InnoDB 將修正 Table Scan 導致的效率低落問題

Mark Callaghan 的 blog 上看到的好消息,新版的 InnoDB 將不會因為 table scan 而導致整個 buffer pool 被清空了:「InnoDB plugin gets better again」。

依照「InnoDB buffer pool can be severely affected by table scans」,增加了 innodb_old_blocks_pctinnodb_old_blocks_time,利用一些設定避免 buffer pool 被大量清空。這個方法不是很完美,但應該是堪用的,在 5.1.41 的 InnoDB Plugin 應該就會看到。

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