What are the methods to optimize the database?

The following methods can usually be used to optimize the database:

(Recommended tutorial:mysql tutorial)

• Select the most applicable field attributes, reduce the width of the defined fields as much as possible, and try to set the fields to NOTNULL. For example, 'province' and 'gender' are best suited for ENUM

• Use connection (JOIN) To replace subqueries

• Use union (UNION) to replace manually created temporary tables

• Transaction processing

• Lock the table and optimize transaction processing

• Use foreign keys and optimize the locking table

• Create index

• Optimize query statements

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