MySQL的MyISAM和InnoDB的大数据量查询性能比较
因为工作关系，有一个超过11亿记录的MySQL数据库，之前一直以为MyISAM引擎的查询性能会超过InnoDB，这两天特意测试了一下，不过因
因为工作关系，有一个超过11亿记录的MySQL数据库，之前一直以为MyISAM引擎的查询性能会超过InnoDB，这两天特意测试了一下，不过因为数据量太大，转换引擎就花了几天时间。
测试环境：
DELL 860服务器，CPU Xeon3210, 内存8G
MySQL版本5.5.13，安装了两份实例，端口分别是3306（InnoDB)和3307(MyISAM)
MySQL客户端工具HeidiSQL 6.0.0.3603，查询语句：
select count(1) from mytable where update_datetime>'1900-01-01'
update_datetime字段都做了索引
查询时间分别如下（一共1,132,191,947条记录）：
InnoDB：763.672秒
MyISAM：4094.621秒
InnoDB比MyISAM快4倍多
以后有机会再测试一下MS SQL和Oracle的性能。
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