Amazon RDS 可用内存不足.我应该担心吗? [英] Amazon RDS running out of freeable memory. Should I be worried?

问题描述

我有一个 Amazon RDS 实例.自设置以来 1-2​​ 周以来，可用内存一直在下降，从 15GB 的内存下降到大约 250MB.由于它在最后几天下降到如此低的水平，它开始类似于锯齿模式，其中可用内存下降到这个范围 (250 - 350MB)，然后以锯齿模式回升到 500 - 600MB.

I have an Amazon RDS instance. Freeable Memory has been declining since setup over 1-2 weeks, starting from 15GB of memory down to about 250MB. As it has dropped this low in the last days, it has started to resemble a sawtooth pattern where Freeable Memory drops to this range (250 - 350MB) and then goes back up agin to 500 - 600MB in a sawtooth pattern.

应用程序质量没有任何显着下降.但是，我担心数据库会耗尽内存并崩溃.

There has not been any notable decline in application quality. However, I am worried that the DB will run out of memory and crash.

RDS实例是否存在内存不足的危险?是否应该查看一些设置或参数来确定实例是否设置正确?是什么导致了这种锯齿图案?

Is there a danger that the RDS instance will run out of memory? Is there some setting or parameter I should be looking at to determine if the instance is set up correctly? What is causing this sawtooth pattern?

推荐答案

Freeable memory 字段被 MySQL 用于缓冲和缓存它自己的进程.Freeable 内存量随着时间的推移而减少是正常的.我不会担心它会删除旧信息，因为它需要更多空间.

Freeable memory field is used by MySQL for buffering and caching for it`s own processes. It is normal for the amount of Freeable memory to decrease over time. I wouldn't be worried it kicks old info out as it demands more room.

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