[size=large]当mysql 数据量超过百万时，在字段上创建索引是很有必要的。[/size]
[img]http://dl.iteye.com/upload/attachment/601987/565510d9-972b-3f1e-b6c4-fd9623e1429c.png[/img]
[img]http://dl.iteye.com/upload/attachment/601998/e5986d15-f101-3cbf-8170-ff3fd0ca2046.png[/img]
[img]http://dl.iteye.com/upload/attachment/602000/f563c7c4-c263-37c9-bc06-4adf6edf3b1c.png[/img]
[img]http://dl.iteye.com/upload/attachment/601987/565510d9-972b-3f1e-b6c4-fd9623e1429c.png[/img]
[img]http://dl.iteye.com/upload/attachment/601998/e5986d15-f101-3cbf-8170-ff3fd0ca2046.png[/img]
[img]http://dl.iteye.com/upload/attachment/602000/f563c7c4-c263-37c9-bc06-4adf6edf3b1c.png[/img]
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