今天在检查数据库时，发现alert.log日志文件出现如下错误：

Tue Apr 9 22:03:04 2013

RFS[5]: Archived Log: '/oracle/oradata/SJLY/archivelog/1_552_787256267.dbf'

Primary database is in MAXIMUM PERFORMANCE mode

RFS[5]: No standby redo logfiles created

Tue Apr 9 22:03:06 2013

Media Recovery Log /oracle/oradata/SJLY/archivelog/1_552_787256267.dbf

Media Recovery Waiting for thread 1 sequence 553 (in transit)

Wed Apr 10 08:03:44 2013

RFS[5]: Archived Log: '/oracle/oradata/SJLY/archivelog/1_553_787256267.dbf'

Primary database is in MAXIMUM PERFORMANCE mode

RFS[5]: No standby redo logfiles created

Wed Apr 10 08:03:44 2013

Media Recovery Log /oracle/oradata/SJLY/archivelog/1_553_787256267.dbf

Media Recovery Waiting for thread 1 sequence 554 (in transit)

解决方法：

1、说是日志切换太过频繁，加大日志大小。但是我查看了主库的日志切换，一天也就两次，切换并不频繁。

参考：http://community.dbapool.com/thread.php?forumthread=topic_28090

2、

参考：http://sys-admin.wikidot.com/create-a-physical-standby-database

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