mysql query online

One: Connection query:Connection query is to connect two or more tables according to a certain condition, select the required data, the connection query query two or more tables at the same time, when there are fields representing the same meaning

Brief introductionMMM (Master-master Replication Manager for MySQL) is a set of scripting programs that support dual-master failover and dual-master daily management. MMM is developed using the Perl language, which is mainly used to monitor and

A slow query event caused by misjudgment of the online mysql optimizer. mysql misjudgment Preface: After receiving the crazy slow query and request timeout alarm, metrics analyzes the exception of the mysql request. cli-> show proceslist shows many

MySQL versions, for the Add index processing is different, there are three main types: (1) Copy table methodThis is the earliest supported way to create an index INNODB. As the name suggests, creating indexes is done through temporary table copies.

Original source: http://www.cnblogs.com/luckcs/articles/2543607.htmlMySQL Master-slave Replication (master-slave) and read-write separation (mysql-proxy) practicesAs the most widely used free database in the world, MySQL believes that all engineers

This article mainly introduces the use of basic commands in the MySQL Cluster configuration process. The example of two node connections is provided in the real-time recording. For more information, see the following. 1. check whether you should use

Http://heylinux.com/archives/1004.htmlAs the most widely used free database in the world, MySQL believes that all engineers engaged in system operations must have contacted. However, in the actual production environment, the single MySQL as a

[MySQLSlowlog] correctly and securely clear the online slow query log slowlog process [MySQLSlowlog] correct and secure clearing of the online slow query log slowlog process _ MySQL 1. see the slow log status; mysql> show variables like '%slow%';+-

The basic commands used for MySQL cluster configuration and the real-time operation process, 1. Check whether you should use a MySQL cluster. Reduce the pressure on the data center nodes and process large data volumes. MySQL is distributed and one

When publishing a query for a selected row, MySQL analyzes it to see if it can be optimized to make it faster. This article will study how the query optimization program works. For more information, see "GettingMaximumPerformancefromMySQL" in MySQL