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ADOdb Load Balancer is a standalone code library that can be integrated into an existing ADOdb code base, and provides the ability to automatically, or manually, force read/write and read-only code segments to run on specific servers. It is currently only available for MySQL database systems. In it's default configuration:
This allows a simple replication system, for example the MySQL replication service, to emulate a cluster configuration, and enhance the performance of the main server by delegating resource-intensive queries to a secondary server.
More complex configurations can be made, including features such as manual assignation of target servers as well as transactional assignation of servers and multiple primaries with a randomized connection pool when used in a cluster configuration.
The Load Balancer works by intercepting the requests made through ADOdb methods, such as execute() and getAssoc(), and based on the method and/or the SQL statement to be executed, assigning the execution of the statement to the appropriate server.
Basic MySql Implementation Implementing ADOdb Load Balancer against a MySql 2 server replication system