最近phpwind升级8.7后，经常出现宕机的现象，不是Apache卡死，吃光内存机器重启，就是mysql数据库被锁，无奈！

多个原因，apache的版本过低，导致执行效率慢；另外数据库版本过低，查询语句多时，自动锁！网站几乎不能访问！另外就是程序可能也有点问题，测试页面可以正常访问！主页却不能打开！

把apache升级到2.2版本，程序转移到了另一台机器上，搭建LAMP环境，用于编译php， 已经安装好了mysql！  试着运行，发现机器运行正常，无负载超高的现象，可是网站还是会卡，数据库还是会锁死！

联系到phpwind官方寻找技术支持，的确有bug，官方同意帮我们解决！

我们也考虑到把数据版本也升级下，由于机器暂时紧缺，只能在程序上搭建，一条船上前线，哈哈！

采用二进制文件安装mysql

初始化正常，添加mysql服务，可是启动的时候出现问题了

[root@localhost scripts]# /usr/local/mysql5.0.45/bin/mysqld_safe --defaults-file=/etc/my.cnf  --user=mysql  &

[1] 31358

[root@localhost scripts]# The file /usr/local/mysql/bin/mysqld doesn't exist or is not executable

Please do a cd to the mysql installation directory and restart

this script from there as follows:

./bin/mysqld_safe.

See http://dev.mysql.com/doc/mysql/en/mysqld_safe.html for more

information

\

[1]+  Exit 1                  /usr/local/mysql5.0.45/bin/mysqld_safe --defaults-file=/etc/my.cnf --user=mysql

查看了很多资料，最终还是官方的文档给力：

5. Change location into the installation directory:

shell> cd mysql

You will find several files and subdirectories in the `mysql'

directory. The most important for installation purposes are the

`bin' and `scripts' subdirectories:

* The `bin' directory contains client programs and the server.

You should add the full pathname of this directory to your

`PATH' environment variable so that your shell finds the MySQL

programs properly. See *Note environment-variables::.

* The `scripts' directory contains the `mysql_install_db'

script used to initialize the `mysql' database containing the

grant tables that store the server access permissions.

6. Ensure that the distribution contents are accessible to `mysql'.

If you unpacked the distribution as `mysql', no further action is

required. If you unpacked the distribution as `root', its contents

will be owned by `root'. Change its ownership to `mysql' by

executing the following commands as `root' in the installation

directory:

shell> chown -R mysql .

shell> chgrp -R mysql .

The first command changes the owner attribute of the files to the

`mysql' user. The second changes the group attribute to the

`mysql' group.

7. If you have not installed MySQL before, you must create the MySQL

data directory and initialize the grant tables:

shell> scripts/mysql_install_db --user=mysql

If you run the command as `root', include the `--user' option as

shown. If you run the command while logged in as that user, you

can omit the `--user' option.

The command should create the data directory and its contents with

`mysql' as the owner.

After creating or updating the grant tables, you need to restart

the server manually.

8. Most of the MySQL installation can be owned by `root' if you like.

The exception is that the data directory must be owned by `mysql'.

To accomplish this, run the following commands as `root' in the

installation directory:

shell> chown -R root .

shell> chown -R mysql data

9. If you want MySQL to start automatically when you boot your

machine, you can copy `support-files/mysql.server' to the location

where your system has its startup files. More information can be

found in the `support-files/mysql.server' script itself and in

*Note automatic-start::.

我之前执行的是   chown -R mysql：mysql  .

官方： shell> chown -R root .

shell> chown -R mysql data

最后修正重启：

[root@localhost mysql5.0.45]# chown -R root .

[root@localhost mysql5.0.45]# chown -R mysql data

[root@localhost mysql5.0.45]# ./bin/mysqld_safe --user=mysql &

[1] 31480

[root@localhost mysql5.0.45]# Starting mysqld daemon with databases from /mysqldata

关闭重启：

[root@localhost mysql5.0.45]# /usr/local/mysql5.0.45/bin/mysqladmin  -u root  shutdown

STOPPING server from pid file /mysqldata/localhost.localdomain.pid

110928 10:49:34  mysqld ended

[1]+  Done                    ./bin/mysqld_safe --user=mysql

[root@localhost mysql5.0.45]# ./bin/mysqld_safe --user=mysql &

[1] 31654

[root@localhost mysql5.0.45]# Starting mysqld daemon with databases from /mysqldata

正常！ok

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