TABLE SIZE NOT DECREASING AFTER DELETION. BLOCKS NOT BEING RE-USED

Hi ,
Problem:
Table size before deletion: 40GB
Total rows before deletion: over 200000
Rows deleted=190000 rows
Table size after deletion is more (as new data was inserted meanwhile).
Purpose of table:
This table is a sort of transaction table.
Whenever an SR is raised by CSR, data gets inserted into this table and is removed when the status is cleared.
So there is constant insertion and purging will happen on this table.
We are using ASSM and tablespace is LOCAL.
This Table has a LONG column also.
Is this problem because of LONG column ?
So here there are 2 problems.
1) INSERTs are not using the space created by DELETE.
2) New INSERTs are taking much more space then expected ?
Let me have your suggestion
Thanks,

I think when you do DELETE it removes the data but
it's not releasing any used space and it's still
marked as used space. I think reorganizing would help
to compress and pack all block and relase any unused
space in blocks. Why do you think that? Deleting data will create space that can be reused by subsequent insert/ update operations. It is not going to release space back to the tablespace to make it available for inserts into other tables in the tablespace, but that's not generally an issue unless you are permanently decreasing the size of a table, which is pretty rare.
Would you also please explain about different about
LOB and LONG ? or point me to any link which explain
baout it.From the Oracle Concepts manual's section on the LONG data type
"Note:
Do not create tables with LONG columns. Use LOB columns (CLOB, NCLOB) instead. LONG columns are supported only for backward compatibility.
Oracle also recommends that you convert existing LONG columns to LOB columns. LOB columns are subject to far fewer restrictions than LONG columns. Further, LOB functionality is enhanced in every release, whereas LONG functionality has been static for several releases."
LONG was a very badly implemented solution to storing large amounts of data. LOBs are a much, much better designed solution-- you should always be using LOBs.
Justin

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hi All,
this the example from Tom's book <<expert oracle database architecture>>, may anyone explain why the leaf_block oes not decrease to 523 after delete.
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COUNT(*)
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4 dbms_space.free_blocks
5 (
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11 );
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2 l_freelist_blocks number;
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4 dbms_space.free_blocks
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       1043Edited by: Sidney Chen on Aug 15, 2009 3:10 PM

Sidney Chen wrote:
hi All,
this the example from Tom's book <<expert oracle database architecture>>, may anyone explain why the leaf_block oes not decrease to 523 after delete.It's just the way it works - when a leaf block is emptied it is linked into the freelist, but also stays linked into the correct place in the index structure. It will be detached from the structure by a coalesce, or when Oracle needs to use a free block to handle new data.
If you want a couple of reasonable guesses why:
<ul>
a) it probably makes read-consistency of indexes easier to deal with
b) unlinking a block from the structure is expensive (you have to modify the blocks to the left, the right, and above) so Oracle takes the gamble that you're likely to re-insert data in the same block in the near future.
</ul>
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"Science is more than a body of knowledge; it is a way of thinking"
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Table space not reduce after delete in oracle 11G

Hi Team,
I have a DB 11.1.0.7 on unix.
I have execute delete tables on tablespace, but this not reduce.
Thanks

935299 wrote:
What segment space management type is defined for the tablespace in question?
MANUAL
Then you should check out the documentation some more.
But even if you shrink the table segement what is that going to do for the data file size?
I don't undertand you.
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Baharin

baharin wrote:
Hi..
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Subject : PO Release Strategy not changed after deletion of few line items with less Total PO
Dear Friends
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marked as used space. I think reorganizing would help
to compress and pack all block and relase any unused
space in blocks. Why do you think that? Deleting data will create space that can be reused by subsequent insert/ update operations. It is not going to release space back to the tablespace to make it available for inserts into other tables in the tablespace, but that's not generally an issue unless you are permanently decreasing the size of a table, which is pretty rare.
Would you also please explain about different about
LOB and LONG ? or point me to any link which explain
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LONG was a very badly implemented solution to storing large amounts of data. LOBs are a much, much better designed solution-- you should always be using LOBs.
Justin

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Hi..
Based on my system, i have found that my oracle table space did not reduce after the deletion query. Why ?.. Could somebody help me. As your info, I am using oracle 10g.
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