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MAXIMUM PERFORMANCE mode in ora92_arc0_1252.trc

原创 Oracle 作者:davies 时间:2007-09-10 17:28:44 0 删除 编辑

系统是 9iR2 的 DataGuard . 今天 Data Guard 主库BDUMP 目录下产生包含如下内容的trace 文件:

......
Destination LOG_ARCHIVE_DEST_2 is in MAXIMUM PERFORMANCE mode
Destination LOG_ARCHIVE_DEST_2 is in CLUSTER CONSISTENT mode
Destination LOG_ARCHIVE_DEST_2 is in MAXIMUM PERFORMANCE mode
Destination LOG_ARCHIVE_DEST_2 is in CLUSTER CONSISTENT mode
Destination LOG_ARCHIVE_DEST_2 is in MAXIMUM PERFORMANCE mode
......
网上搜索了一下 从DBA notes

This message indicates that the LGWR is sending archivelogs to the standby database from a primary database that is in "cluster consistency" mode. This means that information maintained in the archivelogs is used for thread merging during failover to correctly synchronize the standby database to a transactionally consistent point-in-time. This is especially important when using asynchronous network transmittal, as thread merging of asynchronously transmitted archivelogs is very difficult.
This message has nothing to do with whether or not you actually have a standby database.
This message indicates the redo is being setup in case you have a standby database.
参见Metalink Note:214986.1

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