MySQL™: The World’s Most Popular Open Source Database 141 Where are the limits of MySQL? • Database size: Hundreds of gigabytes in practice • Scalability: >90 replication slaves at mobile.de, >2,500 queries per second in a single server at mainchat.de • Features: Subselects in 4.1, Stored Procedures, Triggers, referential integrity of foreign keys in 5.0, then Views – Limitation unimportant in new applications – Porting of existing applications easier to 4.1 and 5.0 • The most important limits of MySQL lie in user perceptions – Decision makers may know little about MySQL and Open Source Copyright 2003 MySQL AB