Category: MySQL

Below is an example of creating user user123 with database user123 and password a123456.

1. Modify the mysqld configuration file my.cnf to adjust the value of max_allowed_packet. Setting it to 5M is usually appropriate. [mysqld]port = 3308socket = /dev/shm/mysqld.sockskip-external-lockingkey_buffer_size = 16Mmax_allowed_ …

Query the logs to locate the recovery starting point and export the SQL: Here we use the 10_163_0_72-bin.000009 binlog as an example:

mysqlbinlog –no-defaults –start-datetime="2019-01-11 18:38:56" –database=superstar /home/10_163_0_72-bi …

MySQL timeout error as follows:

The last packet successfully received from the server was

Use the following command to query the timeout duration (in seconds, default is 8 hours):

show global variables like 'wait_timeout';

In my.ini, mys …

MySQL 5.7 Key Features: Better Performance
With better optimization for multi-core CPUs, solid-state drives, and locking, 1 million QPS is no longer MySQL’s goal—whether the next version can reach 2 million QPS is what users care more about. Better InnoDB Storage Engine and More Robust Replication
Replication brings data integri …

MySQL Create User Error:
#1805 – Column count of mysql.user is wrong. Expected 43, found 42. The table is probably corrupted

Cause:
The database structure was not upgraded with mysql_upgrade after upgrading MySQL.

Solution:
fin …

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Sometimes a table contains many empty rows that you may want to delete, or you need to delete all rows where a certain field equals a specific value. You can use the following command.

Command:
delete from tabl where `codes` = ''; # Delete rows in the tabl table where the codes field is empty …

Introduction:

MHA (Master High Availability) is a relatively mature solution for MySQL high availability, developed by youshimaton from DeNA Japan (now at Facebook). It is an excellent high-availability software for failover and master-slave promotion in MySQL high-availability environments. …

— Warning: Skipping the data of table mysql.event. Specify the –events option explicitly.

mysqldump -uroot -pxxxxx –all-databases > all.sql
When exporting databases with mysqldump, MySQL shows “– Warnin …