Database Performance Debugging

This handles the standard database performance workflow: enabling slow query logs, identifying problematic queries, and analyzing execution plans across MySQL, PostgreSQL, and SQL Server. You'd reach for it when your app suddenly gets sluggish under load or you're tracking down a performance regression. The quick start gives you actual SQL commands to flip on logging and pull execution stats, which is handy if you don't work with a particular database daily. It won't teach you deep database internals, but it covers the practical debugging cycle most teams need when queries start crawling.