RE: deletion of data from a large table

Great discussion. Reminds me of lazydba list.

Alex Hillman

-----Original Message-----
Sent: Thursday, July 26, 2001 8:43 AM
To: Multiple recipients of list ORACLE-L

Hi folks,

Rick Cale was correct in saying that a truncate would release the storage by default.
The only other option is to drop and recreate the table.

Oracle will only release allocated storage when it is specifically asked to. The overhead on having a process monitoring which space it can drop would be prohibitive and needless. ( Imagine an example where an interface table is constantly filled and emptied - do you really want the storage to be constantly
allocated and deallocated? ).

Coalescing the tablespace will group adjacent free extents together but will have no effect on allocated blocks.

Regards,
Mike Hately,
Oracle DBA

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|        |          "Ramasamy, Baskar"  |
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|        |          07/26/01 01:17 PM   |
|        |          Please respond to   |
|        |          ORACLE-L            |
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  |       Subject:     RE: deletion of data from a large table      |
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Rukmini,

Try to do coalesce on the tablespace on which the table is sitting in after deleting rows.

alter tablespace <TSNAME> coalesce;

Baskar

-----Original Message-----
Sent: 26 July 2001 12:41
To: Multiple recipients of list ORACLE-L

Hi All,

   I have deleted 3 lakhs records from a large table. But there is no effect on tablespace i.e. before I delete the data freespace in TS is 100MB , after deletion also it is showing 100MB. What could be the reason ? How to get the freespace after deleting the data ?
Thanks
rukmini

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