MySQL™: The World’s Most Popular Open Source Database 174 High Availability by Replication • MySQL supports many sites that need high reliability – This is done by "mirroring" the data to many machines • The single Master logs all SQL commands that update data • Slaves connect to the master or another slave to read, and rerun the updates • Examples of users are – Yahoo – Slashdot.org – Mobile.de (used car broker, over 300M page views/month) Copyright 2003 MySQL AB