Re: table dump

On Tue, 9 Apr 2002, Jodi Kanter wrote:

> I just completed a data only dump of a table by using the following command:
>
> pg_dump genex -Rau -t species > species.sql
>
> I noticed that the first line of the file seems to be disabling some
> postgres trigger. It reads:
>
> UPDATE "pg_class" SET "reltriggers" = 0 WHERE "relname" = 'species';
>
> Then all the data is listed.
>
> At the end of the file the triggers are enabled again with the
> following command:
>
> UPDATE pg_class SET reltriggers = (SELECT count(*) FROM pg_trigger
> where pg_class.oid = tgrelid) WHERE relname = 'species';
>
> Can someone explain why this is happening? The problem is that I am
> coping this dump into another schema creation file that I have. I want
> the data from this particular file included in with my new database.
> However, I am creating this database with a user account so that all
> tables will be owned by that user. I think the problem here is that
> this trigger stuff requires that you be signed in as postgres in order
> to do anything with the pg_class table. correct?

You'd need to be a superuser I'd guess.  The reason for those statmenets
is to turn off foreign key constraints during the load of what's assumed
to be correct data since it came from a dump.  You can ignore them if you
don't have any or don't mind having the constraints run.