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Home -> Community -> Mailing Lists -> Oracle-L -> Re: "Deallocate Unused" not releasing space above HWM
Hi All
I am trying to reclaim the wasted space (huge deletes), which are above
the HWM. I had analysed the table before and got the "empty_blocks"
details from dba_tables.
I am using the following query,
alter table tab1 deallocate unused;
and then to bring down the HWM,
alter table tab1 move tablespace AR_DATA; ---- Moved within the same
tablespace
and then I had rebuilt all the corresponding indexes.
As a last step, I had coalesced the tablespace.
Next day (because SMON is not going to clear it up immediately), I had
analyzed the tables again and got the "empty_blocks" details from
dba_tables.
When I look the empty_blocks, for some tables it has not yet released
the space.
Am I missing any steps? I searched Metalink, but it looks like I have
covered everything that needs to be.
I have one more question. To really reclaim the space, do I have to move
the table out of its own tablespace ?
Any thoughts are most welcome.
Thanks and Regards
Vidya
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