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i've installed postgres on ubuntu and am trying to do a pg_dump but get the error message:

"pg_dump: [archiver] WARNING: requested compression not available in this installation -- archive will be uncompressed"

i've read that this is because i didn't install zlib along with postgres.

how can i install zlib for postgres now that postgres is already installed?


EDIT: command:

pg_dump myDb -U myUser --schema=public --format=c --compress=9 > somefile.dmp

it's because of the --format=c, but i would like to have it compressed (which custom (c) does by default).

share|improve this question
Can you post the command line you're using? – James Mar 17 '10 at 9:30
up vote 1 down vote accepted

It's not because of the --format=c, it's because of the --compress=9. You can use custom format without compression.

How did you install your PostgreSQL? If it was from the standard Ubuntu packages, it should have compression. If it was from source, you need to recompile with zlib available - remember to have the developer package. Normally, this would only happen if you explicitly configured it with "--disable-zlib".

share|improve this answer
yes compiled from source, will try re-compiling. thx. – pstanton Mar 17 '10 at 19:59

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