Oracle 數(shù)據(jù)庫安裝之后，重做日志默認(rèn)為 3組，如果需要新增刪除，可以通過以下方式！
查詢：
set line222 col member for a60select a.group#,b.member member,a.bytes/1024/1024 "size(M)" from v$log a,v$logfile b where a.group#=b.group#;
新增：
單機(jī)數(shù)據(jù)庫：
alter database add logfile group 4 '/oradata/orcl/redo04.log' size 50M;alter database add logfile group 5 '/oradata/orcl/redo05.log' size 50M;alter database add logfile group 16 '/oradata/orcl/redo16.log' size 1024M;alter database add logfile group 17 '/oradata/orcl/redo17.log' size 1024M;alter database add logfile group 18 '/oradata/orcl/redo18.log' size 1024M;
RAC集群數(shù)據(jù)庫：
alter database add logfile thread 1 group 4 '/oradata/orcl/redo04.log' size 50M,group 5 '/oradata/orcl/redo05.log' size 50M,group 6 '/oradata/orcl/redo06.log' size 50M;alter database add logfile thread 2group 7 '/oradata/orcl/redo07.log' size 50M,group 8 '/oradata/orcl/redo08.log' size 50M,group 9 '/oradata/orcl/redo09.log' size 50M;
刪除：
alter database drop logfile group 16; alter database drop logfile group 17; alter database drop logfile group 18;
?? 注意：如果當(dāng)前要刪除的 logfile 狀態(tài)不是 INACTIVE，那么刪除會報錯，需要執(zhí)行 ALTER SYSTEM SWITCH LOGFILE; 來切換日志，直到狀態(tài)為 INACTIVE 才可以刪除！
本次分享到此結(jié)束啦~
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