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.