Re: COPY TO '|gzip > /my/cool/file.gz'
Re: COPY TO '|gzip > /my/cool/file.gz'
От:
Vibhor Kumar <vibhor.kumar@enterprisedb.com>
Дата:
On Jul 20, 2011, at 11:29 PM, wrote: > From May 31, 2006; 12:03pm . . . > > "It struck me that we are missing a feature that's fairly common in Unix programs. > Perhaps COPY ought to have the ability to pipe its output to a shell command, > or read input from a shell command. " > Maybe something like: > COPY mytable TO '| gzip >/home/tgl/mytable.dump.gz'; > > Is such a feature (ie being able to tell postgres to write a compressed file via COPY TO) being worked on ? > You can use STDOUT to pipe output to a shell command and STDIN to read input from shell command. Something like given below: psql -c "COPY mytable to STDOUT"|gzip >/home/tgl/mytable.dump.gz cat filename|psql -c "COPY mytable from STDIN;" OR psql -c "COPY mytable from STDIN;" < filename Thanks & Regards, Vibhor Kumar EnterpriseDB Corporation The Enterprise PostgreSQL Company Blog: http://vibhork.blogspot.com
Re: COPY TO '|gzip > /my/cool/file.gz'
От:
Craig Ringer <craig@postnewspapers.com.au>
Дата:
On 21/07/11 01:59, david.sahagian@emc.com wrote: > From May 31, 2006; 12:03pm . . . > > "It struck me that we are missing a feature that's fairly common in Unix programs. > Perhaps COPY ought to have the ability to pipe its output to a shell command, > or read input from a shell command. " > Maybe something like: > COPY mytable TO '| gzip >/home/tgl/mytable.dump.gz'; > > Is such a feature (ie being able to tell postgres to write a compressed file via COPY TO) being worked on ? Not that I've heard of. In addition to the hint given about using copy to stdout from a "psql -c" invocation, there is another option. You can create a named pipe (fifo) file node and use COPY TO to write to it. eg: $ mkfifo gzfifo; gzip < gzfifo > out.gz & $ psql -c "COPY tablename TO '/server/path/to/gzfifo';" gzip will automatically terminate when the output file is closed. The fifo will not be removed and can be re-used. Supporting COPY to a pipe would be interesting, though the security implications would need plenty of thought. -- Craig Ringer
Re: COPY TO '|gzip > /my/cool/file.gz'
От:
Willy-Bas Loos <willybas@gmail.com>
Дата:
On Wed, Jul 20, 2011 at 8:53 PM, Vibhor Kumar wrote: > You can use STDOUT to pipe output to a shell command and STDIN to read input from shell command. > Something like given below: > psql -c "COPY mytable to STDOUT"|gzip >/home/tgl/mytable.dump.gz > > cat filename|psql -c "COPY mytable from STDIN;" > > OR psql -c "COPY mytable from STDIN;" < filename nice one, that works great! (zcat instead of cat, though) -- "Patriotism is the conviction that your country is superior to all others because you were born in it." -- George Bernard Shaw
COPY TO '|gzip > /my/cool/file.gz'
От:
<david.sahagian@emc.com>
Дата:
From May 31, 2006; 12:03pm . . .
"It struck me that we are missing a feature that's fairly common in Unix programs.
Perhaps COPY ought to have the ability to pipe its output to a shell command,
or read input from a shell command. "
Maybe something like:
COPY mytable TO '| gzip >/home/tgl/mytable.dump.gz';
Is such a feature (ie being able to tell postgres to write a compressed file via COPY TO) being worked on ?
-dvs-
