日志文件管理

创建日志组

ALTER DATABASE

ADD LOGFILE ('/oracle/dbs/log1c.rdo', '/oracle/dbs/log2c.rdo') SIZE 100M;

ALTER DATABASE

ADD LOGFILE GROUP 10 ('/oracle/dbs/log1c.rdo', '/oracle/dbs/log2c.rdo')

SIZE 100M BLOCKSIZE 512;

创建日志成员

ALTER DATABASE ADD LOGFILE MEMBER '/oracle/dbs/log2b.rdo' TO GROUP 2;

重命名日志

1.shutdown immediate

2.重命名

3.启动到mount状态

4. ALTER DATABASE

RENAME FILE '/diska/logs/log1a.rdo', '/diska/logs/log2a.rdo'

TO '/diskc/logs/log1c.rdo', '/diskc/logs/log2c.rdo';

5. ALTER DATABASE OPEN;

删除日志组和日志文件

该日志组必须在inactive状态，确保该日志已经被归档。

查看是否已归档

SELECT GROUP#, ARCHIVED, STATUS FROM V$LOG;

GROUP# ARC STATUS

--------- --- ----------------

1 YES ACTIVE

2 NO CURRENT

3 YES INACTIVE

4 YES INACTIVE

删除

ALTER DATABASE DROP LOGFILE GROUP 3; 删除日志组

ALTER DATABASE DROP LOGFILE MEMBER '/oracle/dbs/log3c.rdo'; 删除日志文件

该文件只是从数据库中被删除，并没有被操作系统真正删除，依然存在磁盘上。

日志切换

ALTER SYSTEM SWITCH LOGFILE;

初始化日志文件

ALTER DATABASE CLEAR LOGFILE GROUP 3;

归档管理

开启自动归档模式

1. STARTUP MOUNT 启动到mount模式

2. ALTER DATABASE ARCHIVELOG;

3. ALTER DATABASE OPEN;

开启手动归档

1. STARTUP MOUNT 启动到mount模式

2. ALTER DATABASE ARCHIVELOG MANUAL;开启手动归档

3. ALTER DATABASE OPEN;

4. ALTER SYSTEM ARCHIVE LOG ALL;手动归档已满的日志文件

设置归档路径

配置LOG_ARCHIVE_DEST_n参数（n的取值为1-31），可以配置多个位置。

alter system set log_archive_dest_1='location=/u01/app/oracle/arch1';

alter system set log_archive_dest_2='location=/u01/app/oracle/arch2';

查看归档信息

ARCHIVE LOG LIST

SQL> ARCHIVE LOG LIST

Database log mode Archive Mode

Automatic archival Enabled

Archive destination D:\oracle\oradata\IDDB2\archive

Oldest online log sequence 11160

Next log sequence to archive 11163

Current log sequence 11163