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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Export - Compress
why do you need more disk i/o if you have compress off? this is the export
compress, not a Unix or O/S compress.
As I understand it, the compress=y option merely writes the create table statement to the export file so that the initial extent will be the sum of all the extents that had been allocated to that table.
>From: "I.S. Manager" <ismgr_at_pctc.com>
>Reply-To: ORACLE-L_at_fatcity.com
>To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
>Subject: Re: Export - Compress
>Date: Mon, 31 Jul 2000 08:08:35 -0800
>
>That would be very system-dependant. Compression is highly cpu-intensive.
>If you have the system to yourself, that won't be a bottleneck, but on a
>busy system, it could slow things down.
>With compression off, you require more disk i/o. But if your disk
>controller has lots of buffering, this may not be a bottleneck.
>Basically, the answer is non-deterministic, and the only way to find out is
>to test in your environment.
>
>At 07:16 AM 7/31/00 -0800, you wrote:
> >Hi,
> >
> >Small question :
> >
> >Which is fastest, an export with Compress = Y or an export with Compress
>= N
> >???
> >
>
>---
>Dennis Taylor
>---
>The opinions expressed herein are mine. Get your own opinions!
>---
>--
>Author: I.S. Manager
> INET: ismgr_at_pctc.com
>
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