This extension has no configuration directives defined in php.ini.
    You may be interested in seeing the SQL statements that are generated 
    in order to apply changes back to the database. At the top of the
    SDO/DAS/Relational.php
    you will find a number of constants which control whether the process 
    of constructing and executing the SQL statements is to be traced.
    Try setting
    DEBUG_EXECUTE_PLAN
    to TRUE to see the generated SQL statements.