MySQL

MySQL database default database file location under Linux:The database file defaults to: Cd/usr/share/mysqlConfiguration file by default in:/ETC/MY.CNF———————————–Database directory:/var/lib/mysql/Configuration file:/usr/share/mysql (mysql.server

MySQL primary master (AA)Experimental environmentMaster-1 192.168.3.1Master-2 192.168.3.10Shut down the firewall (two units)[[Email protected] ~]# service iptables stop[Email protected] ~]# Setenforce 0Set Password[Email protected] ~]# mysqladmin-u

A lot of friends in the interview will encounter such problems, there are many projects in the operation for a period of time will also encounter the MySQL query slow some of the bottlenecks, today here is a simple introduction of my common several

1.c# can call the MSYQL import and Export command, but first you need to determine if the client has MySQL installed and the path to the MySQL installation.2. Querying the MySQL installation path functionprivate String Getmysqlpath (){String strpath

1. Stop MySQL Service2. Delete all relay logs in the MySQL log directory3. Delete all hostname-relay-bin.xxx under Mysqldata directory, Hostname-relay-bin.index and Relay-log.info3. Restart MySQL Service4. Restart the master and slaveMysql> Show

/usr/local/mysql/bin/mysqldump-uroot-pxxxxx--all-databases > All.sqlMySQL prompts "-warning:skipping the data of table mysql.event when exporting the database with mysqldump. Specify the--events option explicitly. "This is because mysqldump default

1. Integral type MySQL data type Meaning (Signed) tinyint (m) 1 byte range ( -128~127) smallint (m) 2 byte range ( -32768~32767) Mediumint (M) 3 byte range ( -8388608~83

Recent backup and attachment capabilities for MYSQ databases through C #Because MySQL has similar backup and additional CMD commands, but has not been used, today, under the practice, feel very efficient, more efficient than their own writing. Below

Reprint Source: http://chenzhou123520.iteye.com/blog/1849881Requirement: After you insert a record into the MySQL database using MyBatis, you need to return the self-increment primary key value for that record.Method: Specify the Keyproperty

MyISAM, InnoDB DifferenceNnodb and MyISAM are the two most common table types used by many people when using MySQL, both of which have pros and cons, depending on the application.The basic difference is that the MyISAM type does not support advanced

Dormant for a long time, has been busy several major projects. Several project content differ greatly from each other, but all of the payment and settlement parts have high precision requirements, one of which has a lot of real-time synchronization

A: a master thread (InnoDB almost all functions on this thread)B: A lock monitoring threadC: An error monitoring threadD: Four IO threads (insert buffer thread\log thread\write thread\read thread)The number of IO threads can be increased by the

Type: Reprint MySQL in the creation of user and authorization implementation method, for the first contact with MySQL friends can refer to the next Note: My operating environment is Widnows XP Professional + MySQL5.0One, create the user:Command:

1, command-line login commandMysql-h Localhost-u Root-p C:\users\lenovo>mysql-u root-p Enter Password: * * * * Welcome to the MySQL Monitor. Commands End With ;  or \g. Your MySQL Connection ID is 5 Server version:5.5.28 MySQL

The database was designed last week using the Java language and MySQL database, which involves knowledge of the Java connection database. First we need to add a jar file that is equivalent to a driver file for the connection, and here I add

The previous installation of MySQL under Windows did not have any problems, and the installation of Linux under the time of some problems, yesterday in the Windows installation was also a 1045 error, the personal experience to see this issue is the

http://blog.csdn.net/yangyu112654374/article/details/4251624such as an SQL statementSELECT * from TABLE1 where a1=1 and a2=2 and a3=3 order by A4 ASC;After optimization: Select A4,a1,a2 ... From TABLE1 where A1=1 and a2=2 and a3=3 order by A4 ASC;

MYSQLD is the MySQL server-side main process, it can be said that MYSQLD is the real core of MySQL, all work is around the mysqld process. So to dissect this behemoth of MySQL, Mysqld's code is the best breach.Everything starts with the familiar

Ken_len represents the number of bytes used by the index, based on this value, it is possible to determine the index usage, especially when combining indexes, to determine whether all the indexed fields are queried.Key_len shows the index length

MySQL database Optimization For a data-centric application, the quality of the database directly affects the performance of the program, so the database performance is crucial. In general, to ensure database efficiency, we should do the following