RE: Compressing Export Dumps / WinZip

there is a BIG difference between the "COMPRESS=Y" parameter on an export and compressing a file!

the parameter changes the "create table" statement placed in the export file so that the initial extent is large enough to hold the entire table. It does NOT affect the size of the export dump file in the least.

Compressing a file at the OS level removes "waste" space and (usually) significantly reduces the file size

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|        |                         |
|        |                         |
|        |          BoivinP_at_mar.dfo|
|        |          -mpo.gc.ca     |
|        |                         |
|        |          05/16/2002     |
|        |          11:08 AM       |
|        |          Please respond |
|        |          to ORACLE-L    |
|        |                         |


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  >----------------------------------------------------|
  |                                                    |
  |       To:     ORACLE-L_at_fatcity.com                 |
  |       cc:     (bcc: Rachel Carmichael)             |
  |       Subject:     RE: Compressing Export Dumps /  |
  |       WinZip                                       |
  >----------------------------------------------------|

I don't know whether this is a tangent, but I notice that on the windows platform, "compressed" exports can still get 85% compression when zipping them with WinZip.

Obviously Oracle "compressed=y" doesn't mean "compress the export file", it just means that it places all the segments contiguously in the export file.

Right?

Regards,
Patrice Boivin
Systems Analyst (Oracle Certified DBA)

Systems Admin & Operations | Admin. et Exploit. des systèmes
Technology Services        | Services technologiques
Informatics Branch         | Direction de l'informatique
Maritimes Region, DFO      | Région des Maritimes, MPO

E-Mail: boivinp_at_mar.dfo-mpo.gc.ca

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