联机日志损坏时的恢复（正常关闭数据库）

联机日志损坏时的恢复（正常关闭数据库）

1.创建一个表T2插入两行数据,第一行数据写如果归档日志,第二行数据在联机日志中
SQL> create table t2(
          a1 number(10),
          a2 char(10)) tablespace users;
SQL> insert into t2 values (11,'aa');
SQL> commit;
SQL> alter system switch logfile;
SQL> insert into t2 values(22,'bb');
SQL> commit;
 
2.查询日志文件
SQL> select member from v$logfile;
 
MEMBER
--------------------------------------------------------------------------------
/database/ykg/ykg1a.log
/database/ykg/ykg2a.log
 
3.正常关闭数据库
SQL> shutdown immediate
Database closed.
Database dismounted.
Oracle instance shut down.
 
4.模拟联机日志文件损坏
SQL> host rm -rf /database/ykg/ykg*.log
 
5.正常启动数据库报错
SQL> startup
ORACLE instance started.
 
Total System Global Area 293601280 bytes
Fixed Size                  2020392 bytes
Variable Size              92277720 bytes
Database Buffers          197132288 bytes
Redo Buffers                2170880 bytes
Database mounted.
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: '/database/ykg/ykg1a.log'
 
6.查看当前联机日志的SEQUENCE号
SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     191
Next log sequence to archive   192
Current log sequence           192
 
7.假装执行不完全恢复来恢复日志组
RMAN> run {
2> recover database until sequence 193 thread 1;
3> alter database open resetlogs;}
 
8.验证日志成员已恢复,数据没有丢失
SQL> select member from v$logfile;
MEMBER
--------------------------------------------------------------------------------
/database/ykg/ykg1a.log
/database/ykg/ykg2a.log