For MySQL the connection parameters are the same as the schema options. The refresh rate determines the sampling interval.
The following SQL is used to sample the transaction rate.
show global status where Variable_name = 'Com_commit' or Variable_name = 'Com_rollback'
Note that Com_commit is used instead of the handler_commit value used in previous releases of HammerDB as a result of MySQL Bug #52453 handler_commit is incremented for InnoDB SELECT queries.