Re: Enumeration of tables is very slow in largish database

On Wednesday, January 11, 2012 02:53:06 PM Guillaume Lelarge wrote:
> On Wed, 2012-01-11 at 14:44 +0100, Andres Freund wrote:
> > On Wednesday, January 11, 2012 11:07:23 AM Kirill Müller wrote:
> > > Hi all,
> > >
> > > we have a Postgres/PostGIS database with 100+ schemas and 200+ tables
> > > in each schema, generated automatically. When adding a new PostGIS
> > > layer in QGis, the application obviously enumerates all tables, and
> > > this takes minutes. Even browsing the database in pgAdmin3 is horribly
> > > slow -- it takes several seconds to e.g. open a schema (click on a
> > > schema's "+" in the tree view).
> >
> > Are you actually sure its the database and not just pgadmin thats getting
> > really slow?
> >
> > If you connect via psql and use \dt (see \? for a list of commands) and
> > consorts, is it that slow as well?
>
> \dt won't be as slow as pgAdmin. \dt only gets the table name, owner,
> and stuff like that. Kinda quick. pgAdmin will get also all the other
> informations, like columns, triggers, constraints, functions, types,
> etc.
Yes, sure. My guess is that the gui/pgadmin is the bottleneck and not postgres
itself. Its hard to really do all what pgadmin does at once inside psql
though.

Andres