Community Learn Tools Library Leisure
search
English
Home > Database > Mysql Tutorial > mysql千万级的count统计对比_MySQL

mysql千万级的count统计对比_MySQL

WBOY
Release： 2016-06-01 13:31:04
Original
2597 people have browsed it

bitsCN.com

mysql千万级的count统计对比

 

数据库：mysql 5.5 

数据量：45199077 条

 

sql语句：

[sql] select count(1) from tbresult;  select count(id) from tbresult;
Copy after login

 

查询时间对比图：

 

mysql千万级的count统计对比_MySQL
mysql千万级的count统计对比_MySQL

 

总结：在统计查询的时候尽量使用count(id)，不要使用count(*)这样的；特别是数据量特别大的时候。

 

下面是重启后的对比图

 

mysql千万级的count统计对比_MySQL

 

重启mysql并把sql语句换位置后的结果：

 

mysql千万级的count统计对比_MySQL

bitsCN.com
Related labels：
count mysql sql statement database
source：php.cn
Previous article：mysql小技巧-不写函数实现split截取_MySQL Next article：Mysql门徒(2)：Mysql 查看、创建、更改 数据库和表_MySQL
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
Dynamically modify inline CSS styles in Javafx I'm trying to change the background image of a pane when the application is maximized. My ...
From 2024-04-06 20:57:16
0
1
487
How to insert multiple rows in MySQL table and return new IDs? Normally I can insert a row in a MySQL table and get the last_insert_id. But now, I want t...
From 2024-04-06 10:03:44
0
2
294
Is it possible to combine subqueries and joins in a single MYSQL statement? This question confuses me. I'm trying to use Join and subqueries in mysql but I keep getti...
From 2024-04-04 13:00:10
0
1
335
How to conditionally get price*quantity using CASE If I have sale_price, I will use sale_price*quantity to express the total price. If you do...
From 2024-04-03 20:45:07
0
1
390
Looking for an efficient way to handle a large number of repeated If statement checks When I'm trying to create a search tool for a database I created for my undergraduate thes...
From 2024-04-03 19:20:08
0
1
297
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template