sql-optimization
MySQL Optimizer Statistics: Why Your Queries Choose the Wrong Index
·1600 words·8 mins
A deep dive into MySQL’s InnoDB optimizer statistics and how sampling inaccuracies can lead to poor index selection, causing dramatic performance differences between similar queries. Learn practical solutions to prevent slow SQL queries caused by optimizer misjudgments.
A Hidden Production Issue Discovered Through SQL Optimization
·1101 words·6 mins
When our operations team brought us a complex SQL query that was taking forever to execute, we thought it was just a performance issue. Little did we know, this investigation would uncover a deeply hidden character encoding mismatch that had been silently causing full table scans in our production database.