I'm having trouble following your question.
Are you asking if you can make the database faster by making more of it stay on the disk instead of in memory? That seems to be the question. If that is what you're asking, the answer is "no". Memory is faster than the disk.
- 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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