You can set the DB Connection Pool parameters as you prefer. The DB2 Web Query Tool suggested defaults are listed below.
IBMConnMgr.Pool=DB2WebQuery
IBMConnMgr.Pool.DB2WebQuery.useServerIdentity=false
IBMConnMgr.Pool.DB2WebQuery.poolType=JDBC
IBMConnMgr.Pool.DB2WebQuery.reapTime=1800
IBMConnMgr.Pool.DB2WebQuery.connectionTimeOut=0
IBMConnMgr.Pool.DB2WebQuery.maxIdleTime=900
IBMConnMgr.Pool.DB2WebQuery.minConnections=2
IBMConnMgr.Pool.DB2WebQuery.maxConnections=2000
IBMConnMgr.Pool.DB2WebQuery.maxAge=-1