【ORACLE】oracle 日誌檔案管理
修改Oracle重做日誌檔案大小
建立新的日誌組1 刪除舊的日誌組0（舊的日誌組狀態需要是INACTIVE） 建立新的日誌組2，組名為舊的日誌組0的組名
刪除日誌組1
----------------------------------------------
具體操作步驟：
----------------------------------------------
1. 建立3個新的日誌組
ALTER DATABASE ADD LOGFILE GROUP 4 ('/u01/app/oracle/oradata/orcl/redo06.log') SIZE 500M;
ALTER DATABASE ADD LOGFILE GROUP 5 ('/u01/app/oracle/oradata/orcl/redo05.log') SIZE 500M;
ALTER DATABASE ADD LOGFILE GROUP 6 ('/u01/app/oracle/oradata/orcl/redo06.log') SIZE 500M;
檢視日誌組
select * from v$logfile;
2.切換當前日誌到新的日誌組
alter system switch logfile; alter system switch logfile; alter system switch logfile;
切到要刪除為INCACTIVE才行
select group#,sequence#,bytes,members,status from v$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. 刪除舊的日誌組
alter database drop logfile group 1;
Database altered.
4. 檢視是否刪除了日誌組
select group#,sequence#,bytes,members,status from v$log;
GROUP# SEQUENCE# BYTES MEMBERS STATUS
---------- ---------- ---------- ---------- ----------------
4 140 524288000 1 INACTIVE
5 141 524288000 1 CURRENT
6 136 524288000 1 INACTIVE
5. 作業系統刪除原日誌組1、2、3中的檔案
[[email protected] log]$ cd /u01/app/oracle/oradata/orcl [[email protected] orcl]$ pwd /u01/app/oracle/oradata/orcl [[email protected] 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 [[email protected] orcl]$ rm -rf redo01.log [[email protected] orcl]$ rm -rf redo02.log [[email protected] orcl]$ rm -rf redo03.log
6. 重建日誌組 1、2、3
ALTER DATABASE ADD LOGFILE GROUP 1 ('/u01/app/oracle/oradata/orcl/redo01.log') SIZE 500M;
ALTER DATABASE ADD LOGFILE GROUP 2 ('/u01/app/oracle/oradata/orcl/redo02.log') SIZE 500M;
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誌組4、5、6 ，在刪除時查詢select group#,sequence#,bytes,members,status from v$log; 刪除組是否為INACTIVE，如果不是INACTIVE 就要執行alter system switch logfile;
查詢看一下
select group#,sequence#,bytes,members,status from v$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. 到作業系統刪除組4、5、6
[[email protected] orcl]$ rm -rf redo04.log [[email protected] orcl]$ rm -rf redo05.log [[email protected] orcl]$ rm -rf redo06.log
9. 備份當前最新的控制檔案
alter database backup controlfile to trace resetlogs ;