API slow interface analysis

If a user calls your interface , Say your interface is slow , How many angles will you solve this problem ？

1. Whether to deploy in different places , Consider cluster deployment .
2. Personally verify whether it is really slow ？ Call the interface analysis tool , See how long each phase takes , Where is the analysis slow ？
   1. Network problems
   2. Request body , The response is relatively large , Whether it can be optimized
   3. Logical back end business ：
      1. Whether cache is used , Does the cache take effect
         1. No cache is used , Whether cache can be introduced
         2. Introduce caching , Does the cache take effect ,check Cache expiration policy .
      2. Whether there are complex and time-consuming IO operation
         1. Is there a cycle IO The operation of , Can I merge queries to reduce IO frequency
         2. Is there any slow sql, You can do it slowly sql The analysis of monitoring tools shows that . Slow optimization sql
         3. Is there a IO Operation of file , Whether multithreading can be used to solve the problem .
      3. Whether the back-end business logic can be optimized .
      4. Whether the service can be deployed on solid-state drives , Increase the overall speed .
3. The application of distributed deployment needs additional consideration ：
   1. Network problems between distributed services
   2. Optimization strategies for other distributed services