MySQL - separate database and table

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One 、 The realization of sub database and sub table

Choose the right middleware ：mycat、shardingsphere
Horizontal sub database , Horizontal sub table , Vertical sub database , Vertical sub table

1、 Vertical sub database

characteristic ： Put a database according to Business Split into different databases
advantage ： Reduce concurrent stress

2、 Horizontal sub table

characteristic ： Put a single sheet of data Distribute to multiple databases according to certain rules
advantage ： Solve storage bottlenecks

Two 、 The principle of sub database and sub table

1、 If you can, try not to
2、 If you want to segment, you must choose the appropriate segmentation rules , Plan ahead
3、 Data segmentation tries to reduce cross database by data redundancy or table grouping Join The possibility of
4、 Because of database middleware to data Join It is difficult to grasp the advantages and disadvantages of realization , And it's very difficult to achieve high performance , Use as few tables as possible for business reading Join

3、 ... and 、 summary

Sub database and sub table	characteristic	advantage
Vertical sub database	Split a database into different databases according to business	Reduce concurrent stress
Horizontal sub table	The data of a single table is distributed to multiple databases according to certain rules	Solve storage bottlenecks