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Message from discussion Preventing delayed block cleanout due to loading a datawarehouse
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Randolf Geist  
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 More options Apr 20 2011, 5:37 am
Newsgroups: comp.databases.oracle.server
From: Randolf Geist <mah...@web.de>
Date: Wed, 20 Apr 2011 02:37:56 -0700 (PDT)
Local: Wed, Apr 20 2011 5:37 am
Subject: Re: Preventing delayed block cleanout due to loading a datawarehouse
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On Apr 19, 2:51 pm, Donatello Settembrino

<donatello.settembr...@gmail.com> wrote:
> Exactly, that's right

By the way - we digress - my comment about PCTFREE is irrelevant in
this case since Oracle will stuff this row into a single block no
matter what the PCTFREE setting is as long as the row fits into the
block.

And: You don't have chained rows but your test case is flawed: A
select count(*) never reports "table fetch continued row" because it
does not have to visit the columns but only accesses the row entries
in the row directory. So even with chained rows your test will not
report any "table fetch continued row" statistics. You would need to
count/access a column that is part of the "chained" row pieces - and
it would have to be nullable, otherwise recent versions of Oracle will
transform a count(col) to a count(*).

Randolf


 
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