Use of MYCAT

Definition ： A database middleware
effect

1. Read / write separation
2. Sub database and sub table ： Sub database divides a database into multiple databases , Table splitting is to divide a table with a large amount of data into multiple tables
3. Integration of multiple data sources

principle

Mycat The most important verb in the principle of is “ Intercept ”, It intercepts what the user sent SQL sentence , First of all, SQL Did some specific analysis ： Such as fragment analysis 、 Route analysis 、 Read write separation analysis 、 Cache analysis, etc , And then put this SQL Real database sent to the back end , And will return the results to do the appropriate processing , Finally, it is returned to the user .

install

Installation mode

1. rpm The way ： need .rpm Installation package , It needs to be installed in sequence
2. yum The way ： Need to connected to the Internet
3. After decompression, you can use
4. Compile and install after decompression

Download package
Address ：https://github.com/MyCATApache/Mycat-download
Try to use the browser to download , You need to copy the download address to Xunlei to download

Installation command

1. decompression ：tar -zxvf Mycat-server-1.6-RELEASE-20161028204710-linux.tar.gz
2. Copy the extracted to /usr/local/ Under the table of contents ：cp -r mycat /usr/local/

conf The configuration file under the directory

1. schema.xml： Define logical library , surface 、 Fragment node and so on
2. rule.xml： Define fragmentation rules
3. server.xml： Define user and system related variables , Such as port, etc