PCTFREE and PCTUSED

From: Maryann Atkinson <maryann_30_at_yahoo.com>
Date: Tue, 04 Nov 2003 15:09:25 -0800
Message-ID: <F001.005D5933.20031104150925@fatcity.com>

Suppose I have the following settings which happen to be the defaults as well:

PCTFREE 10
PCTUSED 40 I am trying to figure out what PCTUSED is really used for. My book is telling me that is used so that Oracle knows whether to keep a block in the "free-list".

My point is this: If PCTFREE is 10%, that means the block can be up to 90% full, right?

Well, if the block happens to be 60% full at the moment, then Oracle knows that this block is not full enough because 60 is less than 90, so it can keep it in the free list. I dont see what PCTUSED is needed, it kind of seems I can accomplish the same with just one parm, that being PCTFREE.

But Oracle wouldnt have just put a parm there without any usage, so I guess there's something I dont see...

Any ideas/examples? Any good reasoning anywhere?

Thanks,
maa

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Author: Maryann Atkinson
  INET: maryann_30_at_yahoo.com

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