Re: [HACKERS] Re: [SQL] Proposed Changes to PostgreSQL

> Don Baccus wrote:
> > 
> > At 09:55 PM 2/2/00 -0500, Tom Lane wrote:
> > 
> > >There is also a nontrivial performance penalty that would be paid
> > >for reversing this default, because then every ordinary SQL query
> > >would suffer the overhead of looking to see whether there are
> > >child tables for each table named in the query.  That *really*
> > >doesn't strike me as a good idea.
> > 
> > Thank you for pointing this out, because my first reaction to
> > the proposal was "what's the overhead for SQL users"?
> 
> 
> I just did a performance check on this. I found that the overhead
> is one tenth of a millisecond on a Sun desktop workstation. Pretty
> trivial, and I'm sure it can be improved.

Good point.  Has to be non-mearurable performance penalty because most
people don't use it.  Maybe you will need a system cache entry for this.

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