23.7. Use Persistent Connections
If you connect to a database with each script, consider using a persistent connection rather than a normal connection. For MySQL users, that is the difference between using mysql_pconnect( ) rather than mysql_connect( ). Persistent connections remain connected even after your script has ended, which means that the next time a script asks for a connection, it uses the one that is already openthis saves a lot of time negotiating passwords and such that can otherwise be used to execute important code.
Switching to persistent connections does not require any other change than adding a "p" in the function namethe parameters are still the same. If your database server is not on the same machine as your web server, consider using CLIENT_COMPRESS as the fifth parameter to your mysql_connect( )/mysql_pconnect( ) call, as it allows MySQL to compress data to save space, and can drastically lower network bandwidth and transfer speed, particularly when reading in lots of data.
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