RE: import question

From: Joe Raube <jraube_at_yahoo.com>
Date: Mon, 29 Jul 2002 11:03:32 -0800
Message-ID: <F001.004A4F2A.20020729110332@fatcity.com>

>From the 8.1.7 docs:

"Direct path Export extracts data much faster than a conventional path export. Direct path Export achieves this performance gain by reading data directly, bypassing the SQL command processing layer and saves on data copies whenever possible.

In a direct path Export, data is read from disk into the buffer cache and rows are transferred directly to the Export client. The evaluating buffer is bypassed. The data is already in the format that Export expects, thus avoiding unnecessary data conversion. The data is transferred to the Export client, which then writes the data into the export file. "

• "Karniotis, Stephen" <Stephen_Karniotis_at_compuware.com> wrote:
  > Dan:
  >
  > I believe the SQL on the outbound is eliminated. With DIRECT=Y,
  > the
  > Kernel performs I/O direct to the DMP file versus generating the
  > SELECT
  > statements to retrieve the data and then write out the data.
  > That's why
  > exports take far less time with DIRECT=Y. You are correct that
  > Redo WILL be
  > generated on the import side.
  >
  > Thank You
  >
  > Stephen P. Karniotis
  > Product Architect
  > Compuware Corporation
  > Direct: (248) 865-4350
  > Mobile: (248) 408-2918
  > Email: Stephen.Karniotis_at_Compuware.com
  > Web: www.compuware.com
  

  ---

Do You Yahoo!?
Yahoo! Health - Feel better, live better http://health.yahoo.com

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Joe Raube
  INET: jraube_at_yahoo.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).

Received on Mon Jul 29 2002 - 14:03:32 CDT