Обсуждение: Confused About pg_* Tables
I'm confused about how I'm able to access the following pg_* tables regardless of connected database. I thought these tables were hidden or stored in the 'postgres' database but I'm still able to access this data regardless of which database I'm connected to: Code: zoo=# SELECT * FROM pg_user; usename | usesysid | usecreatedb | usesuper | usecatupd | userepl | passwd | valuntil | useconfig ----------+----------+-------------+----------+-----------+---------+----------+----------+----------- postgres | 10 | t | t | t | t | ******** | | carlos | 16384 | t | t | t | t | ******** | | (2 rows) When I use my tab key in 'psql' after the 'FROM' statement, I'm presented with a ton of what I presume to be tables however when I check for tables in the 'postgres' database, I get nothing. I'm confused... Code: psql (9.1.1, server 9.1.1) You are now connected to database "postgres". postgres=# \d No relations found.
On Fri, Oct 14, 2011 at 6:06 PM, Carlos Mennens <carlos.mennens@gmail.com> wrote:
I'm confused about how I'm able to access the following pg_* tables
regardless of connected database. I thought these tables were hidden
or stored in the 'postgres' database but I'm still able to access this
data regardless of which database I'm connected to:
Code:
zoo=# SELECT * FROM pg_user;
usename | usesysid | usecreatedb | usesuper | usecatupd | userepl |
passwd | valuntil | useconfig
----------+----------+-------------+----------+-----------+---------+----------+----------+-----------
postgres | 10 | t | t | t | t |
******** | |
carlos | 16384 | t | t | t | t |
******** | |
(2 rows)
When I use my tab key in 'psql' after the 'FROM' statement, I'm
presented with a ton of what I presume to be tables however when I
check for tables in the 'postgres' database, I get nothing. I'm
confused...
Code:
psql (9.1.1, server 9.1.1)
You are now connected to database "postgres".
postgres=# \d
No relations found.
These objects are in the schema pg_catalog not public
On Fri, Oct 14, 2011 at 6:57 PM, Julien Rouhaud <rjuju123@gmail.com> wrote:
On Fri, Oct 14, 2011 at 6:06 PM, Carlos Mennens <carlos.mennens@gmail.com> wrote:I'm confused about how I'm able to access the following pg_* tables
regardless of connected database. I thought these tables were hidden
or stored in the 'postgres' database but I'm still able to access this
data regardless of which database I'm connected to:
Code:
zoo=# SELECT * FROM pg_user;
usename | usesysid | usecreatedb | usesuper | usecatupd | userepl |
passwd | valuntil | useconfig
----------+----------+-------------+----------+-----------+---------+----------+----------+-----------
postgres | 10 | t | t | t | t |
******** | |
carlos | 16384 | t | t | t | t |
******** | |
(2 rows)
When I use my tab key in 'psql' after the 'FROM' statement, I'm
presented with a ton of what I presume to be tables however when I
check for tables in the 'postgres' database, I get nothing. I'm
confused...
Code:
psql (9.1.1, server 9.1.1)
You are now connected to database "postgres".
postgres=# \d
No relations found.
I forgot, type \dS to show system objects.
Carlos Mennens <carlos.mennens@gmail.com> writes:
> I'm confused about how I'm able to access the following pg_* tables
> regardless of connected database. I thought these tables were hidden
> or stored in the 'postgres' database but I'm still able to access this
> data regardless of which database I'm connected to:
The underlying "pg_authid" catalog is a shared catalog that can be seen
from any database in the installation, just like pg_database. pg_user
is a view on this catalog, and so not shared in itself, but nonetheless
you'll see the same contents from every database.
regards, tom lane