創建3個新的日志組
SQL> ALTER DATABASE ADD LOGFILE GROUP 4 ('/u01/app/oracle/oradata/orcl/redo06.log') SIZE 500M;
SQL> ALTER DATABASE ADD LOGFILE GROUP 5 ('/u01/app/oracle/oradata/orcl/redo05.log') SIZE 500M;
SQL> ALTER DATABASE ADD LOGFILE GROUP 6 ('/u01/app/oracle/oradata/orcl/redo06.log') SIZE 500M;
查看日志組
SQL> select * from v$logfile;
2.切換當前日志到新的日志組
SQL> alter system switch logfile;
SQL> alter system switch logfile;
SQL> alter system switch logfile;
切到要刪除為INCACTIVE才行
SQL> select group#,sequence#,bytes,members,status from v$log;
GROUP# SEQUENCE# BYTES MEMBERS STATUS
---------- ---------- ---------- ---------- ----------------
1 139 52428800 1 INACTIVE
2 137 52428800 1 INACTIVE
3 138 52428800 1 INACTIVE
4 140 524288000 1 ACTIVE
5 141 524288000 1 CURRENT
6 136 524288000 1 INACTIVE
3.刪除舊的日志組
SQL> alter database drop logfile group 1;
Database altered.
SQL> alter database drop logfile group 2;
Database altered.
SQL> alter database drop logfile group 3;
查看是否刪除了日志組
SQL> select group#,sequence#,bytes,members,status from v$log;
GROUP# SEQUENCE# BYTES MEMBERS STATUS
---------- ---------- ---------- ---------- ----------------
4 140 524288000 1 INACTIVE
5 141 524288000 1 CURRENT
6 136 524288000 1 INACTIVE
4.操作系統刪除原日志組1、2、3中的文件
[oracle@oracle122 log]$ cd /u01/app/oracle/oradata/orcl
[oracle@oracle122 orcl]$
[oracle@oracle122 orcl]$ pwd
/u01/app/oracle/oradata/orcl
[oracle@oracle122 orcl]$ ls
control01.ctl example01.dbf redo01.log redo02.log redo03.log redo04.log redo05.log redo06.log sysaux01.dbf system01.dbf temp01.dbf undotbs01.dbf users01.dbf
[oracle@oracle122 orcl]$ rm -rf redo01.log
[oracle@oracle122 orcl]$ rm -rf redo02.log
[oracle@oracle122 orcl]$ rm -rf redo03.log
5.重建日志組1、2、3
SQL> ALTER DATABASE ADD LOGFILE GROUP 1 ('/u01/app/oracle/oradata/orcl/redo01.log') SIZE 500M;
SQL> ALTER DATABASE ADD LOGFILE GROUP 2 ('/u01/app/oracle/oradata/orcl/redo02.log') SIZE 500M;
SQL> ALTER DATABASE ADD LOGFILE GROUP 3 ('/u01/app/oracle/oradata/orcl/redo03.log') SIZE 500M;
7.刪除中間過渡用的日志組4、5、6 ,在刪除時查詢select group#,sequence#,bytes,members,status from v$log; 刪除組是否為INACTIVE,如果不是INACTIVE 就要執行alter system switch logfile;
查詢看一下
SQL> select group#,sequence#,bytes,members,status from v$log;
GROUP# SEQUENCE# BYTES MEMBERS STATUS
---------- ---------- ---------- ---------- ----------------
1 148 524288000 1 CURRENT
2 143 524288000 1 INACTIVE
3 144 524288000 1 INACTIVE
4 146 524288000 1 INACTIVE
5 147 524288000 1 INACTIVE
6 145 524288000 1 INACTIVE
SQL> alter database drop logfile group 4;
Database altered.
SQL> alter database drop logfile group 5;
Database altered.
SQL> alter database drop logfile group 6;
Database altered.
8.到操作系統刪除組4、5、6
[oracle@oracle122 orcl]$ rm -rf redo04.log
[oracle@oracle122 orcl]$ rm -rf redo05.log
[oracle@oracle122 orcl]$ rm -rf redo06.log
9.備份當前最新的控制文件
SQL> alter database backup controlfile to trace resetlogs ;