Oracle 调整Online Redo Logs大小

1. 1.查询当前的日志设置情况

sys@ora10g> select * From v$logfile;

    GROUP# STATUS TYPE                 MEMBER                                   IS_
---------- ------- -------------------- ---------------------------------------- ---
         1         ONLINE               /u01/app/oracle/oradata/ORA10G/redo01.log NO
         2         ONLINE               /u01/app/oracle/oradata/ORA10G/redo02.log NO
         3         ONLINE               /u01/app/oracle/oradata/ORA10G/redo03.log NO
sys@ora10g> select * from v$log;

    GROUP#    THREAD# SEQUENCE#      BYTES    MEMBERS ARC STATUS           FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
         1          1      13690   52428800          1 NO CURRENT              192645086 10-FEB-09
         2          1      13689   52428800          1 YES INACTIVE             192633926 10-FEB-09
         3          1      13688   52428800          1 YES INACTIVE             192614912 10-FEB-09

2. 添加两个临时日志组

sys@ora10g> alter database add logfile group 4 ('/u01/app/oracle/oradata/ORA10G/redo04.log') size200M;
sys@ora10g> alter database add logfile group 5 ('/u01/app/oracle/oradata/ORA10G/redo05.log') size200M;

3. 切换日志组

sys@ora10g> alter system switch logfile;
sys@ora10g> alter system switch logfile;

4. 检查是否切换正确

sys@ora10g> select * from v$log;
    GROUP#    THREAD# SEQUENCE#      BYTES    MEMBERS ARC STATUS           FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
         1          1      13695   52428800          1 YES INACTIVE             192653667 10-FEB-09
         2          1      13694   52428800          1 YES INACTIVE             192653616 10-FEB-09
         3          1      13693   52428800          1 YES INACTIVE             192653593 10-FEB-09
         4          1      13696 209715200          1 NO CURRENT              192653673 10-FEB-09
         5          1      13692 209715200          1 YES INACTIVE             192653549 10-FEB-09

5. 删除原来的Redo Logs

sys@ora10g> alter database drop logfile group 1;
sys@ora10g> alter database drop logfile group 2;
sys@ora10g> alter database drop logfile group 3;

6. 通过添加新的redo文件修改redo的大小

sys@ora10g> alter database add logfile group 1 ('/u01/app/oracle/oradata/ORA10G/redo01_01.log','/u01/app/oracle/oradata/ORA10G/redo01_02.log') size200M;
sys@ora10g> alter database add logfile group 2 ('/u01/app/oracle/oradata/ORA10G/redo02_01.log','/u01/app/oracle/oradata/ORA10G/redo02_02.log') size200M;
sys@ora10g> alter database add logfile group 3 ('/u01/app/oracle/oradata/ORA10G/redo03_01.log','/u01/app/oracle/oradata/ORA10G/redo03_02.log') size200M;

7. 再次切换Redo log group

sys@ora10g> alter system switch logfile;
sys@ora10g> alter system switch logfile;
sys@ora10g> alter system switch logfile;

8. 刪除过度时期的Online Redo Logs。

sys@ora10g> alter database drop logfile group 4;
sys@ora10g> alter database drop logfile group 5;

9. 检查调整后的的結果:

sys@ora10g> select * from v$log;
GROUP# THREAD# SEQUENCE#      BYTES MEMBERS ARC STATUS    FIRST_CHANGE# FIRST_TIME
------ ------- ---------- ---------- -------- --- --------- ------------- ----------
     1       1     503599 104857600        1 YES INACTIVE     2625981960 31-MAY-07
     2       1     503600 104857600        1 YES INACTIVE     2626024767 31-MAY-07
     3       1     503601 104857600        1 NO CURRENT      2625936142 31-MAY-07

10. 备份控制文件并Reset Log。

sys@ora10g> alter database backup controlfile to trace resetlogs;

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Oracle 调整Online Redo Logs大小