Read Cache: Percentage of times the page should be read from the buffer pool.
Read Cache:应该从缓冲区池读取的页面百分比。
Read cache hits should be in excess of 99 percent, and we would like write cache hits to be above 95 percent.
读命中率应超过 99%,写缓存命中率最好达到 95% 左右。
We cannot pay attention to read cache hit rate since we have been sequentially scanning a huge table over and over.
由于我们一遍又一遍地顺序扫描一个巨大的表,这样我们就无法关注读缓存命中率。
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