如何提高数据库update更新的速度_MySQL
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如何提高数据库update更新的速度
不用不知道，一用吓一跳。。看下面这条SQL语句
[java] String sql="update cats set name_alias='"+rs.getString(1)+"'where name='"+rs.getString(1)+"'";
如果数据量很小的话，肯定不会存在什么问题，一眨眼就更新好了。但如果是大一点的表，不用说几百万条，几万条记录就已经要耗费小时级别的时间了。
解决方法就是where条件里面的字段一定要加索引，一般直接利用表的主索引就可以了，例如下面这条SQL语句，id就是主索引。
[java] String sql="update cats set name_alias='00000'where id='"+rs.getInt(1)+"'";
这样优化之后，更新的速度就大幅增加，几分钟就可以搞定万级别的更新操作。
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