MySQL

There are 2 types of commands that can be executed within the MySQL client:1. Client commands:Do not need to add a statement terminator, the display is only mysql this client command changed how to use, no operation involving the server, directly

DBMS for database management systemsDbms,database Management System Database management, simply said: is a large software to manage data. The DBMS primarily manages, maintains, and processes data, or handles the security and integrity of the

After reading a few documents, have not written completely. A little tidying up, re-step to compile and install MySQL on the centos7.The installation steps are as follows:1. Install the compilation environment # yum-y Install gcc-gcc-

MySQL Big data paging and indexing using the overwrite index A table establishes an index on the id,create_time. The following 2 SQL statements are executed in the same time. Because the query field ID is overwritten by the index.

Version selectionBecause MySQL version more and more, and as small and medium-sized website may not have enough economy to buy commercial version, so generally choose free version, and the function is enough to use.Rich willful download Enterprise

Everyone in the remote connection to MySQL should have encountered, the root user of MySQL, can only be locally connected, foreign refused to connect.We need to create a database account that allows remote logins so that you can easily operate the

Problem Description:Today, a project database is ported to the Liunix server, resulting in the inability to find table errors, querying the database, the table does exist. After analysis and comparison, it is found that the case of table name is

2, String function (1) function to calculate the number of characters in a string and the length of a stringChar_length (str) returns The number of characters that the string str contains. A multibyte character is counted as a single

MYSQLDUMP-H host name-P Port-u user name-p password (–database) database name > file name. sqlCommands to back up the MySQL databaseMysqldump-hhostname-uusername-ppassword databasename > Backupfile.sqlbacking up the MySQL database is a format with a

Check to see if the system has the MySQL-to-use command:Rpm-qa | grep MySQLTo uninstall an installed mysql--> use command:#rpm-E--nodeps mysql-libs-*Delete all files under the/var/lib/mysql folderMySQL Installation:Execute command: Install

When you first install and run MySQL, you may encounter some errors that make the MySQL server unable to start. The purpose of this document is to help diagnose and correct these errors.First, when installing MySQL, please shut down the firewall and

A data type is a basic rule that defines what data can be stored in a column and how that data is actually stored. MySQL's common data types include: string Data type : The most commonly used data type, there are two basic types of strings:

1. First check that the system has no MySQL installed[Email protected] opt]# rpm-qa| grep MySQL# We see that there is no mysqlinstalled,but there is a mysql Libs Development Package plugin, what does he do? # Explanation: Because the CentOS6.4

MySQL version:5.5.36[email protected] 5.5.36-log XXX 10:19:54>show index from fd_finance_acc_his;+--------------------+------------+------------------------+--------------+--------------+-----------+--------- ----+----------+--------+------+---------

An error occurred while modifying the table structure: Specified key was too long;max key length is bytes.MySQL version for server version:5.1.36, Execute SQL for: ALTER TABLE pre_common_diy_data Modify column Targettplname varchar (255);If a

MySQL has the following types of logs:error log: -log-err query log: -log Slow query log: -log-slow-queries Update log: -log-update Binary log:-log-bin by default, all logs are created in the MYSQLD data directory. By refreshing the log, you can

When configuring MySQL master and slave, because it is a copy of the MySQL directory, resulting in the same master-slave MySQL uuid, slave_io can not start, error message as follows:The slave I/O thread stops because master and slave have equal

This article lists five MySQL query optimization methods, of course, there are many methods of optimization.1. Optimize data typeThere are several types of data in MySQL, and if you are a DBA, you are rigorously checking the data types according to

SQLite3 database on a file, copied at any time to take away, debugging convenient, super lightweight, has its benefits.However, MySQL is the mainstream of small and medium-sized projects, recently wanted to deploy the Django Milestone project to the

About MariaDB installation problem note (CMake Error at), mariadbcmake The following error is always prompted when installing MariaDB today, but I have installed the libaio-devel Library: CMake Error at