GROUP# SIZE_M STATUS ARC
---------- ---------- ---------------- ---
3 50 INACTIVE YES
4 100 ACTIVE YES
5 100 CURRENT NO
6 100 UNUSED YES
SYS@ORCL>alter database drop logfile group 3;
Database altered.
SYS@ORCL>select GROUP# ,BYTES/1024/1024 size_M,STATUS,ARCHIVED from v$log;
GROUP# SIZE_M STATUS ARC
---------- ---------- ---------------- ---
4 100 ACTIVE YES
5 100 CURRENT NO
6 100 UNUSED YES
4.向新创建的日志组添加成员
注意： 若在生产库中，则将新创建的成员放到不同的磁盘上
SYS@ORCL>alter system switch logfile;
System altered.
SYS@ORCL>select GROUP# ,BYTES/1024/1024 size_M,STATUS,ARCHIVED from v$log;
GROUP# SIZE_M STATUS ARC
---------- ---------- ---------------- ---
4 100 ACTIVE YES
5 100 ACTIVE YES
6 100 CURRENT NO
SYS@ORCL>alter system switch logfile;
System altered.
SYS@ORCL>select GROUP# ,BYTES/1024/1024 size_M,STATUS,ARCHIVED from v$log;
GROUP# SIZE_M STATUS ARC
---------- ---------- ---------------- ---
4 100 CURRENT NO
5 100 ACTIVE YES
6 100 ACTIVE YES
SYS@ORCL>alter database add logfile member'/u01/app/oracle/oradata/ORCL/onlinelog/redo06_b.log' to group 6;
Database altered.
SYS@ORCL>select GROUP#,members,BYTES/1024/1024 size_M,STATUS,ARCHIVED from v$log;