Re: Deallocate unused (above high water mark)
- From: Mladen Gogala <mladen@xxxxxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 13 May 2004 09:35:06 -0400
Yes, you're right. Here is the procedure:
racle9i Enterprise Edition Release 9.2.0.5.0 - Production
With the Partitioning option
JServer Release 9.2.0.5.0 - Production
SQL> connect scott/tiger
Connected.
SQL> create table emp_test as select * from emp;
Table created.
SQL> analyze table emp_test compute statistics;
Table analyzed.
1* select empty_blocks from user_Tables where table_name='EMP_TEST'
SQL> /
EMPTY_BLOCKS
------------
4
SQL> delete from emp_test;
14 rows deleted.
SQL> commit;
Commit complete.
SQL> analyze table emp_test compute statistics;
Table analyzed.
SQL> select empty_blocks from user_Tables where table_name='EMP_TEST'
2 /
EMPTY_BLOCKS
------------
4
SQL> truncate table emp_test reuse storage;
Table truncated.
SQL> analyze table emp_test compute statistics;
Table analyzed.
SQL> select empty_blocks from user_Tables where table_name='EMP_TEST';
EMPTY_BLOCKS
------------
8
SQL>
Please note that I am operating in an LMT, which means that my extents can only
be
of several pre-defined sizes.
On 05/13/2004 09:20:21 AM, Richard Foote wrote:
> 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@xxxxxxxxxxxxxxx>
> To: <oracle-l@xxxxxxxxxxxxx>
> 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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--
Mladen Gogala
Oracle DBA
Note:
This message is for the named person's use only. It may contain confidential,
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is waived or lost by any mistransmission. If you receive this message in
error, please immediately delete it and all copies of it from your system,
destroy any hard copies of it and notify the sender. You must not, directly or
indirectly, use, disclose, distribute, print, or copy any part of this message
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subsidiaries each reserve the right to monitor all e-mail communications
through its networks.
Any views expressed in this message are those of the individual sender, except
where the message states otherwise and the sender is authorized to state them
to be the views of any such entity.
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