添加 redolog 组成员

查询当前状态redolog

SQL> select group#,sequence#,bytes,members,status from v$log;

GROUP# SEQUENCE# BYTES MEMBERS STATUS

1 61 52428800 1 INACTIVE
2 64 52428800 1 CURRENT
3 0 52428800 1 UNUSED

SQL> alter database add logfile member 'D:\oracle\oradata\test\REDO03_B.log' to group 3;
Database altered.

SQL> select * from v$logfile;

GROUP# STATUS TYPE MEMBER IS_
------- ------- ---
3 ONLINE D:\ORACLE\ORADATA\TEST\REDO03.LOG NO
2 ONLINE D:\ORACLE\ORADATA\TEST\REDO02.LOG NO
1 ONLINE D:\ORACLE\ORADATA\TEST\REDO01.LOG NO
3 INVALID ONLINE D:\ORACLE\ORADATA\TEST\REDO03_B.LOG NO

SQL> select group#,sequence#,bytes,members,status from v$log;

GROUP# SEQUENCE# BYTES MEMBERS STATUS

1 61 52428800 1 INACTIVE
2 64 52428800 1 CURRENT
3 0 52428800 2 UNUSED

切换logfile到第三组；
SQL> alter system switch logfile ;
System altered.

SQL> select group#,sequence#,bytes,members,status from v$log;

GROUP# SEQUENCE# BYTES MEMBERS STATUS

1 61 52428800 1 INACTIVE
2 64 52428800 1 ACTIVE
3 65 52428800 2 CURRENT

将redolog日志归档

SQL> alter system checkpoint;
System altered.

SQL> select group#,sequence#,bytes,members,status from v$log;

GROUP# SEQUENCE# BYTES MEMBERS STATUS

1 61 52428800 1 INACTIVE
2 64 52428800 1 INACTIVE
3 65 52428800 2 CURRENT

为前两组添加组成员

SQL> alter database add logfile member 'D:\oracle\oradata\test\REDO01_B.log' to group 1;
Database altered.

SQL> alter database add logfile member 'D:\oracle\oradata\test\REDO02_B.log' to group 2;
Database altered.

SQL> select group#,member from v$logfile;

GROUP# MEMBER

3 D:\ORACLE\ORADATA\TEST\REDO03.LOG
2 D:\ORACLE\ORADATA\TEST\REDO02.LOG
1 D:\ORACLE\ORADATA\TEST\REDO01.LOG
3 D:\ORACLE\ORADATA\TEST\REDO03_B.LOG
1 D:\ORACLE\ORADATA\TEST\REDO01_B.LOG
2 D:\ORACLE\ORADATA\TEST\REDO02_B.LOG

6 rows selected.

SQL> select * from v$logfile;

GROUP# STATUS TYPE MEMBER IS_
------- ------- ---
3 ONLINE D:\ORACLE\ORADATA\TEST\REDO03.LOG NO
2 ONLINE D:\ORACLE\ORADATA\TEST\REDO02.LOG NO
1 ONLINE D:\ORACLE\ORADATA\TEST\REDO01.LOG NO
3 ONLINE D:\ORACLE\ORADATA\TEST\REDO03_B.LOG NO
1 INVALID ONLINE D:\ORACLE\ORADATA\TEST\REDO01_B.LOG NO
2 INVALID ONLINE D:\ORACLE\ORADATA\TEST\REDO02_B.LOG NO

6 rows selected.

SQL> alter system switch logfile;
System altered.

SQL> alter system switch logfile;
System altered.

SQL> select * from v$logfile;

GROUP# STATUS TYPE MEMBER IS_
------- ------- ---
3 ONLINE D:\ORACLE\ORADATA\TEST\REDO03.LOG NO
2 ONLINE D:\ORACLE\ORADATA\TEST\REDO02.LOG NO
1 ONLINE D:\ORACLE\ORADATA\TEST\REDO01.LOG NO
3 ONLINE D:\ORACLE\ORADATA\TEST\REDO03_B.LOG NO
1 ONLINE D:\ORACLE\ORADATA\TEST\REDO01_B.LOG NO
2 ONLINE D:\ORACLE\ORADATA\TEST\REDO02_B.LOG NO

6 rows selected.

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