The response of the database interface is very slow

One is deployed at tomcat Of springboot project , Recently, all the interfaces related to database suddenly , Return is very slow , It takes several seconds to check a piece of data before returning , Thousands of data take 20 or 30 seconds . Look at the code , These interfaces are very simple single table conditional queries , There are no other complicated operations , The amount of data in the database is also small , I put the interface sql Statement directly into navcat It's executed inside , It all returns in a second . After checking for a long time, I didn't find the reason , I'd like to ask you , Is there any way to check the problem