[MYCAT] Introduction to MYCAT

Mycat

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Mycat What is it?

Mycat It's database middleware , Used to connect to java Program and database

Why Mycat

• java Tightly coupled with database
• High access and high concurrency pressure on the database
• Read / write data requests are inconsistent

Mycat What can be done

1. Read / write separation

2. Data fragmentation

Vertical slice （ sub-treasury ）、 Horizontal slice （ table ）、 vertical + Horizontal split （ Sub database and sub table ）

3. Multiple data source integration

Mycat principle

Mycat The most important verb in the principle of is " Intercept ", It intercepts what the user sent SQL sentence , First of all, SQL The statement does 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 , And finally back to the user .

In this way, the distributed database is decoupled from the code , Programmers can't detect that it is used in the background Mycat still MySQL