以下的英文来源于Oracle9i Data Guard Concepts and Administration文档的standby redo log一节
It might be necessary to create additional standby log groups on the physical standby database, so that the archival operation has time to complete before the standby redo log is reused by the RFS process.
If the primary database is operating in maximum protection mode and a standby redo log cannot be allocated, the primary database instance might shut down immediately.[/COLOR] If the primary database is operating in maximum protection mode or maximum availability mode, then the primary database might wait for the standby redo log to become available. Therefore, be sure to allocate an adequate number of standby redo logs.
蓝色的话是指“如果主数据库工作于最大保护模式，并且standby重做日志无法被分配，则主数据库就会立刻down掉”，但是红色的话由提到“主数据库工作于最大保护或最大可用性模式，主数据库又会等待standby重做日志再次可用”
我就奇怪了，这个主数据库工作于最大保护模式时，到底down不down？
