( Replication Intro

Info Catalog ( Replication ( Replication ( Replication Implementation
 6.1 Introduction to Replication
 MySQL 3.23.15 and up features support for one-way replication.  One
 server acts as the master, while one or more other servers act as
 slaves.  The master server writes updates to its binary log files, and
 maintains an index of the files to keep track of log rotation.  These
 logs serve as a record of updates to be sent to slave servers.  When a
 slave server connects to the master server, it informs the master of
 its last position within the logs since the last successfully
 propagated update.  The slave catches up any updates that have occurred
 since then, and then blocks and waits for the master to notify it of
 new updates.
 A slave server can also serve as a master if you want to set up chained
 replication servers.
 Note that when you are using replication, all updates to the tables
 that are replicated should be performed on the master server.
 Otherwise, you must always be careful to avoid conflicts between
 updates that users make to tables on the master and updates that they
 make to tables on the slave.
 One-way replication has benefits for robustness, speed, and system
    * Robustness is increased with a master/slave setup.  In the event
      of problems with the master, you can switch to the slave as a
    * Better response time for clients can be achieved by splitting the
      load for processing client queries between the master and slave
      servers.  `SELECT' queries may be sent to the slave to reduce the
      query processing load of the master. Statements that modify data
      should still be sent to the master so that the master and slave do
      not get out of sync.  This load-balancing strategy is effective if
      non-updating queries dominate, but that is the normal case.
    * Another benefit of using replication is that you can perform
      backups using a slave server without disturbing the master. The
      master continues to process updates while the backup is being made.
Info Catalog ( Replication ( Replication ( Replication Implementation
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