RE: quick question on decompressing a table...

From: Freeman Robert - IL <FREEMANR_at_tusc.com>
Date: Wed, 18 Feb 2004 16:38:25 -0600
Message-ID: <F5E885BEF9540D47A7BDC03CF1688087066D65DF@tuscil_ex1>

Someone might disagree with me, but it strikes me that this is *much* more work than it's worth. Simply alter the table to not use compression. New data will not be compressed and While the data thats in it right now might be in compressed format, any change to that data will result in it's permenant uncompression. Since there isn't much data in it at this point, I would not think that this would be that big of a deal....

-----Original Message-----

From: Chris Stephens
To: oracle-l_at_freelists.org
Sent: 2/18/2004 4:33 PM
Subject: quick question on decompressing a table...

We have a fact table that was mistakenly created with the compression option.
Fortunately there is not (too) much data in the table as of yet.

The table is partitioned and have bitmap indexes on all the foreign keys.

Downtime isn't a huge deal...but minimizing it would be a positive thing.

The easiest way I can think of to correct this is the following:

Create table temp as select * from comp_table nologging;

Drop table comp_table;

Recreate table comp_table

Insert /*+ append */ into comp_table select * from temp_table;

Rebuild bitmaps

Regrant privileges.

...any faster/easier way to do this? ...any gotchas working with compressed tables (not sure how it would relate to this situation)?

...I'm no expert on table compression and as it stands now, r'ing tfm at
this point isn't won't be worth any time savings. I'm mostly just (a little) curious.

Thanks for any suggestions

Chris

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Received on Wed Feb 18 2004 - 16:38:25 CST