Re: Fuzzy cost comparison to eliminate redundant planning

Joe Conway <mail@joeconway.com>

From: Joe Conway <mail@joeconway.com>
To: Neil Conway <neilc@samurai.com>
Cc: pgsql-hackers@postgreSQL.org, Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-03-29T05:49:16Z
Lists: pgsql-hackers
Neil Conway wrote:
> On 28-Mar-04, at 8:32 PM, Joe Conway wrote:
>> > +      * XXX does this percentage need to be user-configurable?
>>
>> ...but I think the answer to the above is yes.
> 
> Is this really a parameter that we can expect administrators to be able 
> to understand and tune very effectively?

I think so. For one thing, if it were user-controllable, then it could 
be turned off for backward compatible behavior (i.e. 0 means no fuzz).

Joe