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MYSQL 运作一小段时间后，速度变得奇慢。而CPU基本空闲状态

www.myexceptions.net  网友分享于：2015-08-26  浏览：11次

MYSQL 运行一小段时间后，速度变得奇慢。而CPU基本空闲状态！

【运行环境】：

WIN 2003 + APACHE2.2 + PHP5 + MYSQL 5.1.54

【服务器配置】：双核2.2G主频；1.5G内存；150G硬盘

【数据库情况】：

1. INNODB，ibdata 有30G

2. 有近2万张表，表的字段比较少(基本上10几个字段，最多有40个字段)；

3. 大部分表的记录数，不超过3万条；只有个别表的记录有百万条的数量级。

【数据库使用情况】：

1. 连接只有几十个，其中，有几个连接是后台守护程序在用，查询和写入的频率很高(类似实时系统)。

【问题描述】：

1. 在MYSQL控制台下面，不管是什么操作(查询/更新)，都非常慢(一张1万条记录的用户表，查记录数都要几秒~几十秒)。而此种情况下：mysqld占用约500M内存，CPU基本上都是2%(好像不工作)。重启MYSQL后，稍微好一点，但不一会，又开始很慢。

对比：最奇怪的是，之前的速度比较正常，mysqld 占用约500M内存，CPU占用50%，MYSQL查询速度比较OK(都是0.0X秒)。

我是MYSQL菜鸟，请大虾指教，是什么原因？

附：MYSQL配置：

# MySQL Server Instance Configuration File

# ----------------------------------

# Generated by the MySQL Server Instance Configuration Wizard

#

#

# Installation Instructions

# ----------------------------------

#

# On Linux you can copy this file to /etc/my.cnf to set global options,

# mysql-data-dir/my.cnf to set server-specific options

# (@localstatedir@ for this installation) or to

# ~/.my.cnf to set user-specific options.

#

# On Windows you should keep this file in the installation directory

# of your server (e.g. C:\Program Files\MySQL\MySQL Server X.Y). To

# make sure the server reads the config file use the startup option

# "--defaults-file".

#

# To run run the server from the command line, execute this in a

# command line shell, e.g.

# mysqld --defaults-file="C:\Program Files\MySQL\MySQL Server X.Y\my.ini"

#

# To install the server as a Windows service manually, execute this in a

# command line shell, e.g.

# mysqld --install MySQLXY --defaults-file="C:\Program Files\MySQL\MySQL Server X.Y\my.ini"

#

# And then execute this in a command line shell to start the server, e.g.

# net start MySQLXY

#

#

# Guildlines for editing this file

# ----------------------------------

#

# In this file, you can use all long options that the program supports.

# If you want to know the options a program supports, start the program

# with the "--help" option.

#

# More detailed information about the individual options can also be

# found in the manual.

#

#

# CLIENT SECTION

# ----------------------------------

#

# The following options will be read by MySQL client applications.

# Note that only client applications shipped by MySQL are guaranteed

# to read this section. If you want your own MySQL client program to

# honor these values, you need to specify it as an option during the

# MySQL client library initialization.

#

[client]

port=3306

[mysql]

default-character-set=utf8

# SERVER SECTION

# ----------------------------------

#

# The following options will be read by the MySQL Server. Make sure that

# you have installed the server correctly (see above) so it reads this

# file.

#

[mysqld]

skip-name-resolve

# The TCP/IP Port the MySQL Server will listen on

port=3306

#Path to installation directory. All paths are usually resolved relative to this.

basedir="C:/Program Files/MySQL/MySQL Server 5.1/"

#Path to the database root

datadir="D:\Programs\MYSQL\data"

# The default character set that will be used when a new schema or table is

# created and no character set is defined

default-character-set=utf8

# The default storage engine that will be used when create new tables when

default-storage-engine=INNODB

# Replication Master Server (default)

# binary logging is required for replication

log-bin=mysql-bin

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