MySQL

Gtid is a global transaction ID that has been successfully executed based on the original MySQL server, combined with the server ID and transaction ID. This global transaction ID is unique not only on the original server, but also on all MySQL

Configuring the Environment Configuring the php.ini file to allow PHP to support mysqli extension librariesExtension=php_mysqli.dll Build a database and build a table See the blog "MySQL Extension library operation MySQL database"

The MySQL standard defines 4 isolation levels that define which changes within and outside a transaction are visible and which are not.Low isolation levels generally support higher concurrency and lower system overhead.Isolation levels from low to

The previous article, "MySQL pessimistic lock summary and practice" talked about the MySQL pessimistic lock, but pessimistic lock is not suitable for any scenario, it also has some shortcomings, because pessimistic lock in most cases rely on the

After querying the log is ' Fatal Error:can ' t open and Lock Privilege tables:table ' mysql.host ' doesn ' t exist ' this error (Less/var/log/mysqld.log)Try to remove all of the MySQL clean, generally delete dirty (after deletion of residual

Source: http://www.cnblogs.com/TsengYuen/archive/2011/12/06/2278574.html1 sudo rm/usr/local/mysql2 sudo rm-rf/usr/local/mysql*3 sudo rm-rf/library/startupitems/mysqlcom4 sudo rm-rf/library/preferencepanes/my*5 Vim/etc/hostconfig (and removed the

These two days make a data query difficult. The main focus is not on group by understanding. That's what happened.This demand, I think a lot of people have met. Here's what I'm simulating my table of contentsI need to remove the latest content from

1. First verify that the server is in a secure state, that is, no one can connect to the MySQL database arbitrarily.Because the MySQL database is completely password-protected during the reset of the root password of MySQLStatus, other users can

In daily operations, backup of MySQL database is crucial! The importance of the database to the website makes our management of MySQL data not be lost!Then, it is inevitable that people will make mistakes, maybe one day the brain short-circuited to

After building the MySQL database according to the method in the previous article, it is found that the other machines are still inaccessible.After modifying the permissions, refer to the following article to find that root in the local machine is

/******************************************************************** * ERROR 1130:host ' ... ′is not allowed to Connect to this MySQL server * Description: * Using remote login mysql, results can not log in, record the workaround. * 2016-9-22

Usually root, know MySQL root, root account passwordStart Item Right:Principle: Write a VBS script to the startup item with a high-privileged root, and then use methods such as DDoS, social worker, etc. to get the server to restart, run the script,

Common MySQL command Daquan One, the connection MySQL format: mysql-h host address-u user name-p user Password 1, example 1: Connect to the local MySQL. First open the DOS window, and then enter the directory Mysqlbin, and then type the command

Basic theory of mysql-relational databaseRelational model: (Structured data model)Relational modelEntity-Relationship ModelObject Relational Model: an object-based data modelSemi-structured data modelRelationships: Relational algebra

1) First check if MySQL is installed in the systemEnter sudo netstat-tap inside the terminal | grep MySQLIf not reflected, the installed results are not displayed and are not installed. If shown below, you have installed2) If it is not installed,

A subquery that uses the IN keywordQuestion: The query game type is the ' Chess class ' score information for the game-Game type information is not included in the Games score tableIdea one: Using link queryIdea two: In two steps, first find so '

　　First, the database connection general classImportant Interfaces:The interface is used to store MySQL connection data. This data can be used by classes that implement this interface.Through the interface can isolate a simple and necessary part of

when doing DB benchmarking, Qps,tps is a key metric for measuring database performance. This paper compares two kinds of calculation methods on the Internet. Let's take a look at the relevant concepts. Concept Introduction:qps:queries per Second

Mysql 5.7.14 installation and configuration code sharing, mysql5.7.14 This document records the installation and configuration code of mysql 5.7.14, as shown in the following figure. OS: CentOS 6.6DB: Mysql 5.7.14 1. Download mysql  Cd/tools Wget

MYSQL modifies the table name to a large-write stored procedure, mysql Stored Procedure This article will share with you the stored procedure of modifying the table name to uppercase in MYSQL. The specific content is as follows: 1. conditions:1.1