ideeli is a members-only online shopping club that offers time-limited "flash sales" on designer brands. As traffic increased, ideeli's MySQL database experienced serious performance problems at peak load. Simple queries ran for orders of magnitude longer than they should have. The solution was to upgrade to Percona Server for MySQL and Percona XtraDB Cluster. After upgrading, ideeli has enjoyed higher throughput and stable performance, even though the application has become busier and the traffic to the database has nearly doubled.