Re: Thanks, naming conventions, and count()

On Sun, 29 Apr 2001, Bruce Momjian wrote:

> > > I think parsing the file contents is too hard. The database would have
> > > to be running and I would use psql.
> >
> > I don't know, I recovered someone's database using a "raw" connection ...
> > wasn't that difficult once I figured out the format *shrug*
> >
> > the following gets the oid,relname's for a database in the format:
> >
> > echo "select oid,relname from pg_class" | postgres -L -D /usr/local/pgsql/data eceb | egrep "oid|relname"
> >
> > then just parse the output using a simple perl script:
> >
> > 1: oid = "163338" (typeid = 26, len = 4, typmod = -1, byval = t)
> > 2: relname = "auth_info_uid_key" (typeid = 19, len = 32, typmod = -1, byval = f)
> > 1: oid = "163341" (typeid = 26, len = 4, typmod = -1, byval = t)
> > 2: relname = "auth_info_id" (typeid = 19, len = 32, typmod = -1, byval = f)
> > 1: oid = "56082" (typeid = 26, len = 4, typmod = -1, byval = t)
> > 2: relname = "auth_info" (typeid = 19, len = 32, typmod = -1, byval = f)
>
> Oh, you did a direct postgres backend connect. Yes, that will work
> fine. Good idea if the postmaster is down. I originally thought you
> meant reading the pg_class file raw. Of course, that would be really
> hard because there is no way to know what numeric file is pg_class!

But would it work on a crashed database that won't come up or doesn't
the direct connect care about any other tables in this usage?

Vince.
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