Poul Kristensen <bcc5226(at)gmail(dot)com> writes:
> One off my Postgres installations shows no data directory in the ps.
> I think it is a good thing, but can't see any difference in the
> postgresql.conf in the name data_directory in pg_settings when comparing to
> other Postgres installations.
Postgres itself wouldn't ever take any action to show (or hide) that
information in "ps" output. I suppose that some of your postmasters
were started with an explicit -D switch on their command line and
some were not, and that that is the cause of the difference you're
seeing.
regards, tom lane