How to gain space after Delete

Hi All,
Oracle 9208
I have one table space which is 90% full. I know a table which can give me 10% space if I delete 50% of old data in table. I cannot truncate the table as users are always using the table.
If I delete the rows in TEST env. The tablespace is still 90%, as deleting doesn't release the space. How can we gain the space?
Thanks,

It's allocated space and that can't quite be released, since the table is still fragmented at the extent level. Export/import of the table will solve the problem after specifying 'deallocate unused'
Message was edited by:
FeNiCrC_Neil

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How does release of space after delete/truncate table works? Is the space used before deletion released once delete is complete or not? Will I see the space occupied by deleted table as free in dba_segments or will I need to reorganize the table (drop and recreate again?). Reason why I am asking is that I can see table with 0 rows, but in dba_segment I can see it is occupying few gigabytes....
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Here is a little illustration for you;
SQL> conn ogan/password
Connected.
SQL> create table ogan_deneme as select * from all_objects;
Table created.
SQL> select count(*) from ogan_deneme;
COUNT(*)
    228470
SQL> set line 1000
SQL> set pagesize 1000
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OGAN      OGAN_DENEME          TABLE              SYSTEM                                 854       319981   *30408704*       *1856*         *44*          65536                       1 2147483645                       1               1          854 DEFAULT
SQL> truncate table ogan_deneme;
Table truncated.
SQL> select * from dba_segments where owner='OGAN';
OWNER    SEGMENT_NAME        PARTITION_NAME           SEGMENT_TYPE       TABLESPACE_NAME                HEADER_FILE HEADER_BLOCK      BYTES     BLOCKS    EXTENTS INITIAL_EXTENT NEXT_EXTENT MIN_EXTENTS MAX_EXTENTS PCT_INCREASE FREELISTS FREELIST_GROUPS RELATIVE_FNO BUFFER_
OGAN      OGAN_DENEME           TABLE              SYSTEM                                 854       319981      *65536*          *4*          *1*          65536                       1 2147483645                       1               1          854 DEFAULT
SQL>Hope it Helps,
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Hi All,
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880401 wrote:
Hi All,
Today we deleted large number of rows from one table, but we didn't get free space after that. So for testing purpose, I have created one test tablespace with 5mb size .Created a table and inserted n number of rows in that table and made the tablespace full.I checked in dba_segments(5mb) and dba_free_space tables.It shows perfectly.After that I deleted all the records and try to create a simple table,but it returns (ORA-01658: unable to create INITIAL extent for segment).I read some time back in tom's forum that delete willn't reclaim the space ,instead it will go to freelist of table..Is there any way to reclaim the space?(after delete)
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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How to gain space after Delete

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