Oracle關于日志文件基本操作

1.查詢系統使用的是哪一組日志文件：
select * from v$log;

2.查詢正在使用的組所對應的日志文件：
select * from v$logfile;

3.強制日志切換：
alter system switch logfile;

4.查詢歷史日志：
select * from v$log_history;
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5.查詢日志的歸檔模式：
select dbid,name,created,log_mode from v$database;

6.查詢歸檔日志的信息：
select recid,stamp,thread#,sequence#,name from v$archived_log;

7.增加與刪除日志文件組
alter database add logfile group 1 ('/home1/Oracle/oradata/ora8i/log1a.log'),'/home2/oracle/oradata/ora8i/log1b.log') size 100M;

alter database drop logfile group 1;

8.增加與刪除日志成員
alter database add logfile member '/home1/Oracle/oradata/ora8i/log1a.log' to group 1,'/home1/oracle/oradata/ora8i/log2a.log' to group 2;

alter database drop logfile member '/home1/Oracle/oradata/ora8i/log1a.log' ;

9.日志文件移動
alter database rename file '/home1/Oracle/oradata/ora8i/log1a.log' to '/home2/oracle/oradata/ora8i/log1a.log';
執行該命令之前必須保證該日志文件物理上已經移動到新目錄

10.清除日志文件
alter database clear logfile '/home1/Oracle/oradata/ora8i/log1a.log';
該命令用于不能用刪除組及組成員命令刪除日志時使用

8.查看歸檔日志占用空間：
SELECT space_limit/1024/1024/1024 AS "Quota_G",space_used/1024/1024 AS "Used_M",space_used/space_limit*100 "Used_%",space_reclaimable AS reclaimable,number_of_files AS files FROM v$recovery_file_dest ;

9.修改歸檔日志空間大小
alter system set DB_RECOVERY_FILE_DEST_SIZE=40g;

10.查看歸檔日志列表
RMAN> list archivelog all;
刪除歸檔日志
RMAN> delete archivelog until time 'sysdate-1' ;
雙機下也可以用
delete obsolete;
crosscheck archivelog all;
delete expired archivelog all;

11. 用list expired看看是否有失效的archive log,證明沒有失效的archive log:
RMAN> list expired archivelog all;

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