redo log active current inactive 区别
2012-10-08 11:28
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Redo log的四种状态(CURRENT、ACTIVE、INACTIVE、UNUSED)浅析 1. CURRENT指当前的日志文件，在进行实例恢复时是必须的； 2. ACTIVE是指活动的非当前日志，在进行实例恢复时会被用到。Active状态意味着，Checkpoint尚未完成，因此该日志文件不能被覆盖。 3. INACTIVE是非活动日志，在实例恢复时不再需要，但在介质恢复时可能需要。 4. UNUSED表示该日志从未被写入，可能是刚添加的，或RESETLOGS后被重置。本文出自 “ItBull” 博客，请务必保留此出处http://itbull.blog.51cto.com/669746/1017731
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