RE: Doubts reg :Export and import

Mark,

The COMPRESS=Y option is basically used to combine multiple extents into a single large extent while importing...it is useful when u r trying to defragment the segment.
If u export 5 extents of 100MB using this option, it will b imported as one single extent of 500 MB which means that the initial extent of the storage clause of the extent will b changed to 500M. There is a flipside to this. If u have a large table, and the size of the table is greater than the largest block of free space in ur database, then u wont b able to import it back as one single extent and ur import will fail since extents cannot span datafiles.

Hope this helps.

Samir Sarkar
Oracle DBA - Lennon Team
SchlumbergerSema
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-----Original Message-----
Sent: 03 December 2001 10:50
To: Multiple recipients of list ORACLE-L

OK - This is of no real need for me, so I'm not going to RTFM :P I thought I'd just ask..

When using the compress=y option on an export to import a table of 500Mb to an LMT with a UNIFORM EXTENT size of 100Mb, will it import the table in to 5 extents of 100Mb - or one of 500Mb?

My thought would be that it imports in to 5 extents of 100Mb, but logic sometimes doesn't prevail - so just curious :)

Cheers

Mark

-----Original Message-----
Shrinivas (MED, Keane)
Sent: 01 December 2001 05:10
To: Multiple recipients of list ORACLE-L

If we use compress=y in export, it will compress the whole table table data into a single extent. if not, the table will be exported as is with same extent sizes.

you must be carefule to use compress=y.

'coz in the target, while doing import, your import may fail,if it doesnt find contiguous space to allocate such a big extent for that table.(if the source table is very big)

eg: exported table size is 2 gig. Can your system find 2 Gig contiguous space in the target.? (as this is a single extent)

HTH
Srinivas
-----Original Message-----
Sent: Saturday, December 01, 2001 12:45 AM To: Multiple recipients of list ORACLE-L

The compress=y compesses your brain while it exports, if you dont want you brain compressed then do compress=n. But if your brain is all ready in a compressed state, then they work the opposite.

joe

Alex Hillman wrote:
>
> Another one that apparently has access to e-mail but not to the
internet to
> RTFM :-) . Or maybe s/he knows how to write but cannot read or maybe
can
> read e-mails but cannot read FM etc.
>
> Alex Hillman
>
> > -----Original Message-----
> > From: root_at_fatcity.com [mailto:root_at_fatcity.com]On Behalf Of
sangeetha
> > Sent: Wednesday, November 28, 2001 12:16 PM
> > To: Multiple recipients of list ORACLE-L
> > Subject: Doubts reg :Export and import
> >
> >
> > hi list,
> >
> > what is the exact use of mentioning 'compress' yes
> > or no while exporting....will this store the .dmp file
> > in compressed format in system,if given 'yes'.
> >
> > while importing the dumpfile why is it necessary to
> > give 'fromuser',is 'touser' not enough.
> >
> > sangeetha
> >
> > __________________________________________________
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