"Christian Rengstl" <Christian.Rengstl@klinik.uni-regensburg.de> writes:
> when i issued the following command: pg_dump -d mydb -Fc -Z9 -U dbadmin > base_backup.tar
> i keep getting warning messages: pg_dump: [custom archiver] WARNING: ftell mismatch with expected position -- ftell used.

This is definitely not very cool. What platform are you on exactly
(particularly, libc or glibc version), and what PG version is this?
Can you make up a self-contained test case --- perhaps a script that
fills a database with junk data that will produce the problem when
dumped?

regards, tom lane

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