因此,我有一个略超过500万的桌子。 当我使用时 que。 当我去除问询时,我是在第二次与LMIT25见面时。 我的问题是,出于想象原因,除了增加总行数之外,还有其他选择?
SQL 迫使MySQL冲锋枪,即使他们从来都无法驾车。 从内部来看,这相当于在没有《利比里亚义务公约》条款的情况下执行的同一问题。
如果通过WHERE进行过滤的频率太高,你可以计算和收集各种过滤器,以节省cal-深层_子施加的全扫描负荷。 基本操作“当选数(*) 尽可能在......范围内适用......条款。
否则,你就能够进入谷歌式,只是抽出一些页数,有时与现实没有任何关系。 (你们知道,见“Goooooooooooogle”,第3页,突然脱离结果。)
关于实施谷歌式,利用MySQL进行想象
页: 1 和_CALC_FOUND_ROWS,视具体情况而定。 如果您的查询标准使用指数中的数据――使用COUNT(*)。 在这种情形下,Mysql将“阅读”从指数中“阅读”,但不必触及表格中的实际数据,而LucalC_FOUND_ROWS方法将用磁盘中装上可能昂贵和耗费大量时间的电流。
http://www.mysql Performanceblog.com/2007/08/28/to-sql_calc_found_rows-or-not-to-sql_calc_found_rows/“rel=”nofollow”>。
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