ismaelbezerra(at)gmail(dot)com writes:
> I'm having problem to drop a database. When performing the drop database
> command postgresql does not release the disk space. The directory with oid
> database remains on disk. This database has been updated from version 9.3.4
> to 9.4.4 with the -k option pg_upgrade. What can it be?
If you forgot to rm -rf the 9.3 database directory after you were finished
upgrading, then all those files are still hard-linked into the 9.3 tree,
so they wouldn't disappear after being dropped from the 9.4 tree.
regards, tom lane