oracle修改redolog,在线修改REDO LOG的大小及增加新的日志组
查看当前日志组的状态，GROUP编号
sql> SELECT group#,members,bytes/1024/1024 byte_mb,status FROM v$log;
GROUP# MEMBERS BYTE_MB STATUS
---------- ---------- ---------- ------------------------------------------------
1 2 100 CURRENT
2 2 100 INACTIVE
3 2 100 INACTIVE
日志文件所在的位置
sql>SELECT group#,member FROM v$logfile;
GROUP# MEMBER
---------- --------------------
3 /dev/rlv_ora_redo13
3 /dev/rlv_ora_redo14
2 /dev/rlv_ora_redo22
2 /dev/rlv_ora_redo21
1 /dev/rlv_ora_redo11
1 /dev/rlv_ora_redo12
6 rows selected.
增加新的日志组
sql>ALTER DATABASE ADD LOGFILE GROUP4('/usr/oracle/app/oradata/orcl/redo04a.log','/usr/oracle/app/oradata/orcl/redo04b.log') SIZE 2048M;
Database altered.
sql>ALTER DATABASE ADD LOGFILE GROUP5('/usr/oracle/app/oradata/orcl/redo05a.log','/usr/oracle/app/oradata/orcl/redo05b.log') SIZE 2048M;
Database altered.
sql>ALTER DATABASE ADD LOGFILE GROUP6('/usr/oracle/app/oradata/orcl/redo06a.log','/usr/oracle/app/oradata/orcl/redo06b.log') SIZE 2048M;
Database altered.
切换当前日志到新的日志组
alter system switch logfile;
alter system switch logfile;
alter system switch logfile;
查看切换后的状态
sql> SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;
GROUP# MEMBERS BYTE_MB STATUS
---------- ---------- ---------- ------------------------------------------------
1 2 100 ACTIVE
2 2 100 INACTIVE
3 2 100 INACTIVE
4 2 1024 CURRENT
5 2 1024 UNUSED
6 2 1024 UNUSED
6 rows selected.
改变检查点
sql>ALTER SYSTEM CHECKPOINT;
System altered.
备份当前的最新的控制文件
sql>alter database backupcontrolfile to trace resetlogs;
清空重做日志文件
alter database clear logfile group 4;
更改重做日志文件的位置或名称
SQL> ALTER DATABASE RENAME FILE '/u01/app/oracle/oradata/orcl/redo06.log' TO '/db_s3/dbrestore/OOADB/redo06.log';
Database altered.
删除日志组
sql>alter database drop logfile group 4;
sql>alter database drop logfile group 5;
sql>alter database drop logfile group 6;
