1.创建3个新的日志组
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;?
查看日志组
SQL> select * from v$logfile;
2.切换当前日志到新的日志组
SQL> alter system switch logfile;
SQL> alter system switch logfile;
SQL> alter system switch logfile;?
切到要删除为INCACTIVE才行?
SQL> select group#,sequence#,bytes,members,status from v$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.删除旧的日志组
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;?
查看是否删除了日志组
SQL> select group#,sequence#,bytes,members,status from v$log;
? ? GROUP#? SEQUENCE#? ? BYTES? ? MEMBERS STATUS
---------- ---------- ---------- ---------- ----------------
? 4? 140? 524288000? 1 INACTIVE
? 5? 141? 524288000? 1 CURRENT
? 6? 136? 524288000? 1 INACTIVE
4.操作系统删除原日志组1、2、3中的文件?
[oracle@oracle122 log]$ 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.重建日志组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.删除中间过渡用的日志组4、5、6 ，在删除时查询select group#,sequence#,bytes,members,status from v$log; 删除组是否为INACTIVE，如果不是INACTIVE 就要执行alter system switch logfile;
查询看一下
SQL> select group#,sequence#,bytes,members,status from v$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.到操作系统删除组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.备份当前最新的控制文件
SQL>? alter database backup controlfile to trace resetlogs? ;