為oracle新增重做日誌組及重做日誌成員

jane_pop發表於2014-09-09
Oracle
新增重做日誌組：
SYS@orcl 08-SEP-14>select group#,type,member from v$logfile;

 GROUP# TYPE    MEMBER
------- ------- --------------------------------------------------
      3 ONLINE  /u01/app/oracle/oradata/orcl/redo03.log
      2 ONLINE  /u01/app/oracle/oradata/orcl/redo02.log
      1 ONLINE  /u01/app/oracle/oradata/orcl/redo01.log

SYS@orcl 08-SEP-14>alter database add logfile group 4
  2  ('/u01/app/oracle/oradata/orcl/redo04.log')
  3  size 50m;

SYS@orcl 08-SEP-14>select group#,sequence#,bytes/1024/1024||'MB',status from v$log;


 GROUP#  SEQUENCE# BYTES/1024/1024||'MB'                      STATUS
------- ---------- ------------------------------------------ ----------------
      1         25 50MB                                       CURRENT
      2         23 50MB                                       INACTIVE
      3         24 50MB                                       INACTIVE
      4          0 50MB                                        UNUSED

為日誌組新增成員：
SYS@orcl 09-SEP-14>select group#,status,member from v$logfile;


 GROUP# STATUS  MEMBER
------- ------- --------------------------------------------------
      3         /u01/app/oracle/oradata/orcl/redo03.log
      2         /u01/app/oracle/oradata/orcl/redo02.log
      1         /u01/app/oracle/oradata/orcl/redo01.log
      4         /u01/app/oracle/oradata/orcl/redo04.log

SYS@orcl 09-SEP-14>alter database add logfile member
  2  '/u01/app/redolog/redo01a.log' to group 1,
  3  '/u01/app/redolog/redo02a.log' to group 2,
  4  '/u01/app/redolog/redo03a.log' to group 3,
  5  '/u01/app/redolog/redo04a.log' to group 4;

Database altered.



SYS@orcl 09-SEP-14>select group#,status,member,type from v$logfile;


 GROUP# STATUS  MEMBER                                             TYPE
------- ------- -------------------------------------------------- -------
      3         /u01/app/oracle/oradata/orcl/redo03.log            ONLINE
      2         /u01/app/oracle/oradata/orcl/redo02.log            ONLINE
      1         /u01/app/oracle/oradata/orcl/redo01.log            ONLINE
      4         /u01/app/oracle/oradata/orcl/redo04.log            ONLINE
      1 INVALID /u01/app/redolog/redo01a.log                       ONLINE
      2 INVALID /u01/app/redolog/redo02a.log                       ONLINE
      3 INVALID /u01/app/redolog/redo03a.log                       ONLINE
      4 INVALID /u01/app/redolog/redo04a.log                       ONLINE

8 rows selected.


切換日誌四次之後，狀態為invalid的日誌組成員變為null。
SYS@orcl 09-SEP-14>select group#,status,member,type from v$logfile;


 GROUP# STATUS  MEMBER                                             TYPE
------- ------- -------------------------------------------------- -------
      3         /u01/app/oracle/oradata/orcl/redo03.log            ONLINE
      2         /u01/app/oracle/oradata/orcl/redo02.log            ONLINE
      1         /u01/app/oracle/oradata/orcl/redo01.log            ONLINE
      4         /u01/app/oracle/oradata/orcl/redo04.log            ONLINE
      1         /u01/app/redolog/redo01a.log                       ONLINE
      2         /u01/app/redolog/redo02a.log                       ONLINE
      3         /u01/app/redolog/redo03a.log                       ONLINE
      4         /u01/app/redolog/redo04a.log                       ONLINE

8 rows selected.

刪除日誌組成員：(注意，如果這個組裡面只有唯一的一個成員，那麼是不能刪除的)
SYS@orcl 09-SEP-14>alter database drop logfile member
  2  '/u01/app/redolog/redo01a.log',
  3  '/u01/app/redolog/redo02a.log',
  4  '/u01/app/redolog/redo03a.log',
  5  '/u01/app/redolog/redo04a.log';
alter database drop logfile member
*
ERROR at line 1:
ORA-01609: log 1 is the current log for thread 1 - cannot drop members
ORA-00312: online log 1 thread 1: '/u01/app/oracle/oradata/orcl/redo01.log'
ORA-00312: online log 1 thread 1: '/u01/app/redolog/redo01a.log'

可以看到例項正在使用的redo log是不能刪除的，於是我們先刪除其他組的成員：
SYS@orcl 09-SEP-14>alter database drop logfile member
  2  '/u01/app/redolog/redo02a.log',
  3  '/u01/app/redolog/redo03a.log',
  4  '/u01/app/redolog/redo04a.log';

Database altered.

接著，我們再切換日誌：
SYS@orcl 09-SEP-14>select group#,sequence#,status from v$log;

 GROUP#  SEQUENCE# STATUS
------- ---------- ----------------
      1         29 CURRENT
      2         27 INACTIVE
      3         28 INACTIVE
      4         26 INACTIVE

SYS@orcl 09-SEP-14>alter system switch logfile;


System altered.


SYS@orcl 09-SEP-14>select group#,sequence#,status from v$log;


 GROUP#  SEQUENCE# STATUS
------- ---------- ----------------
      1         29 ACTIVE
      2         27 INACTIVE
      3         28 INACTIVE
      4         30 CURRENT

再刪除日誌組1的成員redo01a.log:
SYS@orcl 09-SEP-14>alter database drop logfile member
  2  '/u01/app/redolog/redo01a.log';

Database altered.

檢視日誌組及日誌組成員資訊：
SYS@orcl 09-SEP-14>select group#,status,type,member from v$logfile;


 GROUP# STATUS  TYPE    MEMBER
------- ------- ------- --------------------------------------------------
      3         ONLINE  /u01/app/oracle/oradata/orcl/redo03.log
      2         ONLINE  /u01/app/oracle/oradata/orcl/redo02.log
      1         ONLINE  /u01/app/oracle/oradata/orcl/redo01.log
      4         ONLINE  /u01/app/oracle/oradata/orcl/redo04.log







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