mysql database | database optimization

mysql database | database optimization

1. Common Strategies

• Avoid using select *

• Use left and right joins instead of subqueries

• Joint index instead of temporary table

• Try to use transactions

• Try to use foreign keys

• When using the index, try not to use it, or >etc., don't use it if you can query without a range

• varchar instead of char

• Implicit conversion of data types

  • Implicit conversion of data type: operations such as splicing cause data type to change, such as:
    
    click to see more implicit conversions