MySQL

Mainly focus on two aspects of the problem1,JDBC Connection SectionJdbc.url= jdbc\:mysql\://xxxx\:3306/xxxx?useunicode=true&characterencoding=gbk&zerodatetimebehavior= ConverttonullHere Useunicode=true characterencoding only take

CentOS 6.2 Under install compile MySQL 5.6.231 single-instance MySQL database installation1.1 Creating a MySQL Account[[email protected] ~]# Groupadd MySQL[[email protected] ~]# useradd-s/sbin/nologin-g mysql-m MySQL #-m means no home directory

Win8 System MySQL 6.0 installation Diagram ( Wanghui 2015/04/08) 1, first double hit mysql-6.0.10-msi, and will appear as the interface shown . Click next; 650) this.width=650; "src="

BackupSet "ymd=%date:~,4%%date:~5,2%%date:~8,2%%time:~0,2%%time:~3,2%%time:~6,2%"MD "D:\databackup\%Ymd%""C:\Program files\mysql\mysql Server 5.5\bin\mysqldump.exe"--opt-q databasename-uroot-p123456 > D:\databackup\ Databasename%ymd%.sql@echo

from:http://blog.csdn.net/mydeman/article/details/6843398As a result of the rude interruption of an import process on September 30, today found that MySQL could not start, and had to unload load (may be able to take some time to find the problem,

I recently ran into a problem with MySQL reloading in a Windows environment, and today I have a record of my resolution process.First for some reason, I had to uninstall MySQL, and then reinstall, whether I use the Control Panel uninstall Remove

MySQL things day to the[Email protected] mysql]# LS-LDTR MYSQL-BIN.*-RW-RW----1MySQL MySQL2222211April9 ,: *Mysql-bin.000001-RW-RW----1MySQL MySQL245April9 ,: *Mysql-bin.000002-RW-RW----.1MySQL MySQL -April9 ,: *mysql-Bin.index[[email protected]

Optimal timingGeneral single table more than 5 million, or obviously feel the performance degradation, need to optimizeOptimization scenarios Read/write separation Use caching, such as memcached or Redis Use a search engine, such as

1. Execute the Install commandBrew Install MySQL2. After executing the input MySQL will have the following bugERROR 2002 (HY000): Can not connect to local MySQL server through socket '/tmp/mysql.sock ' (2)3.bug SolutionsUnset TMPDIR4.

in practical applications, we often have a requirement that a project's development team can only add and remove the database and data tables for the project they are working on, and not have permission to perform the above operations on the

1. From_unixtimeeffect: Displays the time in MySQL as an int (11) in the "YYYY-MM-DD" format. Example:Select Mtime, From_unixtime (mtime) from topics limit 10; 2. CONCAT (str1,str2,...) Function: Will str1, str2 ... Connect as a string. If any

This article optimizes MySQL database by 8 methods: Create INDEX, compound index, index does not contain NULL value column, use short index, sort index problem, like statement action, do not operate on column, do not use not in and <> operation1.

SQL operation summary and SQL Summary Multi-Table query of SQL statementsFor example, query employees and departments by department_id).Method 1(General): SELECT... FROM... WHERESELECT e. last_name, e. department_id, d. department_nameFROM employees

Analysis of several cases where the Mysql index will fail During the project process, it is inevitable that an index is created for mysql, but the query is still very slow, next we will analyze the causes and solutions for this situation:

Can 'tconnecttolocalmysqlserverthroughsocket SolutionFault description:Mysql startup error:ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql. sock' (2) 1. Check the mysql startup status first. #/Etc/rc. d/init.

View the maximum number of connections in MySQLMysql version: mysql5.5.40 or Mariadb 10.0.14 Max_connections = 151 by default Method 1: Applicable to linux [Root @ mydata184 ~] # Mysqladmin-uroot-p variables | grep max_connections Method 2:

Mysql encoding settings Mysql encoding settings MYSQL read 73 comments 1 font size: large, medium, small mysql> SHOW VARIABLES LIKE 'character_set_%';+--------------------------+----------------------------+| Variable_name | Value |+-----------------

Mysql simplifies INSERT and UPDATE through stored procedures Processing purpose: Execute UPDATE when the target record exists in the data table. When the target record does not exist in the data table, execute INSERT. This reduces the process of

Mysql: commandnotfoundThis problem is often encountered after mysql is compiled and installed.The root cause is that the mysql command is not loaded into the current user's environment variable.Solution # Find/-name mysql

MacOS10.10php cannot connect to mysql There is no problem connecting php to the database. After upgrading to 10.10, the connection suddenly fails. This problem has been put on for a long time. Today, I suddenly found an article. Solved by link. The