Обсуждение: Question

> I am very new to PostgreSQL.  Is it appropriate to pose questions to this
> email list?
> I am trying to come up with a query that will list the names of the database
> indexes that
>
> Have been chosen as clustering indexes.  I know I can get the INDEXRELID
> from PG.INDEX
>
> But have yet to figure out how to get the index name from there.  Any help
> would be appreciated.
>
> And, if this is not an appropriate forum to ask questions please tell me.

I assume this is an appropiate list for this question.  I am sure that pg_general would have
worked also.  With-out knowing the postgresql pg_* schema very well I can be difficult to
determine queries that will give your this sort of information.  In my case I like to cheat.

1) I turn on statement logging.
2) I issue a commands like \d from psql interface
3) Then, I look at the pg_logs to see what sql statement was actually created from "\d"

In your case I would first determine which psql function will give you the information you want
and this use it to give you the query you need.

I hope this helps.

Regards,

Richard Broersma Jr.

On Tue, 7 Nov 2006, Mark Steben wrote:

> I am very new to PostgreSQL.  Is it appropriate to pose questions to this
> email list?

It might be better on pgsql-sql, but I'm not sure.

> I am trying to come up with a query that will list the names of the database
> indexes that
>
> Have been chosen as clustering indexes.  I know I can get the INDEXRELID
> from PG.INDEX
>
> But have yet to figure out how to get the index name from there.  Any help
> would be appreciated.
>
> And, if this is not an appropriate forum to ask questions please tell me.

You want to join on pg_class.oid.  You can see the info on pg_index here in
the docs: http://www.postgresql.org/docs/8.1/static/catalog-pg-index.html

select i.indexrelid,c.relname from pg_index i, pg_class c where i.indexrelid =
c.oid;

will likely give you what you're after.

--
Jeff Frost, Owner     <jeff@frostconsultingllc.com>
Frost Consulting, LLC     http://www.frostconsultingllc.com/
Phone: 650-780-7908    FAX: 650-649-1954

On Tue, 2006-11-07 at 14:27, Richard Broersma Jr wrote:
> > I am very new to PostgreSQL.  Is it appropriate to pose questions to this
> > email list?
> > I am trying to come up with a query that will list the names of the database
> > indexes that
> >
> > Have been chosen as clustering indexes.  I know I can get the INDEXRELID
> > from PG.INDEX
> >
> > But have yet to figure out how to get the index name from there.  Any help
> > would be appreciated.
> >
> > And, if this is not an appropriate forum to ask questions please tell me.
>
> I assume this is an appropiate list for this question.  I am sure that pg_general would have
> worked also.  With-out knowing the postgresql pg_* schema very well I can be difficult to
> determine queries that will give your this sort of information.  In my case I like to cheat.
>
> 1) I turn on statement logging.
> 2) I issue a commands like \d from psql interface
> 3) Then, I look at the pg_logs to see what sql statement was actually created from "\d"

Easier way to cheat:

psql -E dbname

then all the \d commands and what not will spill their secrets right on
the screen.  :)

---> Easier way to cheat:
>
> psql -E dbname
>
> then all the \d commands and what not will spill their secrets right on
> the screen.  :)

Cool,  thanks for the tip.

Thank you, Jeff.  That worked like a champ.  My initial problem
Had to do with not understanding the concept of OID datatypes.
My next learning task is to read up on OID.

Thanks again, Mark

-----Original Message-----
From: jeff@frostconsultingllc.com [mailto:jeff@frostconsultingllc.com]
Sent: Tuesday, November 07, 2006 3:29 PM
To: Mark Steben
Cc: pgsql-admin@postgresql.org
Subject: Re: [ADMIN] Question

On Tue, 7 Nov 2006, Mark Steben wrote:

> I am very new to PostgreSQL.  Is it appropriate to pose questions to this
> email list?

It might be better on pgsql-sql, but I'm not sure.

> I am trying to come up with a query that will list the names of the
database
> indexes that
>
> Have been chosen as clustering indexes.  I know I can get the INDEXRELID
> from PG.INDEX
>
> But have yet to figure out how to get the index name from there.  Any help
> would be appreciated.
>
> And, if this is not an appropriate forum to ask questions please tell me.

You want to join on pg_class.oid.  You can see the info on pg_index here in
the docs: http://www.postgresql.org/docs/8.1/static/catalog-pg-index.html

select i.indexrelid,c.relname from pg_index i, pg_class c where i.indexrelid
=
c.oid;

will likely give you what you're after.

--
Jeff Frost, Owner     <jeff@frostconsultingllc.com>
Frost Consulting, LLC     http://www.frostconsultingllc.com/
Phone: 650-780-7908    FAX: 650-649-1954