Open NX.env file and look for MAX_DBAGENT and NX_VIRTDB_AGENTn variables:
@NX_MAX_DBAGENT=6 <=Define SELECT Agents
@NX_VIRTDB_AGENT1= <=Define UPDATE Agents, AGENT#0 is not shown in NX.env.
Max Config Agents : Specifies the maximum number of Select agents to start. The NX_MAX_DBAGENT variable sets this value. In this example, the bpvirtdb_srvr is configured to start up a maximum of 6 SELECT database agents.
Num Agents running :Identifies the total number of UPDATE agents currently connected to the bpvirtdb_srvr process. It is the sum of SELECT and UPDATE agents: MAX_DBAGENT + NX_VIRTDB_AGENTn values.