Oracle-L: RE: nologging for IOT

From: Igor Neyman <ineyman_at_perceptron.com>
Date: Wed, 05 Nov 2003 07:29:24 -0800
Message-ID: <F001.005D5AB5.20031105072924@fatcity.com>

Yong,

M.b. my question was not clear.
I know, "nologging" doesn't work with IOTs. What I'd like to know, if there are any "tricks" (similar to direct-path) to minimize undo/redo when inserting into IOT.

Igor Neyman, OCP DBA
ineyman_at_perceptron.com

-----Original Message-----
Yong Huang
Sent: Wednesday, November 05, 2003 9:49 AM To: Multiple recipients of list ORACLE-L

Hi, Igor,

Direct-path insert does not work for IOTs. This is documented in SQL Reference
for INSERT.

Whether it works for a table without NOLOGGING set (i.e. LOGGING) is not clear
to me. Documentation says the table has to be NOLOGGING, or its tablespace has
to be so. But Tom Kyte seems to show us that as long as you say INSERT /*+
APPEND */ SELECT, there won't be redo (except for the minimum data dictionary
change), regardless of the table logging setting. See his demo at http://groups.google.com/groups?selm=a3k2kp08q5%40drn.newsguy.com (that message
was not intended to prove my observation). If somebody reads that differently,
please correct me.

Yong Huang

Igor Neyman <ineyman_at_perceptron.com> wrote:
> As it was recently discussed,
>
> Insert /*+ append */ into <destination_table> select * from
> <source_table>
>
> will produce minimum redo/undo if <destination_table> specified as
> "nologging".
>
>
> But, what if <destination_table> is index-organized table?
> Is it possible to achieve the same results (in regards to amount of
> redo/undo)?
>
> Igor Neyman, OCP DBA
> ineyman_at_perceptron.com

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Author: Igor Neyman
  INET: ineyman_at_perceptron.com

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Received on Wed Nov 05 2003 - 09:29:24 CST