RE: How to use the Unused Column?
- From: "Mercadante, Thomas F \(LABOR\)" <Thomas.Mercadante@xxxxxxxxxxxxxxxxx>
- To: <Jacques.Kilchoer@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 19 Dec 2006 14:45:14 -0500
Jacques and Michael,
What I meant is from a development point of view, dropping a column and then
adding it back in after the fact isn't that expensive to do.
Sure, if you have a huge table this is a big piece of maintenance on a
production system
But the question was from a development point of view with the developer
thinking he/she was saving some work or something by marking the column unused
and then hoping to get it back again.
Tom
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-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Jacques Kilchoer
Sent: Tuesday, December 19, 2006 2:31 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: RE: How to use the Unused Column?
"Dropping a column is not a significant event" - isn't Oracle rewriting every
used block in the table?
-----Message d'origine-----
De : oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] De la
part de Mercadante, Thomas F (LABOR)
Envoyé : mardi, 19. décembre 2006 11:00
À : Nagarajan.Subbiah@xxxxxxxx; oracle-l@xxxxxxxxxxxxx
Objet : RE: How to use the Unused Column?
Raja,
Drop the column when they tell you to and then add it back in later if
they need it.
Dropping a column is not a significant event. Neither is adding a
column. So just do both or either and tell you developer to stop
reading the docs so much and get back to work. :)
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]
Sent: Tuesday, December 19, 2006 12:19 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: How to use the Unused Column?
One of our developer has asked this question.
"In our project we plan to drop some columns as we anticipate not to use
these columns. We do not want to drop the columns completely out of the
database and completely lose them, instead we would like to use the
unused columns feature in Oracle 10g. From the documentation I have read
so far, I could not find anything that says we can retrieve an unused
column and remove the unused mark against the column making it available
for use"
The development team would like to re-use the column if needed in the
future. Is there a way to do it or Once you set it unused you can't get
the column and data back?
We are at 10.2.0.2 on HP-UX 11.11.
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