There is a workaround when working with Unix and Linux platforms: pipes and IO redirection.
These simple scripts would allow you to compress and decompress dump files 'on the fly'
# mknod exp.pipe p
# gzip < ./exp.pipe > /backups/export.dmp.gz &
# exp user/password full=y file=exp.pipe
log=export.lis statistics=none direct=y consistent=y
# mknod imp.pipe p
# gunzip < /backups/export.dmp.gz > imp.pipe &
# imp file=imp.pipe fromuser=dbuser touser=dbuser log=import.lis commit=y
I've taken statistics for resulting file sizes and compression ratios are between 10% to 20% from original size.
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