Hi Sunil,
Maybe you have already figured out the answer, just to make the conversation complete
.
queueParallelism.maxReceivers is applied for the receive queue for all adapters, you can't set it up particularly for JDBC adapter.
And also if you are on at least PI 7.31 SP11, you can configure parallelism on interface level, details check SAP note 1916598 and this material.
Regards,
Hailong.