MySQL 服务器内存使用

核心提示： Another approach you may take is to come up with amount of memory you want MySQL Server to consume at peak. This can be easily computed by memory

Another approach you may take is to come up with amount of memory you want MySQL Server to consume at peak. This can be easily computed by memory needed for OS, File Cache and other applications. For 32bit envinronment you also should keep 32bit limits into account and probably limit “mysqld” size to about 2.5GB (exact number depens on a lot of factors). Now you can use “ps aux” to see VSZ - Virtual Memory allocated by MySQL process. You can also look at “Resident Memory” but I find it less helpful as it may down because of swapping - not what you would like to see. Monitor how the value changes so you know memory requirements with current settings and increase/decrease values appropriately.

另外，就是找出MySQL服务器内存消耗的峰值。这很容易就能计算出操作系统所需的内存、文件缓存以及其他应用。在32位环境下，还需要考虑到32位的限制，限制 “mysqld” 的值大约为2.5G（实际上还要考虑到很多其他因素）。现在运行 “ps aux” 命令来查看 VSZ 的值 -- MySQL 进程分配的虚拟内存。也可以查看 “Resident Memory” 的值，不过我想它可能没多大用处，因为它会由于交换而变小 -- 这并不是你想看到的。监视着内存变化的值，就能知道是需要增加/减少当前的内存值了。

Some may say, Hey we want to have 100% guarantee our server will never run out of memory, no matter which queries or users will decide to run. Unfortunately this is as much close to impossible to be impractical. Here is why: