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Re: Fuzzy cost comparison to eliminate redundant planning

From: Joe Conway <mail(at)joeconway(dot)com>
To: Neil Conway <neilc(at)samurai(dot)com>
Cc: pgsql-hackers(at)postgreSQL(dot)org, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Subject: Re: Fuzzy cost comparison to eliminate redundant planning
Date: 2004-03-29 05:49:16
Message-ID: 4067B8DC.8070205@joeconway.com (view raw or flat)
Thread:
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


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