InnoDB 的 buffer pool preload 功能

Percona 的人討論了 InnoDB 提供的 buffer pool preload 功能:「Using the InnoDB Buffer Pool Pre-Load Feature in MySQL 5.7」。

就如同他所講的,因為硬體設備的進步 (主要是 SSD 的興起),而導致 preload 的需求已經沒以前重要了:

Frankly, time has reduced the need for this feature. Five years ago, we would typically store databases on spinning disks. These disks often took quite a long time to warm up with normal database workloads, which could lead to many hours of poor performance after a restart. With the rise of SSDs, warm up happens faster and reduces the penalty from not having data in the buffer pool.

由於 SSD 的 random read 很快,反而可以直接推上線讓他邊跑服務邊 warm up。不過相對的,傳統硬碟的 InnoDB database 還是可以規劃需求,畢竟 random read 還是痛點...

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