startup
ORACLE instance started.
Total System Global Area 209715200 bytes
Fixed Size 1218556 bytes
Variable Size 62916612 bytes
Database Buffers 142606336 bytes
Redo Buffers 2973696 bytes
Database mounted.
ORA-01157: cannot identify/lock data file 3 - see DBWR trace file
ORA-01110: data file 3: '/u01/oradata/orcl/sysaux01.dbf'
SQL>
SQL> host cp /u01/rmanbak/sysaux01.dbf /u01/oradata/orcl/
SQL> recover datafile 3;
Media recovery complete.
SQL>
SQL> alter database open;
Database altered.
SQL> select * from t1;
ID
----------
1
2
3
9
4
5
6 rows selected.
第二部分：使用rman恢复
1.备份
RMAN> backup tablespace sysaux format '/u01/rmanbak/%u_%d_%T';
Starting backup at 02-APR-13
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=154 devtype=DISK
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00003 name=/u01/oradata/orcl/sysaux01.dbf
channel ORA_DISK_1: starting piece 1 at 02-APR-13
channel ORA_DISK_1: finished piece 1 at 02-APR-13
piece handle=/u01/rmanbak/04o632e4_ORCL_20130402 tag=TAG20130402T155028 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:26
Finished backup at 02-APR-13
RMAN>
2.prepare
SQL> create table t1(id int) tablespace dt;
Table created.
SQL> insert into t1 values(1);
1 row created.
SQL> commit;
Commit complete.
SQL> insert into t1 values(2);
1 row created.
SQL> commit;
Commit complete.
SQL> insert into t1 values(3);
1 row created.
SQL> commit；
Commit complete.
SQL> alter system switch logfile;
System altered.
SQL>
SQL> insert into t1 values(4);
1 row created.
SQL> commit;
Commit complete.
SQL> insert into t1 values(5);
1 row created.
SQL> commit;
Commit complete.
3.故障模拟
[oracle@ora10g orcl]$ date
Tue Apr 2 15:56:12 CST 2013
[oracle@ora10g orcl]$
[oracle@ora10g orcl]$ mv sysaux01.dbf sysaux01.dbf.bak
[oracle@ora10g orcl]$ date
Tue Apr 2 15:56:44 CST 2013
Tue Apr 2 15:56:44 CST 2013
[oracle@ora10g orcl]$ exit
exit
SQL> insert into t1 values(8);
1 row created.
SQL> commit;
Commit complete.
SQL> insert into t1 values(9);
1 row created.
SQL> commit;
Commit complete.
SQL> insert into t1 values(10);
1 row created.
SQL> commit;
Commit complete.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL>
SQL>
SQL> startup
ORACLE instance started.
Total System Global Area 209715200 bytes
Fixed Size 1218556 bytes
Variable Size &
