show processlist

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Use of runtime tools in Percona Toolkit series

Percona-toolkit tutorial tools 1. pt-archiver Function introduction: Archive the records of tables in the mysql database to another table or file Usage: Pt-archiver [OPTION...] -- source DSN -- where WHERE This tool only archives old data and does

Understanding MySQL-Replication)

1. Overview of Replication 1.1 problems solved by ReplicationData replication technology has the following features:(1) Data Distribution(2) load balancing)(3) backup(4) high availability and fault tolerance 1.2 How replication worksFrom a

Mysql Database Deadlock Process Analysis (select for update) _mysql

Recently there is a business needs, multiple machines need to query data from a MySQL table at the same time and do follow-up business logic, in order to prevent more than one machine to get the same data, each machine needs to be in the acquisition

Using Innodb_monitor to monitor blocking samples

Simulate a scene: To build a InnoDB engine table: CREATE TABLE Shuzhi ( ID Mediumint (8) Primary key, Name varchar (30), Shuzhi Mediumint (10) ); ALTER TABLE Shuzhi ENGINE=INNODB; Insert Some records: INSERT into Shuzhi values (1, ' AA ',

MySQL state view method How does MySQL view the number and status of connections? _mysql

How do I get into the MySQL command line? MySQL's installation directory has a bin directory, first use the command line to enter the directory, and then log in with mysql-uroot-p123456 (Note: username and password do not include "") Command: Show

MySQL manual version 5.0.20-mysql sync (v)

Mysql 6.9 Sync FAQ Q: Master is still running, how can I configure slave without stopping it? A: You need to design several option parameters. If you have a backup of MASTER and record the data snapshot binary log file name and the offset location

Mysql DBA Advanced OPS Learning Note-one master multiple from the library to switch between master continuation and sync from library process

1. Master Vault Master OutageSign in from library show Processlist\gSee update status for two threadsmysql> show processlist\G*************************** 1. row *************************** Id: 1 User: system user Host: db: NULLCommand: Connect

Mysql Lock Summary

LockMyISAM only supports table lockscreatetable crm_member; ##查看引擎altertable crm_member engine = MyISAM; ##更改表引擎Read Lock DemoSession 1 Read lock Other session can be read and not writablelock table crm_member read;Session 1 Lock Wait time

13.1 Settings Change root password 13.2 Connect MySQL 13.3 mysql common command

13.1 Setting Change root password[Email protected] init.d]# echo $PATH/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin[Email protected] init.d]# path= $PATH:/usr/local/mysql/bin[Email protected] init.d]# Vim/etc/profile[Email protected]

Replication latency due to MySQL 5.7 concurrent replication and mysqldump mutual blocking

Originally the MySQL binlog and show processlist commands belonged to the two transactions of unrelated, but in the most recent troubleshooting, there was a significant replication delay found in the main library and from the library, but the

"MySQL" "High Availability" simple analysis of MHA switching logic from the Masterha_master_switch tool

Summary: Masterha_master_switch is integrated as a switch tool in the MHA package,Install: After compiling and installing MHA Manager, binary executable program Masterha_master_switch will be generated in/usr/local/bin/.Use:$masterha_master_switch --

How MySQL optimizes when it consumes too much CPU

Tag:nec   root   rac   cond    Run      function    gone   process    unit     When MySQL consumes too much CPU, what should I do to optimize it?High CPU consumption, can be considered as follows:1) Generally, to eliminate the high concurrency

Mysql view number of connections, status

http://blog.csdn.net/starnight_cbj/article/details/4492555command: show Processlist;if it is the root account, you can see the current connection for all users. If you are a normal account, you can only see the connection you are occupying. show

Too many connections problem solving in MySQL

Today, my MySQL met a mistake that wasn't so strange "Too Many connections" . Normally encountered this problem, I basically modify /etc/my.cnf 'smax_connections parameter, and then restart the database. ButThe database on the production server is

MySQL master-slave delay replication practice and production failure case recovery practice

1.1MySQL master-Slave delay Replication IntroductionFrom MySQL5.6 to support the master-slave delay replication, the main problem is that when the main library has a logical data deletion or error updates, all the library will be the wrong update,

Summary of MySQL events (event)

1 Event BriefThe event is a procedural database object that MySQL invokes at the appropriate time. An event can be invoked once or periodically, and it is managed by a particular thread, the so-called "event Scheduler".Events are similar to triggers,

MySQL view maximum number of connections and modify maximum connections

1. View the maximum number of connectionsShow variables like '%max_connections% ';2. Modify the maximum number of connectionsSet GLOBAL max_connections = 200;The following article is mainly to introduce you to the MySQL maximum connection number of

How MySQL optimizes when it consumes too much CPU

When MySQL consumes too much CPU, what should I do to optimize it?High CPU consumption, can be considered as follows:1) Generally, to eliminate the high concurrency factor, or to find out what causes your CPU is too high in the execution of the

MySQL master-slave-master-slave normal switch, main library outage switch.

MySQL master-slave Switch manualMaster-slave ArchitectureOperation and Maintenance DepartmentV1.0 . Year May 24Normal switching Check slave synchronization Status 1) in master execution: show Processlist;Show Master have sent all

Monitor slave latency status under MySQL master-slave replication

In a MySQL replication environment, we usually only judge the latency of the slave based on the value of the seconds_behind_master . This is acceptable in most cases, but is not accurate enough and should be considered for more factors.First, let's

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