MySQL

Environment: windows8+python2.7+mysql5.6 Having tried to embed the SQL language in C + +, and eventually failed in its complex "cumbersome" environment configuration, it was found that Python and MySQL were easier to implement and could import

What is Mycat? Simple to understand as a MySQL middleware, it supports shunt, heartbeat-based automatic failover, support read and write separation, support MySQL master-slave, based on NIO management thread of high concurrency ...See official

Common modeling tools are: PowerDesigner and Erwin, which are quickly eliminated, but the former is still active. I believe that we have met the project team has been operating for a long time, but even an ER diagram is not, today to explain the

This article mainly explains the MySQL group replication Introduction, the article related to the Mysql,group content, hoped to be helpful to everybody."MySQL Group Replication"The group replication is an open source plugin developed by MySQL and is

MySQL mainly uses two kinds of storage engines: MyISAM and Innodb. MyISAM is non-transactional and therefore has read faster, however InnoDB fully supports fine grained transaction locking (e.g. Commit/rollback). When you create a new MySQL table,

Customer's machine system abnormal shutdown, after restarting the MySQL database can not start normally, reinstall the system after the discovery of database file corruption, sad is that the customer database is not backed up in a timely manner,

First, IntroductionTurn on the slow query log, you can let the MySQL record query over a specified time of the statement, through the location analysis of performance bottlenecks, to better optimize the performance of the database system.Second,

IP address of Node1:192.168.1.254IP address of Node2:192.168.1.253The operating system is Rhel7.3,mysql version 5.7.181. Modify the node1 MySQL configuration file#注意server_id字段一定不能一样, because the previous configuration server_id is already

There may be scenarios such as some older systems that need to use MySQL version 5.5 to run and the rest.1. Login to download sitehttps://dev.mysql.com/downloads/mysql/The latest version at this time is 5.7.18.2, the old version of the download

"Install Nginx" #先安装如下包yum install gcc gcc-c++ kernel-Develyum-y install pcre-devel OpenSSL openssl-devel# Decompression Nginx-1.12.0The . tar.gz then enters the directory./configure--prefix=/usr/local/nginx--with-Http_stub_status_modulemake&&Make

The MySQL connection is first initialized via Init-connect and then connected to the instance.We take advantage of this by recording the user's thread_id, user name and user address in Init-connect to achieve DB access auditing.Implementation steps1.

1.? Database initialization Configuration 1.1.? Create a database create database apps character set utf8 collate utf8_bin;Create the database "app" and specify the encoding as UTF81.2.? Create user create user ‘apps‘@‘localhost‘ identified by ‘12345

Background:Because of the need to implement emoji expression comment function, so the database needs to support emoji expression storageMySQL UTF8 encodes a character up to 3 bytes, but a emoji expression is 4 bytes, so UTF8 does not support storing

Recently in Win8 and Win10 toss, install several times MySQL is unsuccessful. If you are having such a problem. Congratulations, here's the way . Summarize it now.1. Download MySQL 5.7 window64-bit Community compressed version: https://dev.mysql.com/

Recently encountered a headache in the project, the front sales team feedback a customer over the creation of the user (save object to DB) error, the front desk showed errors, but the database saved this record.After receiving this bug, the first

Original linkMySQL includes support for triggers. A trigger is a database object associated with a table operation that invokes the execution of a trigger on a table when a specified event occurs on the table on which the trigger is located.Create a

Emoji expression needs to use the encoding format is not utf8mb4,mysql database version to more than 5.5, I use 5.6, because only 5.5 or more support UTF8MB4.1. The database encoding is set to UTF8MB4, if you specify UTF8 when you build the library,

Slow Mysql storage write speed analysis, slow mysql write speedProblem background description: Execute SQL statements in MySQL, such as insert, which is slow and may be just a row of data insertion. The data volume is small, but it takes a lot of

Detailed description of four transaction isolation levels of MySQL and four levels of mysql Test environment of this experiment: Windows 10 + cmd + MySQL5.6.36 + InnoDB I. Basic Elements of transactions (ACID) 1. Atomicity: All operations after the

MySQL supports four transaction isolation levels and mysql supports four types of transactions. Test environment of this experiment: Windows 10 + MySQL5.6.36 + InnoDB I. Basic Elements of transactions (ACID) 　　1. Atomicity: All operations after the