10g OCFS2系统RAC节点更改redolog

某电子政务系统,10g的OCFS2架构的RAC系统 redolog 设置太小、没有镜像,redo log 设置太小则容易导致日志切换过于频繁,对系统IO有影响

现在较原始的方法增加新的redo log

注:在业务的低谷期间进行redo log的删改

1.查询当前redolog 情况

SQL>  select group#,thread#,SEQUENCE# ,BYTES/1024/1024 "MB", ARCHIVED,STATUS,FIRST_CHANGE# ,FIRST_TIME FROM V$LOG;

    GROUP#    THREAD#  SEQUENCE#         MB ARC STATUS           FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
         1          1     436448         50 YES ACTIVE              1.3795E+13 06-MAY-14
         2          1     436450         50 NO  CURRENT             1.3795E+13 06-MAY-14
         3          1     436449         50 YES ACTIVE              1.3795E+13 06-MAY-14      
         4          2     175630         50 NO  CURRENT             1.3795E+13 06-MAY-14
         5          2     175628         50 YES INACTIVE            1.3795E+13 06-MAY-14
         6          2     175629         50 YES ACTIVE              1.3795E+13 06-MAY-14


SQL> select * from v$logfile;

    GROUP# STATUS  TYPE    MEMBER                          IS_
---------- ------- ------- ------------------------------- ---
         1         ONLINE  /oradata/orcl/redo01.log        NO
         2         ONLINE  /oradata/orcl/redo02.log        NO
         3         ONLINE  /oradata/orcl/redo03.log        NO
         4         ONLINE  /oradata/orcl/redo04.log        NO
         5         ONLINE  /oradata/orcl/redo05.log        NO
         6         ONLINE  /oradata/orcl/redo06.log        NO


2. 增加新的redo log 

分别先后在节点1,2逐个操作

节点1 上操作

ALTER DATABASE                                              
ADD LOGFILE GROUP 7 ('/oradata/orcl/redo07a.log','/oradata/orcl/redo07b.log') SIZE 400M;

节点 2 上操作
ALTER DATABASE                                                                          
ADD LOGFILE GROUP 8 ('/oradata/orcl/redo08a.log','/oradata/orcl/redo08b.log') SIZE 400M;


节点1 上操作

ALTER DATABASE                                              
ADD LOGFILE GROUP 9 ('/oradata/orcl/redo09a.log','/oradata/orcl/redo09b.log') SIZE 400M;


节点 2 上操作
ALTER DATABASE                                                                          
ADD LOGFILE GROUP 10 ('/oradata/orcl/redo10a.log','/oradata/orcl/redo10b.log') SIZE 400M;


节点1 上操作

ALTER DATABASE                                              
ADD LOGFILE GROUP 11 ('/oradata/orcl/redo11a.log','/oradata/orcl/redo11b.log') SIZE 400M;



节点 2 上操作
ALTER DATABASE                                                                          
ADD LOGFILE GROUP 12 ('/oradata/orcl/redo12a.log','/oradata/orcl/redo12b.log') SIZE 400M;


2.所有新redo log 增加完成之后 ,查看目前所有redolog

SQL> select group#,thread#,SEQUENCE# ,BYTES/1024/1024 "MB", ARCHIVED,STATUS,FIRST_CHANGE# ,FIRST_TIME FROM V$LOG;

    GROUP#    THREAD#  SEQUENCE#         MB ARC STATUS           FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
         1          1     436472         50 YES INACTIVE            1.3795E+13 06-MAY-14
         2          1     436471         50 YES INACTIVE            1.3795E+13 06-MAY-14
         3          1     436473         50 YES ACTIVE              1.3795E+13 06-MAY-14
         4          2     175636         50 YES INACTIVE            1.3795E+13 06-MAY-14
         5          2     175637         50 YES INACTIVE            1.3795E+13 06-MAY-14
         6          2     175638         50 YES ACTIVE              1.3795E+13 06-MAY-14
         7          1     436474        400 NO  CURRENT             1.3795E+13 06-MAY-14
         8          2     175639        400 NO  CURRENT             1.3795E+13 06-MAY-14
         9          1          0        400 YES UNUSED                       0
        10          2          0        400 YES UNUSED                       0
        11          1          0        400 YES UNUSED                       0
        12          2          0        400 YES UNUSED                       0
        

3.设置全局检查点,使要被delete的redo log变成INACTIVE、多次切换日志、delete过小的redolog

SQL> alter system checkpoint global; 

System altered.

