For using persistent connections && being able to sleep, I use:
function close_db_locks_on_abort( ) {
global $conn;
if( connection_aborted() ) {
$fp = fopen( "/tmp/shutdown-func.txt", "a" );
fwrite( $fp, sprintf( "connection aborted on %s\n", date( "d-m-Y H:i:s" ) ) );
if( $conn ) {
OCIRollBack( $conn );
fwrite( $fp, sprintf( "-- DURING CONNECTION! ip=%s, user=%s, page=%s\n", $_SERVER["REMOTE_ADDR"], $_SERVER["PHP_AUTH_USER"], $_SERVER["SCRIPT_FILENAME"] ) );
}
fclose( $fp );
}
}
register_shutdown_function ( "close_db_locks_on_abort" );
This makes sure a rollback is done on a connection when a user hits 'stop', so there will be no locks on table rows.