Overrides the default values for the
read-only transaction parameters (which are set in
the SESAM configuration file), in order to optimize subsequent queries and
guarantee database consistency. The overridden values are used for the
next transaction only. See the SESAM handbook for detailed explanation of
This function can only be called before starting a transaction, not after the transaction has been started already.
TRUE if the values are valid, and the
settransaction operation was successful,