Re: existence of user - Mailing list pgsql-novice

On Saturday 02 February 2002 08:30 pm, Annie Bai wrote:
> Hi Steve,
>
> How can I access the system databases? when I use '\l', i can only get
> those databases created by specific users. Is there a particular directory
> holding all the system databases?
>
> Thanks a lot
>

Hi Annie,

Well I will probably have to defer to those with more experience of PG
than me (quite a list!)

I get this...

si@guinness > psql -l
        List of databases
 Database  |  Owner   | Encoding
-----------+----------+-----------
 bugdb     | testuser | SQL_ASCII
 nrgdb     | si       | SQL_ASCII
 template0 | postgres | SQL_ASCII
 template1 | postgres | SQL_ASCII
(5 rows)


I am guessing when one creates a database, the template information
is copied across and PG then holds separate instances of system tables
in each database.

So, as for system databases, I guess you mean system tables in the databases
you have created?

Do you get the 'template' databases listed above?

I don't know the details but I can only 'connect' to template1,
not template0.

You'll get an explanation for this I am sure; there are some
great people on this list.

Hope I have pointed you in a good direction at least.

s.




>
> From: Stephen Ingram <ingram@samsix.com>
>
> >Reply-To: ingram@samsix.com
> >To: "Annie Bai" <annie_job@hotmail.com>, pgsql-novice@postgresql.org
> >Subject: Re: [NOVICE] existence of user
> >Date: Sat, 2 Feb 2002 19:35:27 -0500
> >
> >On Saturday 02 February 2002 07:18 pm, Annie Bai wrote:
> > > Hi,
> > >
> > > After I used 'create user', Is there a database to keep all the
> >
> >information
> >
> > > about users? How can i check the existence of users?
> > >
> > > Thanks,
> > > Yan
> >
> >Hi,
> >
> >Sure. Check out the pg_user table.
> >
> >Postgres 'system' tables all seem to start with 'pg_'
> >
> >si@guinness > psql -c "select * from pg_user"
> >  usename  | usesysid | usecreatedb | usetrace | usesuper | usecatupd |
> >passwd  | valuntil
> >----------+----------+-------------+----------+----------+-----------+----
> >------+---------- postgres |       26 | t           | t        | t
> > | t         | ******** |
> >  si       |       27 | t           | f        | t        | t         |
> >******** |
> >  nrg      |       30 | t           | f        | t        | t         |
> >******** |
> >  testuser |       28 | t           | f        | t        | t         |
> >******** |
> >  sm       |       31 | t           | f        | t        | t         |
> >******** |
> >  tc       |       32 | t           | f        | t        | t         |
> >******** |
> >  nrgadmin |       33 | t           | f        | t        | t         |
> >******** |
> >  dude     |       29 | t           | f        | t        | t         |
> >******** |
> >  ken      |       34 | t           | f        | t        | t         |
> >******** |
> >(9 rows)
> >
> >steve
> >
> > > _________________________________________________________________
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