Space reusage after deletion in compressed table

Hi,
Some sources tell, that free space after DELETE in compressed table is not reused.
For example, this http://www.trivadis.com/uploads/tx_cabagdownloadarea/table_compression2_0411EN.pdf
Is it true?
Unfortunatly I cannot reproduce it.

Unfortunatly the question is still open.
In Oracle 9i space, freed after DELETE in compressed block, was not reused in subsequent inserts.
Isn't it?
I saw many evidences from other people. One link I gave above.
But in Oracle 10g I see another figures. After delete rows in compressed blocks, and subsequent insert into that block, block defragmented!
Please, if who know any documentation about change in this behavior, please post links.
p.s.
in 10g:
1. CTAS compress. Block is full.
2. after, deleted every 4 from 5 rows.
avsp=0x3b
tosp=0x99e
0x24:pri[0]     offs=0xeb0
0x26:pri[1]     offs=0xea8 -- deleted
0x28:pri[2]     offs=0xea0 -- deleted
0x2a:pri[3]     offs=0xe98 -- deleted
0x2c:pri[4]     offs=0xe90 -- deleted
0x2e:pri[5]     offs=0xe88 -- live
0x30:pri[6]     offs=0xe80 -- deleted
0x32:pri[7]     offs=0xe78 -- deleted
0x34:pri[8]     offs=0xe70 -- deleted
0x36:pri[9]     offs=0xe68 -- deleted
0x38:pri[10]     offs=0xe60 -- live
0x3a:pri[11]     offs=0xe58 -- deleted
0x3c:pri[12]     offs=0xe50 -- deleted
0x3e:pri[13]     offs=0xe48 -- deleted
0x40:pri[14]     offs=0xe40 -- deleted
0x42:pri[15]     offs=0xe38 -- live
0x44:pri[16]     offs=0xe30 -- deleted
0x46:pri[17]     offs=0xe28 -- deleted
0x48:pri[18]     offs=0xe20 -- deleted
0x4a:pri[19]     offs=0xe18 -- deleted
0x4c:pri[20]     offs=0xe10 -- live
...3. insert into table t select from ... where rownum < 1000;
Inserted rows were inserted in a several blocks. Total number of not empty blocks was not changed. Chains did not occure.
Block above looks as follow:
avsp=0x7d
tosp=0x7d
0x24:pri[0]     offs=0xeb0
0x26:pri[1]     offs=0x776 - new
0x28:pri[2]     offs=0x84b - new
0x2a:pri[3]     offs=0x920 - new
0x2c:pri[4]     offs=0x9f5 - new
0x2e:pri[5]     offs=0xea8 - old
0x30:pri[6]     offs=0xaca - new
0x32:pri[7]     offs=0xb9f - new
0x34:pri[8]     offs=0x34d - new
0x36:pri[9]     offs=0x422 - new
0x38:pri[10]     offs=0xea0 - old
0x3a:pri[11]     offs=0x4f7 - new
0x3c:pri[12]     offs=0x5cc - new
0x3e:pri[13]     offs=0x6a1 - new
0x40:pri[14]     sfll=16
0x42:pri[15]     offs=0xe98 - old
0x44:pri[16]     sfll=17
0x46:pri[17]     sfll=18
0x48:pri[18]     sfll=19
0x4a:pri[19]     sfll=21
0x4c:pri[20]     offs=0xe90 -- old
0x4e:pri[21]     sfll=22
0x50:pri[22]     sfll=23
0x52:pri[23]     sfll=24
0x54:pri[24]     sfll=26As we see, that old rows were defragmented, and repacked, and moved to the bottom of block.
New rows (inserted after compressing of table) fill remaining space.
So, deleted space was reused.

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880401 wrote:
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and also I used to see the tablesize by using dba_segments table.but now it shows 5mb of size for the empty table.Is there any query to get the exact table size?Please help me to understand the concept.
Thanks,JvelDELETE simply deletes the specified rows. The blocks/extetents that were allocated to hold those rows remain allocated. The theory is that if the table once needed sufficient blocks/extents to hold 'x' rows, it may need so again at some time in the future. Allocating and de-allocating extents is a pretty expensive operation, so oracle is not going to waste time and resources constantly doing that just because you delete rows, which is a perfectly normal DML operation. Unless you don't expect that table to grow again, I'd not waste my time trying to reclaim the space.

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baharin wrote:
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Space reusage after deletion in compressed table

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