-- 2009-2-10 17:14
-- 調整Online Redo Logs大小(Resizing Oracle Online Redo Logs)

1.查詢當前的日誌設定情況
sys@ora10g> col MEMBER for a40
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.新增兩個臨時日誌組
sys@ora10g> alter database add logfile group 4 ('/u01/app/oracle/oradata/ORA10G/redo04.log') size 200M;
sys@ora10g> alter database add logfile group 5 ('/u01/app/oracle/oradata/ORA10G/redo05.log') size 200M;

3.將當前使用的Online Redo Log切換到新增的Redo log group上
sys@ora10g> alter system switch logfile;
sys@ora10g> alter system switch logfile;

4.檢查是否已經切換到新增的Online Redo log group上:
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

3.刪除原來的Online 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;

4.作業系統下刪除原日誌組1、2、3中的檔案

5.透過新增新的redo檔案修改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') size 200M;
sys@ora10g> alter database add logfile group 2 ('/u01/app/oracle/oradata/ORA10G/redo02_01.log','/u01/app/oracle/oradata/ORA10G/redo02_02.log') size 200M;
sys@ora10g> alter database add logfile group 3 ('/u01/app/oracle/oradata/ORA10G/redo03_01.log','/u01/app/oracle/oradata/ORA10G/redo03_02.log') size 200M;

6.將目前使用的Online Redo Log切換到剛剛新增的Redo log group
sys@ora10g> alter system switch logfile;
sys@ora10g> alter system switch logfile;
sys@ora10g> alter system switch logfile;

7.刪除過度時期的Online Redo Logs。
sys@ora10g> alter database drop logfile group 4;
sys@ora10g> alter database drop logfile group 5;

8.作業系統下刪除原日誌組4、5中的檔案

9.檢查調整後的的結果:
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.記得調整後Control file備份下來, 並Reset Log。
sys@ora10g> alter database backup controlfile to trace resetlogs;

-- The End --

【操作】調整Online Redo Logs大小(Resizing Oracle Online Redo Logs)

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