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mysql分表后如何分页 (总共160个表1500万数据)

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Jun 23, 2016 pm 01:40 PM

mysql分表后，有160个表，有1500万数据，要怎么做分页列表？
之前是想用union all合并160个表的结果集。。但直接卡的数据都出不来。。
请问这里应该怎么做分页，谢谢~~~

回复讨论(解决方案)

你这是自己做的分表，那么分表条件是什么呢？
如果分页的结果不能通过分表条件框定范围，那你的分表是失败的

不是说不能用 union，而是 union 的不是全部，而是经分表条件筛选后的部分表

徐版主好~我表里的数据主要字段是URL地址，有1600个域名，我是根据域名分成了160个表。

我的sql语句是这样的 (字段不多且都有用就用的*号)：

我的sql语句是这样的 (字段不多且都有用就用的*号)：
select * from t1 union all select * from t2 union all select * from t3.....union all select * from t160

既然你是按域名分表的，那么也就是按域名检索了
所以可以想象到，如果一个域名不在否一个表中的话，那么这个表是不需要参与检索的
这样一来你的检索范围不就缩小了很多了吗？

当一个表中包含有若干个不同域名时，你需要建一个目录表，指明某一类域名在某个表中
检索时先查目录表，得到可能在哪些表中，然后再在这些表中查找

如果你使用 mysql 提供的分表功能，那么就要简单多了

这个域名和表名的对应关系我有做，但是现在打开这个分页列表，应该是所有表所有域名的数据，再分页，不是某部分域名或某部分表。

你这个有特殊排序条件吗？没有的话直接逐表读取所需数据就行了。

没排序，只要把所有数据列出来就好了，是160个表1500万数据都得弄出来做分页。。。逐表读取的话不行吧？！

要是整体的分页显示那就更简单了
1、每个表的记录数是已知的，应在每次发生变化时记录到目录表中
2、无论是否排序（如果排序只是表的次序不同）至多会 union 两个分表

如假定共3个分表，记录数分别为 90，120，80 总记录数为 290
设分页是每页显示40条，则
第1页表一的 1 到 40
第2页表一的 41 到 80
第3页表一的 81 到 90 + 表二的 1 到 30
第4页表二的 31 到 70
第5页表二的 71 到 110
第6页表二的 111 到 120 + 表三的 1 到 30
.....
计算起来非常简单

谢谢徐版主耐心回答。

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