Introduction to MySQL optimization

The first layer of optimization effect is the largest ！！！！！

How to optimize ：

1. The upper layer is abnormal
Upper cache of database （ such as Redis） invalid , The best optimization that causes great pressure on the database is to restore the upper cache

2. Reduce queries
Think about whether unnecessary queries fall on the database , Can we reduce

3. Query path optimization
An index is a data structure , It provides an alternative query path for the query optimizer

4. Lock and cache optimization
Avoid big business 、 Long business , Reduce lock , Increase the storage engine layer cache

5. Hardware optimization
Optimize hardware settings ( Operating system layer parameters ) Or the hardware itself . Capacity expansion resources (CPU、 Memory and IO etc. )