mysql show long running queries

1. Reasons for a long-time executed queryLong-time queries due to poor SQL execution efficiency:Long queries caused by SQL injection:Because DDL statements cause table metadata lock waits:2. Problems caused by long-time queriesIn general, queries

1. View MySQL server configuration informationMysql> Show variables;2. View the various status values running on the MySQL serverMysql> show global status;3, slow query1. mysql> show variables like ‘%slow%‘; 2. +------------------+-------+ 3. |

mysql> show global status; Can list MySQL server running various status values, my personal preferred usage is show status like ' query value% '; One, slow query mysql> show variables like '%slow% '; +------------------+-------+ | variable_name

About MySQL TuningThere are 3 ways to speed up the running of the MySQL server, from low to high efficiency:Replace the problematic hardware.Tuning the MySQL process settings.Optimize the query. Replacing the problematic hardware is usually our

MySQL performance tuning and Architecture Design-Chapter 1 Performance Design-MySQL Replication and replication Optimization Chapter 1 scalability design-MySQL Replication Preface: MySQL Replication is a unique feature of MySQL. It can completely

Slow sql: Queries that run longer than a given time range are called slow queries.How do I record slow sql in MySQL?A: You can set the following information in MY.CNF: [Mysqld] ; Enable the slow query log, default

MySQL has a lot of basic commands, and the show command is also one of them. In many users, the use of the show command is also prone to confusion. This article summarizes the many usage of the show command.1. Show tables or show tables from

Excerpt from: http://www.jb51.net/article/33736.htmWith the help of explain, you know when to add an index to the table to use the index to find records and make the select run faster.If some problems arise due to improper use of the index, you can

Welcome to the Linux community forum, and interact with 2 million technical staff to enter the running mysql status to view the running mysql monitoring, one of which is to view the mysql running status. (1) QPS (queries per second) QPSQuestions

Role of the master and slave: 1. It can be used as a backup method. 2. read/write splitting to relieve the pressure on a database MySQL master-slave backup principle: Mysql master-slave replication requires at least two Mysql services. Of course,