Re: Deallocate unused (above high water mark)

Hi Mladen,

Blocks that have been emptied are *not* considered empty blocks. Empty blocks are only those of the Drew Barrymore variety.

Simple test. Analyze table after you've deleted all the rows and check out the (lack of) difference in the empty_block count.

Cheers

Richard
----- Original Message -----
From: "Mladen Gogala" <mladen_at_wangtrading.com> To: <oracle-l_at_freelists.org>
Sent: Thursday, May 13, 2004 3:45 AM
Subject: Re: Deallocate unused (above high water mark)

Blocks that have been emptied are also considered empty blocks. Alter table deallocate
unused deallocates blocks that, just like Drew Barrymore, have never been kissed or touched
in any other way. It's the same distinction as made by RMAN: it diligently writes the blocks
that have been emptied, but not the blocks that have never been (ab)used.

On 05/12/2004 12:36:08 PM, Sergei wrote:
> Good morning Oracle gurus,
>
> Could somebody please explain why after 'alter table deallocate unused'
> my user_tables view still shows empty blocks?
> At the same time, dbms_space.unused_space procedure shows 0 empty blocks.

--
Mladen Gogala
Oracle DBA



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