What is the best gzip ratio by using pipe to export

Hello,
I try to use data pump to export a core application schema. (10Gdb 10.2.0.4)
I use 'estimate' parameter of expdp before real export, and get future dump file size
will be 235GB.
the only issue is that my largest file system size is 34GB, so seems like I have to use
pipe to zip while exporting...
the action plan is like below:
1 make a unix pipe
$ mknod /faj29/appl/oracle/exports/scott1 p
2.driect pipe to .dmp
nohup gzip -5c < scott1 > /faj29/appl/oracle/exports/ODS.dmp.gz & ===>quesiton is here?
3. create a par
userid=system/password@dbname
SCHEMAS=xxx
DUMPFILE=scott1
LOGFILE=dpump_emrgods:exp_xxx.log
COMPRESSION=NONE
CONTENT=ALL
ATTACH=xxx.EXPORT.job
nohup expdp PARFILE=exp_xxx.par &
My quesiton is based the information I provided, (34GB filesystem size vs 235GB dumpfile size)
how much zip extent shoud I use?
gzip -5c or gzip -9c
seems like -9c is very time consuming, this why I don't like to use it. but I don't know
zip ratio, so any friend knows?
or do we have better way to do this task?
(seems like I can not use parallel export by using pipe, if yes, how?)
thanks a lot
Jerry
Edited by: jerrygreat on May 8, 2009 9:00 AM

Hello,
I am wrong, the pipe won't work with expdp at all.
it is unlike the process with the older EXP tool, which you could tell to write to a named pipe and the data written to the named pipe could be compressed—all in one step.
So can I use parameter 'compression'???
--it seems like to only to compress meta data? not for dump file...?
(but I want to compress my expected 235G dump file to fit one 34G filesystem)
Any idea?
regards,
Jerry

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What is the best gzip ratio by using pipe to export

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