Re: quick question on decompressing a table...
- From: Connor McDonald <hamcdc@xxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 19 Feb 2004 09:35:13 +0000 (GMT)
Slightly related but common trap for new players.
alter table X move nologging;
will move a table WITH logging and then set it to NOLOGGING. Probably not what
is intended.
Cheers
Connor
--- Tanel_Põder <tanel.poder.003@xxxxxxx> wrote: > If you want to decompress
the existing blocks
as well, then you can just use
> "alter table move nocompress", with nologging and parallel if you want. (but
> test it out on a test table first, I had some problems with it in 9.2.0.1).
>
> Tanel.
>
> ----- Original Message -----
> From: "Freeman Robert - IL" <FREEMANR@xxxxxxxx>
> To: "'Chris Stephens '" <ChrisStephens@xxxxxxxxxx>; <oracle-l@xxxxxxxxxxxxx>
> Sent: Thursday, February 19, 2004 12:38 AM
> Subject: RE: quick question on decompressing a table...
>
>
> > 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....
> >
> > RF
> >
> > -----Original Message-----
> > From: Chris Stephens
> > To: oracle-l@xxxxxxxxxxxxx
> > 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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=====
Connor McDonald
Co-author: "Mastering Oracle PL/SQL - Practical Solutions" - available now
web: http://www.oracledba.co.uk
web: http://www.oaktable.net
email: connor_mcdonald@xxxxxxxxx
"GIVE a man a fish and he will eat for a day. But TEACH him how to fish,
and...he will sit in a boat and drink beer all day"
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