问题描述
谁能告诉我在查找表的行数时，他在 MySQL 中使用哪种方法更好:这样做更好吗
Can anyone tell me which is he better appraoch in MySQL whin it comes to finding the row count of a table: is it better to do
SELECT COUNT(*) FROM TABLE_NAME
还是在INFORMATION_SCHEMA的TABLE表中查找行数?
or to look up the row count in the table TABLE in the INFORMATION_SCHEMA?
这会是计算页面分页计数的常用操作吗?
This would be a frequent operation for calculating pagination counts for pages?
我应该补充一点，表格最多只有几千行.
I should add that tables will only have a few thousand rows at most.
谢谢
马丁·奥谢.
推荐答案
在MyISAM中，这个查询:
SELECT COUNT(*)
FROM TABLE_NAME
是即时的，因为它保存在表元数据中，所以几乎可以自由地发出这个查询，并且它总是会得到正确的结果.
is instant, since it's kept in the table metadata, so it's almost free to issue this query and it will always get the correct result.
在 InnoDB 中，此查询将一一计算行数，这可能需要一些时间.
In InnoDB, this query will count rows one-by-one which could take some time.
所以如果你不需要COUNT(*)的精确值，你可以查询INFORMATION_SCHEMA.
So if you don't need exact value of COUNT(*), you may query INFORMATION_SCHEMA.
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