max_connections 的真正含义是什么?

What does max_connections really mean?(max_connections 的真正含义是什么?)

问题描述

我正在尝试为 MySQL 和共享主机上所需的资源设置理想的性能设置.

I'm trying to set the ideal performance setup for MySQL and resources needed on a shared hosting.

我的问题是，max_connections 到底是什么意思?

My question is, what does max_connections really mean?

是对服务器发出的唯一并发请求数吗?因此，如果有两个用户，其中 1 个打开 1 个选项卡，另一个打开 4 个选项卡……并且同时按下所有选项卡重新加载，是否会与 MySQL 数据库建立 5 个连接?因此，如果我们将这种情况变成:10 个有 2 个标签的人和 31 个有一个标签的人同时按下刷新……我们的 max_connections 为 50，每个人都会被锁定吗?

Is it the number of unique concurrent requests made to the server? So if there are two users, 1 with 1 tab open and the other with 4 tabs open... and both press all their tabs to reload at the same time, will there be 5 connections made to the MySQL DB? Consequently, if we bump this scenario to: 10 people with 2 tabs and 31 people with one tab all pressing refresh at the same time... with our max_connections at 50, will everyone get locked out?

我问的原因是因为我想以较低的 max_connections 拍摄以节省内存资源，因为我一直看到该站点进入 CPU 节流模式

The reason I ask is because I want to shoot for low max_connections to be conservative with memory resources since I consistently see the site going into cpu throttling mode

感谢您的帮助

推荐答案

是的，为每个页面打开了一个单独的连接.但是，假设您没有执行任何数据库密集型操作，一旦页面被提供给客户端，连接将是短暂的并自行关闭.

Yes, there is a separate connection opened for each page. However, assuming you're not doing anything database-intensive, the connection will be short-lived and close itself once the page has been served to the client.

如果确实超过了最大连接数，任何后续的连接尝试都将失败.

If you do exceed the maximum number of connections, any subsequent connection attempt will fail.

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