SQL> alter system switch logfile;

System altered.

SQL> select group#,thread#,SEQUENCE# ,BYTES/1024/1024 "MB", ARCHIVED,STATUS,FIRST_CHANGE# ,FIRST_TIME FROM V$LOG;

    GROUP#    THREAD#  SEQUENCE#         MB ARC STATUS           FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
         1          1     436472         50 YES INACTIVE            1.3795E+13 06-MAY-14
         2          1     436471         50 YES INACTIVE            1.3795E+13 06-MAY-14
         3          1     436473         50 YES INACTIVE              1.3795E+13 06-MAY-14
         4          2     175636         50 YES INACTIVE            1.3795E+13 06-MAY-14
         5          2     175637         50 YES INACTIVE            1.3795E+13 06-MAY-14
         6          2     175638         50 YES INACTIVE            1.3795E+13 06-MAY-14
         7          1     436474        400 YES INACTIVE            1.3795E+13 06-MAY-14
         8          2     175639        400 NO  CURRENT             1.3795E+13 06-MAY-14
         9          1     436475        400 NO  CURRENT             1.3795E+13 06-MAY-14
        10          2          0        400 YES UNUSED                       0
        11          1          0        400 YES UNUSED                       0
        12          2          0        400 YES UNUSED                       0
      

4.delete原来50M 状态为INACTIVE的redo log 若原来的redo log状态为非INACTIVE,则多做几次全局检查点和切换redo log 即可
 
alter database drop logfile group 1;
alter database drop logfile group 2;
alter database drop logfile group 3;
alter database drop logfile group 4;
alter database drop logfile group 5;
alter database drop logfile group 6;

 

5.查看当前最新redo log
  
SQL> select group#,thread#,SEQUENCE# ,BYTES/1024/1024 "MB", ARCHIVED,STATUS,FIRST_CHANGE# ,FIRST_TIME FROM V$LOG;

    GROUP#    THREAD#  SEQUENCE#         MB ARC STATUS           FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
         7          1     436474        400 YES INACTIVE            1.3795E+13 06-MAY-14
         8          2     175639        400 NO  CURRENT             1.3795E+13 06-MAY-14
         9          1     436475        400 NO  CURRENT             1.3795E+13 06-MAY-14
        10          2          0        400 YES UNUSED                       0
        11          1          0        400 YES UNUSED                       0
        12          2          0        400 YES UNUSED                       0

 
SQL> select * from v$logfile

    GROUP# STATUS  TYPE    MEMBER                          IS_RECOVERY_DEST_FILE
---------- ------- ------- ------------------------------- ------------------------
         7         ONLINE  /oradata/orcl/redo07a.log       NO
         7         ONLINE  /oradata/orcl/redo07b.log       NO
         8         ONLINE  /oradata/orcl/redo08a.log       NO
         8         ONLINE  /oradata/orcl/redo08b.log       NO
         9         ONLINE  /oradata/orcl/redo09a.log       NO
         9         ONLINE  /oradata/orcl/redo09b.log       NO
        10         ONLINE  /oradata/orcl/redo10a.log       NO
        10         ONLINE  /oradata/orcl/redo10b.log       NO
        11         ONLINE  /oradata/orcl/redo11a.log       NO
        11         ONLINE  /oradata/orcl/redo11b.log       NO
        12         ONLINE  /oradata/orcl/redo12a.log       NO
        12         ONLINE  /oradata/orcl/redo12b.log       NO

到此 RAC的新redolog 就增加完了


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