MySQL

In the project, there are often the following scenarios:After you bulk insert a batch of data into the database, you need to know which inserts were successful and which failed.At this time there will always be two ideas, one is to determine the

1. Install Agent client FirstTar zxvf zabbix-3.2.6. TAR.GZCD Zabbix-3.2.6. /configure--prefix=/data/zabbix--enable-java --enable-agent--with-net-snmp--with-libcurl--with-openiomi--

First, the database operationCREATE Database db1 charset UTF8; View the database show Database;show the CREATE database db1; Select Database (); Delete database db1; ALTER DATABASE DB1 DB2 charset UTF8;Ii. creation of tables and insertion of

Turn on MySQL remote access permissionThe default MySQL user does not have remote access permission, so when the program is not on the same server as the database, we need to turn on MySQL remote access.There are two main ways to change the table

MySQL physical Backup tool xtrabackup installation configuration 1????XtrabackupTools IntroductionXtrabackup is a InnoDB to do physical data backup tools, Support Online hot backup (backup without affecting the data read and write), is a commercial

MySQL installation version: 5.7.20Installation Tutorials: On the https://dev.mysql.com/downloads/mysql/page, select the Zip package download (archive for archival meaning) After downloading, unzip and configure the

MySQL Architecture:By: Connection pooling components, management services and tools components, SQL interface components, Query Analyzer components, optimizer components,Buffer components, plug-in storage engine, physical file composition.MySQL is a

Enter the connected host to modify the system database MySQL the user table below, change the user= root (here may be the user name that you need to connect) the host of this line of data from localhost to%Such as:Be sure to restart the MySQL

1 What are databases (database, abbreviation DB)The database is the warehouse where the data is stored, except that the warehouse is on a computer storage device, and the data is stored in a certain format.In the past, people stored data in cabinets,

1. Preparation of two tablesTable ATable B2. Test the connection query:(1) Cross connection (Cartesian product)SELECT * from a a B　　(2) Inner connectionShow internal connectionsSELECT a.*,b.* from a INNER JOIN B on A.age=b.agebdisplay the INNER join

A brief introduction: Today let's talk about the preliminary understanding of sharding rulesSecond Frontier: Mycat's Shard rules are very rich and can also be extended according to JavaThree documents: Rule.xmlFour specific Shard rules:Five what we

#1Add (a total of three ways) # Inserts a single record insert into T1 (name,...) VALUES ('LZP',..); Note: T1 (name,...) Must contain all non-empty columns (except for the self-increment column) # Insert multiple record insert into T1 (name,age)

Simple additions and deletions via JDBC (take MySQL for example)DirectoryPreface: What is JDBCI. Preparatory work (i): MySQL installation configuration and basic LearningIi. preparatory Work (ii): Download the jar package for the database and import

First, IntroductionWhat is lampLamp is a Web network application and development environment, is the abbreviation of Linux, Apache, MySQL, Php/perl, each letter represents a component, each component in itself is a very powerful component in the

In MySQL, if you want to see the definition of a table, you have the following options1. Show CREATE TABLE statement:Show CREATE TABLE table_name;2. DESC TABLE_NAME Statement:CREATE TABLE person ( ID int. NOT NULL auto_increment primary key,

Preparation (two sheet t1,t2):Table T1:Mysql> select * from T1;+-------+---------+| t1_id | T1_name |+-------+---------+| 1 | T1_1 || 2 | t1_2 |+-------+---------+2 rows in Set (0.02 sec)Table T2:Mysql> select * from T2;+-------+---------+| t2_id |

MySQL seems to be starting from 5.0.2 version to support the function of the trigger, this blog to introduce the trigger, first of all, or talk about the concept of something:What is a triggerA trigger is a database object that is related to a table,

Often site administrators for various reasons and operations, resulting in site data mistakenly deleted, but also did not do site backup, the results are overwhelmed, and even to the site operation and profit negatively. So this article we will

Using MySQL in Windows: automatic and scheduled backup, windowsmysql I. Write backup scripts rem auther:www.yumi-info.comrem date:20171222rem ******MySQL backup start********@echo offforfiles /p "E:\mysql\MySQL BackUp" /m backup_*.sql -d -30 /c "cmd

Download, install, configure, and use MySQL in Windows MySQL Overview MySQL is a relational database management system, and a database is a structured data set. It was initially developed by MySQL AB in Sweden and now belongs to Oracle. MySQL is an