RE: quick question on decompressing a table...
- From: "Khedr, Waleed" <Waleed.Khedr@xxxxxxx>
- To: "'oracle-l@xxxxxxxxxxxxx'" <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 18 Feb 2004 18:07:52 -0500
One of the problems in compressed tables is that you can't add columns to
the table.
There are other problems dealing with compressed tables for example parallel
direct loads does not work.
If there is no much data in the table I would simply recreate it.
You need only two steps:
-Creating or loading a new table (you can: create table table-name nologging
parallel 10 <partition clause> as select ).
or create a new partitioned table and use Parallel dml.
-Renaming the tables.
Regards,
Waleed
-----Original Message-----
From: Chris Stephens [mailto:ChrisStephens@xxxxxxxxxx]
Sent: Wednesday, February 18, 2004 5:34 PM
To: oracle-l@xxxxxxxxxxxxx
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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