MySQL是现在最流行的开放源代码数据库.绝大多数PHP网站的数据库后台都是采用这一数据库.是一个多线程的,结构化查询语言(SQL)数据库服务器。
MySQL 的执行性能非常高,运行速度非常快,并非常容易使用，是一个非常捧的数据库。
features:
A broad subset of ANSI SQL 99, as well as extensions
Cross-platform support
Stored procedures
Triggers
updatable Views
True VARCHAR support
INFORMATION_SCHEMA
Strict mode
X/Open XA distributed transaction processing (DTP) support; two phase commit as part of this, using Oracle"s InnoDB engine
Independent storage engines (MyISAM for read speed, InnoDB for transactions and referential integrity, Archive for storing historical data in little space)
Transactions with the InnoDB, BDB and Cluster storage engines; savepoints with InnoDB
SSL support
Query caching
Sub-SELECTs (i.e. nested SELECTs)
Replication with one master per slave, many slaves per master, no automatic support for multiple masters per slave.
Full-text indexing and searching using MyISAM engine
Embedded database library
Full Unicode support
ACID compliance using the InnoDB, BDB and Cluster engines
Shared-nothing clustering through MySQL Cluster
官网：http://www.mysql.com
v5.0.51b 官方下载：
http://mysql.mirrors.pair.com/Downloads/MySQL-5.0/mysql-essential-5.0.51b-win32.msi
v5.1.2.4 RC 官方下载：
http://mysql.mirrors.pair.com/Downloads/MySQL-5.1/mysql-essential-5.1.24-rc-win32.msi
v6.0.4 Alpha 官方下载：
http://mysql.mirrors.pair.com/Downloads/MySQL-6.0/mysql-6.0.4-alpha-win32.zip
