SQL> SELECT * FROM v$logfile;

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GROUP# STATUS  TYPE

---

MEMBER

IS_ CON_ID

---

 3     ONLINE

+DATA/JY/ONLINELOG/group_3.264.968770057
NO 0

 2     ONLINE

+DATA/JY/ONLINELOG/group_2.263.968770045
NO 0

GROUP# STATUS  TYPE

---

MEMBER

IS_ CON_ID

---

 1     ONLINE

+DATA/JY/ONLINELOG/group_1.262.968770045
NO 0

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

GROUP# STATUS

---

 1 INACTIVE
 2 INACTIVE
 3 CURRENT

SQL> alter database add logfile member '+REDO','+ARCH' to group 1;

Database altered.

SQL> alter database add logfile member '+REDO','+ARCH' to group 2;

Database altered.

SQL> alter database add logfile member '+REDO','+ARCH' to group 3;

Database altered.

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

GROUP# STATUS

---

 1 INACTIVE
 2 INACTIVE
 3 CURRENT

SQL> alter system switch logfile;

System altered.

SQL> alter database drop logfile member '+DATA/JY/ONLINELOG/group_1.262.968770045';

Database altered.

SQL> alter system switch logfile;

System altered.

SQL> alter database drop logfile member '+DATA/JY/ONLINELOG/group_2.263.968770045';

Database altered.

SQL> alter system switch logfile;

System altered.
SQL> alter database drop logfile member '+DATA/JY/ONLINELOG/group_3.264.968770057';

Database altered.

SQL> select a.group#,a.bytes/1024/1024 mb,b.member from v$log a,v$logfile b where a.group#=b.group#;

GROUP#     MB

---

MEMBER

 1    200

+REDO/JY/ONLINELOG/group_1.256.968854893

 1    200

+ARCH/JY/ONLINELOG/group_1.256.968854895

 2    200

+REDO/JY/ONLINELOG/group_2.257.968854901

GROUP#     MB

---

MEMBER

 2    200

+ARCH/JY/ONLINELOG/group_2.257.968854903

 3    200

+REDO/JY/ONLINELOG/group_3.258.968854907

 3    200

+ARCH/JY/ONLINELOG/group_3.258.968854909

6 rows selected.

分享題目：ORACLE12CDG下redo遷移
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