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RE: import question

From: Karniotis, Stephen <Stephen_Karniotis_at_compuware.com>
Date: Mon, 29 Jul 2002 10:23:52 -0800
Message-ID: <F001.004A4E8C.20020729102352@fatcity.com>


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
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-----Original Message-----
Sent: Monday, July 29, 2002 12:20 PM
To: Multiple recipients of list ORACLE-L  

>
> If the Export has been taken with DIRECT = Y, meaning that the SQL
> Evaluation buffer has to be bypassed then Import would not generate the
Redo
> buffer while Importing back the objects and the relevant data.
>

Very interesting, except that I believe you are wrong. ALL of my exports are done with direct=y option. I can demonstrate very easily that there will be 'redo' generated when doing the import by putting the importing database into archivelog mode and turning off the archiver process. If redo is not being produced (as you state), why do I see messages in the alert log telling me that the database is halted because all my redo logs are full and need archiving?
Have a nice day,
Dan Straub
McKesson Information Solutions
541-681-8278
4403'N 12305'W (or thereabouts)
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Author: Karniotis, Stephen
  INET: Stephen_Karniotis_at_compuware.com

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Received on Mon Jul 29 2002 - 13:23:52 CDT

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