"Cost" in query plans is just about the most useless piece of junk information ever created. Really. I'm not exaggerating. Most of the time, it's about as useful in performance tuning as a marching band would be.
Have you checked the time stats on them as well as the IO stats?
- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
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"Nobody knows the age of the human race, but everyone agrees it's old enough to know better." - Anon