Shiva, This is normal behaviour. If you dont like this or is causing issues for your App, please look at documenation on using INSTANCE_GROUPS &PARALLEL_INSTANCE_GROUP INSTANCE_GROUPS is a Real Application Clusters parameter that you can specify only in parallel mode. Used in conjunction with the PARALLEL_INSTANCE_GROUP parameter, it lets you restrict parallel query operations to a limited number of instances. Thanks, Ravi. ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Shivaswamy Raghunath Sent: Thursday, May 03, 2007 10:38 AM To: Oracle-L Freelists Subject: Parallel slave on the other nodes - RAC Hello. I am on Redhat Linux. 3 Node RAC. 10.2.0.2. I am using a service to connect to the instance thru sqlplusw. This service is not-TAF Enabled. So no pre-connect nothing. When I make a connection to any of the instances, I see parallel processes/slaves on the other two nodes/instances to which I have not connected. On the other node the process looks like "ora_pz99_* ". I have tried to research this. I have not got much info. But I don't have a clue why this is happening. The parallel parameters are (in case of interest): NAME VALUE ----------------------------------- -------- parallel_adaptive_multi_user TRUE parallel_automatic_tuning FALSE parallel_execution_message_size 4096 parallel_instance_group parallel_max_servers 160 parallel_min_percent 0 parallel_min_servers 12 parallel_server TRUE parallel_server_instances 3 parallel_threads_per_cpu 2 Any insight is appreciated. Thanks, Shiva