Release : 20.0
Component : CA RC/Query for DB2 for z/OS
All the Edit/Browse requests from RC/Query goes to RC/Edit.
Check if the following options are set.
Asynchronous background fetch options
Enable background fetching ==> Y Y or N
Run in CONTINUOUS or PAUSE mode ==> C C - Continuous mode
P - Pause mode
These option can be found under the RC/Edit Profile Variables.
Since it is a large table and with the above option set,
RC/QUERY tries to get all the records in the background this would cause a spike in CPU usage.
Set the PAUSE option to see if this resolves the High CPU.