hi Vardhan,
I am not sure if the db50/dbacockpit list all the parameters. You can verify a parameter with maxdb
dbmcli command:
dbmcli -d <dbsid> -u contron,<password> param_getfull <parameter_name>
I have to say performance tuning is almost impossible to do in this conversation, it needs more
to verify and better to have someone look at the system directly. Did you know SAP has such kind of service called golive check? If you are an SAP customer, you can order this service from SAP.
Best regards,
James