MySQL

I've seen a lot of explanations for max_conections & max_user_conenctions variables on the internet before, but it's a little bit inaccurate, or it's very vague, so read the official MySQL documentation 6.3.4 Setting Account Resource Limits chapters

The software mentioned below can be downloaded in the following link.You can use the following action to record the video to complete the relevant operation.Use PowerDesigner and pdmreader to reverse generate MySQL data dictionary. Wmv_ free high

MySQL backup and restore is done using the mysqldump, MySQL, and source commands.Backup and restore of MySQL under 1.Linux1.1 Backup[[email protected] ~]# cd/var/lib/mysql (go to MySQL library directory, adjust the directory according to your MySQL

At first, in the Internet to find a lot of template reference documents, are not suitable for their own environment, their own groping to find out, finally made.Thank you very much for the 51 technology "YANGZHIMINGG" provided by the monitoring

Transferred from: http://www.jb51.net/LINUXjishu/36171.htmlFirst, summarize:1.linux commands to start MySQL:Mysqladmin start/ect/init.d/mysql start (front of MySQL installation path)2.linux Restart MySQL command:Mysqladmin restart/ect/init.d/mysql

1, new database Centos_old. MySQL > CREATE database centos_old; 2. Use select Concat to spell all rename table statements. Mysql-uroot-p-E "select concat (' Rename table CentOS. ', table_name, ' to Centos_old. ', table_name, ';

Learning content:Basic operations for staging tables and views ...Scope of use of temporary tables and views ...1. Temporary tablesTemporary tables: temporary tables, presumably everyone knows the existence of this concept ... But when should we use

There are two ways to delete data in MySQL, one is a DELETE statement and the other is a TRUNCATE TABLE statement. The DELETE statement can select the record to be deleted by where. Using TRUNCATE TABLE will delete all records in the table.

preparatory work , well jdk,myeclipse.Download the JDBC Driver Mysql-connector-java-5.0.5-bin.jar import into the project1. Engineering (right-click)--buildpath--configure build Path--add external jars.2, can also be added to the Classpath, as

1. Download the official Zip package to extract to the local directory2. Modify the My.ini file copy Default.ini and modify[client]port=3306default-character-set=utf8# client character type, consistent with server, recommended

Groupadd MySQLUseradd-r-G MySQL MySQLMV mysql-5.5.27-linux2.6-i686//usr/local/Ln-s Mysql-5.5.27-linux2.6-i686/mysqlCd/usr/local/mysqlChown-r MySQL.Chgrp-r

Two solutions for implementing MySQL nested transactions in PHP first, the origin of the problemThere is a clear explanation in the official MySQL documentation that nested transactions are not supported:[SQL]View Plaincopy

The SQL used to manipulate the database is generally divided into two kinds, one is the query statement, which is what we call the SELECT statement, and the other is the UPDATE statement, also called the data operation statement. The implication is

 MySQL timed task event, storage process (periodically delete data from the specified table 90 days before the specified time)Category: mysql5.x2014-06-23 15:16 1266 People read comments (0) favorite reports MySQL Database[SQL]View Plaincopy

Tuning-primer.sh detects the current operation of MySQL, generates reports, and gives recommendations for optimization. Download and use:1.wget http://www.day32.com/MySQL/tuning-primer.sh2. Copy the tuning-primer.sh to the my.cnf Sibling directory3.

MySQL insert when record does not exist (insert if not exists)In MySQL, inserting (insert) A record is simple, but some special applications, before inserting a record, need to check whether the record already exists, only if the record does not

MySQL startup times wrong: starting MySQL ... error! The server quit without updating PID file (/opt/mysql/data/mysql.pid) Workaround:First look at the configuration of my MySQL configuration file:Cat/usr/local/mysql/my.cnf[Mysqld]Basedir

MySQL backup-mysql dump Back up MySQL directly by using the mysqldump command to back up it to the SQL format. The simplest command is:   mysqldump databasename > bak.sql The generated bak. SQL content format is as follows:     -- MySQL dump 10.13

How to optimize the MYSQL database and optimize the mysql database 1. select the most suitable field attribute Minimize the length of the defined field and set the field not null, for example, 'province, gender'. It is best to set it to ENUM. 2. Use

Share the encapsulated asynchronous Mysql dynamic library (DyNetMysql. dll) + project source code, and mysql asynchronous Mysql databases are often used for C ++ projects. The data provided by Mysql interfaces is quite primitive, such as field names,