由网友(迢迢星万里)分享简介：我有一个Amazon RDS实例。 Freeable内存一直在下降，因为设置了1-2周，从内存15GB开始下降到约250MB。因为它已经降到如此低的最后日子里，它已经开始像锯齿图案，其中Freeable内存下降到这个范围内（250 - 350 MB），然后又回到了阿恩500 - 600MB的锯齿图案。 I h...

我有一个Amazon RDS实例。 Freeable内存一直在下降，因为设置了1-2周，从内存15GB开始下降到约250MB。因为它已经降到如此低的最后日子里，它已经开始像锯齿图案，其中Freeable内存下降到这个范围内（250 - 350 MB），然后又回到了阿恩500 - 600MB的锯齿图案。

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.

目前还没有在应用程序质量的显着下降。不过，我担心的数据库将耗尽内存和崩溃。

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

有一种危险，即RDS实例将运行内存不足？有一些设置或参数，我应该看，以确定是否实例设置正确？是什么原因造成这种锯齿纹？

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内存领域是用于缓冲和缓存为它`自己的过程中使用由MySQL。这是正常的Freeable内存量随时间而减少。我不会担心这老踢出来的信息，因为它需要更多的空间。

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.