Re: Fuzzy cost comparison to eliminate redundant planning - Mailing list pgsql-hackers

From Joe Conway
Subject Re: Fuzzy cost comparison to eliminate redundant planning
Date
Msg-id 4067B8DC.8070205@joeconway.com
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In response to Re: Fuzzy cost comparison to eliminate redundant planning  (Neil Conway <neilc@samurai.com>)
List 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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