Free table space

Hi,
is there a way to free blocks of deleted record?
I mean: I have a table of 50Gb and I delete 5Gb; those 5Gb are still part of the table size looking at the dba_segment view.
And is there a way to completely free those blocks without export and import the table?
My enviroment is:
Oracle Database 11g Release 11.1.0.6.0 - 64bit Production With the Real Application Clusters option, on Redhat.
Thanks in advance,
Samuel

Hello,
When we move the table within the same tablespace, do we need more space in that tablespace or in the temp tablespace? If you move the Table within the same Tablespace it will use space in that Tablespace during the MOVE (during this step the Tablespace may extend ). Afterwards, the new Segment will use less space as the data will be reorganized. So finally space will be released to the Tablespace.
The TEMP Tablespace will be used when you REBUILD the Indexes (sort operations are done).
When we move table within the same tablespace, it tries to eliminate the fragmentation and move the table to the biggest free space chunk available and frees >the space from the end of the data file, so that we could shrink the data file by doing alter databases data file command. Is that true? With LMT the Extents size are among 64K, 1M, 8M and 64M, it depends on the size of the Table. So the first Extents (64K) may be located in any free spaces of 64K (or more) inside the Tablespace. Also, for larger Extents (1M, ...) enough contiguous free space must be found. If this contiguous free space is not available, the Tablespace will need to extend one of its Datafiles.
So, except if you have a lot of free (and contiguous) spaces inside your Tablespace, you'll likely have Extents at the end of the Datafile and you couldn't reduce its size later.
This is the reason why the safest way to reorganized a Table without extending the Datafiles of its Tablespace is to create a new Tablespace. Then you move the Table inside it and move back to its original Tablespace.
As the Table is likely to become smaller, the original Tablespace could house it without needing any extension.
But, except if this Table had originally Extents at the end of the Datafiles (which is free up by the operation), you couldn't resize your Datafiles.
In general a Table is not alone in the Tablespace. If you want to resize the Datafiles you need to move all the Segments inside the Tablespace to a new one. Then, for instance, you may DROP the old and empty Tablespace and RENAME the new Tablespace so as to give it the same name as the old one.
Depending on the size of the Tablespace it may become a heavy operation and, with LMT (and its internal Extent / Space management) it's not really useful, except if you want to reduce the total size of your database.
Hope this help.
Best regards,
Jean-Valentin
Edited by: Lubiez Jean-Valentin on Apr 10, 2010 5:16 PM

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3                 FROM dba_data_files
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8 dbf_used AS (SELECT SUM(bytes) used_
9                 FROM dba_segments
10                WHERE tablespace_name='TEST'),
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Hans Forbrich
Cleaned up the script and tested with second data file added to verify LMT overhead.

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Hi,
I have a question about free disk space recommendation. My system now has <25% free space at ASP3, I can't see any problems until now, but I think that I can some troubles in the future depending on DB growth, it isn't?
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Thank you!
Best Regards,
André Honma

Generally you do not want to go much higher than 70 to 80% utilization.
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As the previous respondent noted, you should keep track of the growth of your system and then take whatever steps are necessary to bring storage down or increase storage.
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Good luck.
Brian
Message was edited by:
        Brian Sammond

I want to delete approx 100,000 million records and free the space

Hi,
i want to delete approx 100,000 million records and free the space.
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user8731258 wrote:
Hi,
i want to delete approx 100,000 million records and free the space.
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> Rows with a specific condition should be removed and the space
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Free table space

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