How to increase mob spawn rate?

DECLARE @[Only registered and activated users can see links. Click Here To Register...] FLOAT = 0.75 /*_#2 = 200%, 1 = 100%, 0.5 = 50%*/

UPDATE TRN
SET TRN.dwMaxTotalCount *= @[Only registered and activated users can see links. Click Here To Register...]
FROM Tab_RefNest TRN
JOIN Tab_RefTactics TRT ON TRN.dwTacticsID = TRT.dwTacticsID
JOIN _RefObjCommon ROC ON TRT.dwObjID = ROC.ID
WHERE ROC.CodeName128 LIKE 'MOB%'
AND ROC.Rarity = 0
AND dwDelayTimeMin < 600
AND dwDelayTimeMin != 0
AND dwMaxTotalCount !=