How to compress dmp file in expdp..

Hi All,
I am usign Oracle database 10g, anybody havign any idea of how to compress your dumpfile using expdp then let me know.
I tried with compression option of expdp but the dmp file size is same as I have it without compression.
Thanks..

Hello maybe you can try with this
the command is mknode (with this option you can to comprees at the same time to execute the exp)
ORACLE_HOME=/u01/OH_RDBMS/10.2.0
PATH=$PATH:$ORACLE_HOME/bin:/usr/bin:/usr/local:/bin:.
LD_LIBRARY_PATH=$ORACLE_HOME/lib:.
ORACLE_SID=PSFSHIST
NLS_LANG=American_America.WE8ISO8859P1
export ORACLE_HOME PATH LD_LIBRARY_PATH NLS_LANG ORACLE_SID
#directory
DIR_RESP=/RESPALDO/
fecha=`date +%d.%m.%Y_%Ou`
#drop the last backup
rm $DIR_RESP/*.gz
#create exp
#you can use the pipe for compress the file
mknod $DIR_RESP/exp.pipe p
#compress dmp whit file pipe
gzip < $DIR_RESP/exp.pipe > $DIR_RESP/export_xxxx.dmp.gz &
#El export se manda al archivo tipo pipe
you can change for expdp
exp system/xxxxx@xxxxxxx full=y file=$DIR_RESP/exp.pipe log=$DIR_RESP/export_xxxxx.log statistics=none direct=y consistent=y rows=no
#TERMINA PROGRAMA

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