Mysql slow query log content viewing problem

The slow query log is enabled in mysql, but I often see such a query in the log. I don’t know what it means. I...

From [MySQLdiscussion group] 2017-06-28 09:23:21 0  2  975

slow-start - [ERROR] Failed to write to mysql.slow_log

{代码...} I have a mysql server5.6. mysql> set global log_output = 'TABLE'; Always output error informati...

From [MySQLdiscussion group] 2017-06-28 09:23:18 0  1  1029

How to use UNIQUE of PHP and MySQL to ensure that the user name is unique like JD.com registration?

I think that such quick judgment of duplicate user names is achieved by setting the user name field UNIQUE and...

From [MySQLdiscussion group] 2017-06-28 09:23:08 0  3  858

Asking for advice on a mysql table grouping index problem

I'm working on a website program, and the general requirements are as follows. Users are divided into five lev...

From [MySQLdiscussion group] 2017-06-28 09:22:55 0  5  845

What is the error in the MySQL create table structure statement?

(www.sf.gg) is China's leading developer technology community. We hope to provide a pure, high-quality technic...

From [MySQLdiscussion group] 2017-06-26 10:49:29 0  3  975

Question about not being able to modify field names in MySQL

(www.sf.gg) is China's leading developer technology community. We hope to provide a pure, high-quality technic...

From [MySQLdiscussion group] 2017-06-26 10:49:27 0  1  1001

Question about updating data in MySQL [update] cannot be successful

(www.sf.gg) is China's leading developer technology community. We hope to provide a pure, high-quality technic...

From [MySQLdiscussion group] 2017-06-26 10:49:26 0  3  802

How to batch update mysql according to respective conditions

There are two existing tables. A is the detailed table id uid cost 0 1 4 3 Now we need to group the data with ...

From [MySQLdiscussion group] 2017-06-26 10:49:25 0  1  980

mysql scripts presented /usr/bin/perl: bad interpreter

-bash: scripts/mysql_install_db: /usr/bin/perl: bad interpreter: No such file or directory但我已经yum -y install p...

From [MySQLdiscussion group] 2017-06-26 10:49:24 0  2  1172

Mycat configures sub-tables, the underlying mysql, an array overflow exception occurs in the query, what is the reason?

Start mycat normally and configure sub-tables. This exception occasionally occurs when querying. Have you enco...

From [MySQLdiscussion group] 2017-06-24 09:42:15 0  1  967

mysql - How to record table structure changes in the database?

During the development process, the table structure will always need to be changed. Can each change to the tab...

From [MySQLdiscussion group] 2017-06-24 09:41:40 0  1  1169

php - How to split large batches of data?

Hello everyone, there are 10,000 orders in the database, and various calculations need to be performed on the ...

From [MySQLdiscussion group] 2017-06-24 09:41:39 0  2  982

postgresql - What are the advantages and disadvantages of on duplicatekey update in MYSQL?

on duplicatekey update If it exists, it will be updated, if it does not exist, it will be inserted. It is an o...

From [MySQLdiscussion group] 2017-06-24 09:41:38 0  1  1384

mysql - efficiency issues of inner join and left join

Under what circumstances will the execution efficiency of inner join and left join be relatively high?

From [MySQLdiscussion group] 2017-06-24 09:41:36 0  2  1824

php - yii2-ueditor-widget

yii2-ueditor-widget When using a text editor, the ActiveForm form validation error in Yii will not prompt an e...

From [MySQLdiscussion group] 2017-06-24 09:41:35 0  1  820