Re: Query puts 7.3.4 on endless loop but 7.4beta5 is fine. [ with better indenting ]
От | Christopher Browne |
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Тема | Re: Query puts 7.3.4 on endless loop but 7.4beta5 is fine. [ with better indenting ] |
Дата | |
Msg-id | m33cdakhv7.fsf@wolfe.cbbrowne.com обсуждение исходный текст |
Ответ на | Query puts 7.3.4 on endless loop but 7.4beta5 is fine. (<mallah@trade-india.com>) |
Ответы |
Re: Query puts 7.3.4 on endless loop but 7.4beta5 is fine. [ with better indenting ]
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Список | pgsql-performance |
mallah@trade-india.com (Rajesh Kumar Mallah) wrote: > Can you please have a Look at the below and suggest why it > apparently puts 7.3.4 on an infinite loop . the CPU utilisation of > the backend running it approches 99%. What would be useful, for this case, would be to provide the query plan, perhaps via EXPLAIN [Big Long Query]. The difference between that EXPLAIN and what you get on 7.4 might be quite interesting. I would think it quite unlikely that it is truly an "infinite" loop; it is rather more likely that the plan winds up being pretty bad and doing something [a bunch of nested loops, maybe?] that run longer than your patience will permit. -- wm(X,Y):-write(X),write('@'),write(Y). wm('cbbrowne','acm.org'). http://www3.sympatico.ca/cbbrowne/lsf.html Rules of the Evil Overlord #81. "If I am fighting with the hero atop a moving platform, have disarmed him, and am about to finish him off and he glances behind me and drops flat, I too will drop flat instead of quizzically turning around to find out what he saw." <http://www.eviloverlord.com/>
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