Horton

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

Chris <chrisb@nimrod.itg.telstra.com.au>

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From: Chris Bitmead <chrisb@nimrod.itg.telstra.com.au>
To: Don Baccus <dhogaza@pacifier.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, chris@bitmead.com, pgsql-hackers@postgreSQL.org, pgsql-sql@postgreSQL.org
Date: 2000-02-03T06:07:40Z
Lists: pgsql-hackers 
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.