Oracle 联机日志加上Oracle归档日志记录了整个数据库完整的变更信息。是Oracle体系结构中的重要组成部分。因此联机日志的规划也相当重要。但随着业务的增加或当前联机日志文件的大小成为数据库瓶颈之一时，不得不调整联机日志的大小。本文演示了如何调整联机日志的大小。
1、演示环境
sys@CNBO1> select * from v$version where rownum<2; BANNER
----------------------------------------------------------------
Oracle Database 10g Release 10.2.0.3.0 - 64bit Production sys@CNBO1> archive log list;
Database log mode Archive Mode -->已处于归档模式
Automatic archival Enabled
Archive destination /u02/database/CNBO1/archive/
Oldest online log sequence 4881
Next log sequence to archive 4884
Current log sequence 4884 |
2、日志使用情况
sys@CNBO1> @log_stat GROUP# MEMBER SEQUENCE# SIZE_MB STATUS
---------- --------------------------------------------- ---------- ---------- -------
1 /u02/database/CNBO1/redolog/log1aCNBO1.log 4881 20 ACTIVE
1 /u02/database/CNBO1/redolog/log1bCNBO1.log 4881 20 ACTIVE
2 /u02/database/CNBO1/redolog/log2aCNBO1.log 4882 20 ACTIVE
2 /u02/database/CNBO1/redolog/log2bCNBO1.log 4882 20 ACTIVE
3 /u02/database/CNBO1/redolog/log3aCNBO1.log 4883 20 ACTIVE
3 /u02/database/CNBO1/redolog/log3bCNBO1.log 4883 20 ACTIVE
4 /u02/database/CNBO1/redolog/log4aCNBO1.log 4884 20 ACTIVE
4 /u02/database/CNBO1/redolog/log4bCNBO1.log 4884 20 CURRENT 8 rows selected. sys@CNBO1> select group#,archived,status from v$log; GROUP# ARC STATUS
---------- --- ----------------
1 YES ACTIVE
2 YES ACTIVE
3 YES ACTIVE
4 NO CURRENT |
