RE: cannot get CREATE TABLE AS to work

Well, that explains why I wasn't seeing any appreciable speed increase with
the INITIALLY DEFERRED.  I tried mucking in pg_class, and saw a 3 fold
increase in insert speed on inserts into my table with 2 relational
triggers.  SET CONSTRAINTS ALL DEFERRED does nothing to very little to
increase the insertion speed.  15min 'INITIALLY DEFERRED' vs 13min 'ALL
DEFERRED' vs 5min 'pg_class update'.  And that 15 vs 13 could be machine
activity.

I'll appologize to anyone trying to follow this one sided converstion, as I
wasn't paying attention to the e-mail headers and though Josh was replying
to me only.

Cheers,
Rob

> -----Original Message-----
> 
> Well, you can always add deferrable initially immediate to 
> the constraint
> and run a SET CONSTRAINTS ALL DEFERRED, but I'm not sure 
> that'll actually
> be much faster, it still does a check per row I believe.
> 
> It's hacky, but I'd say, if you don't have other triggers you 
> care about, 
> twiddle pg_class.reltriggers for the class to 0, do the insert, set it
> back to what it was before and then run selects to make sure 
> the data is
> valid (ie, would the constraint have failed).
> 
> [
> assuming one column, something like:
> 
> select * from fktable where not exists
>  (select * from pktable where pktable.pkcol=fktable.fkcol);
> ]
>