2.log CURRENT NO
4 4 +DATA/metro/onlinelog/group_4.274.848866 INACTIVE YES
125
2 7 /disk1/metro/redofile/redo02a.log CURRENT NO
5 5 +DATA/metro/onlinelog/group_5.275.848866 INACTIVE YES
171
6 6 +DATA/metro/onlinelog/group_6.276.848866 INACTIVE YES
215
SQL> alter system switch logfile;
--切归档，改变当前日志组
System altered.
SQL> select l.group#,l.sequence#,f.member as name,l.status,l.archived from v$log l,v$logfile f where f.group#=l.group#;
--日志组处于active状态，存在脏块没有写完，暂不可删除日志组2
GROUP# SEQUENCE# NAME STATUS ARC
---------- ---------- ---------------------------------------- ---------------- ---
2 7 /u01/app/oracle/oradata/metro/redo02.log ACTIVE YES
4 8 +DATA/metro/onlinelog/group_4.274.848866 CURRENT NO
125
2 7 /disk1/metro/redofile/redo02a.log ACTIVE YES
5 5 +DATA/metro/onlinelog/group_5.275.848866 INACTIVE YES
171
6 6 +DATA/metro/onlinelog/group_6.276.848866 INACTIVE YES
215
SQL> r
1* select l.group#,l.sequence#,f.member as name,l.status,l.archived from v$log l,v$logfile f where f.group#=l.group#
--几分钟后，再次查看日志状态，日志组2已经将脏块写完，此时可以删除该日志组了
GROUP# SEQUENCE# NAME STATUS ARC
---------- ---------- ---------------------------------------- ---------------- ---
2 7 /u01/app/oracle/oradata/metro/redo02.log INACTIVE YES
4 8 +DATA/metro/onlinelog/group_4.274.848866 CURRENT NO
125
2 7 /disk1/metro/redofile/redo02a.log INACTIVE YES
5 5 +DATA/metro/onlinelog/group_5.275.848866 INACTIVE YES
171
6 6 +DATA/metro/onlinelog/group_6.276.848866 INACTIVE YES
215
SQL> alter database drop logfile group 2;
--删除日志组2
Database altered.
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