MySQL single database and table splitting using MYCAT

One 、Mycat Installation and deployment

Get ready ：

Installation environment Linux

mycat Runtime needs java development environment , So you need to install JDK

Before installation, check if the system comes with your own open-jdk

command ：

rpm -qa |grep java
rpm -qa |grep jdk
rpm -qa |grep gcj

If no information is entered, it means no installation .

If installed, you can use

rpm -qa | grep java | xargs rpm -e --nodeps 

Bulk unload all with Java The file of     The key word of this command is

java

First retrieve contains java A list of

yum list java*  retrieval 1.8 A list of

yum list java-1.8*

    install 1.8.0 All files for

yum install java-1.8.0-openjdk* -y

Use the command to check if the installation is successful

java -version

install mycat

mycat It's from 1.6.5 The version supports single database and table splitting . You can choose the appropriate version according to your own needs

download Mycat 1.6.5 wget http://dl.mycat.io/1.6.5/Mycat-server-1.6.5-release-20171029183033-linux.tar.gz 

After decompressing , Modify the configuration file , stay mycat/conf Next

Mycat Is a database middleware , It does not have the function of data storage , It can be simply understood as an intermediary agent , It is equivalent to an intermediary or errand boy . Help you integrate data processing , So in order to realize data storage , Support for deploying physical databases is required , Need to install MySQL( This is when you have installed MySQL, I won't repeat MySQL Installation ).

1. modify server.xml

Set up user name,password And schemas,  name and password To be in Mycat Connect MySQL Database ,schemas It's the logic library , Want to be with schema.xml Inside schema name Corresponding .

2. modify schema.xml

Pictured ,schema name Want to be with server.xml Corresponding upper ,user The table is divided into ten tables , You can only set one datanote,rule Adopt mold taking mode mod-long.writeHost and readHost Set to the same database .

3. modify rule.xml

The default is selected this time mod-long The rules , Only need to modify count Count , Corresponding upper subTables Just count .

modify property count  be equal to 10.

such , Configuration is complete .

Two 、 start-up Mycat And connections MySQL

First in MySQL On the library , build 10 A watch ,user1-user10.

1. Get into Mycat Under bag bin Catalog , start-up Mycat   

./mycat start

2. Connect MySQL  

mysql -utest -ptest -h127.0.0.1 -P8066 -Dzhenxui

3. Inquire about Mycat user

4. Query sub table

10 Zhang Zibiao found out all of them

5. To the library insert data

Previously inserted 40 Data .  As can be seen from the picture ,50 Pieces of data are equally distributed to 10 On a sub table .

notes ： Write it yourself when inserting ID.

thus , Realization MySQL Single database and tables and data sharing .

summary

MySQL Dividing databases and tables is not a necessary step in development , Not required , It depends on your business volume and other comprehensive factors , When there is too much data in your data table, resulting in a file that is too large , You can use the corresponding strategy to slice according to the specific situation of data storage , This can avoid large changes to the code or even solve the problem without changing the code . If you use sub database and sub table according to the policy , The project needs to be modified , And the sub table also increases the complexity of data reading , In particular, multi table joint query . The other thing to note is that , If the time comes when we have to divide the databases and tables , The strategy of designing sub database and sub table must be long-term , Think carefully , In response to subsequent business changes