Hi Sergei! nice :) i'm reading about it just one doubt i didn't understand everything yet there's a read time and a scan time, what the difference? read = sequencial read and scan = non sequencial read? or something like table read cost, index read cost?
2014-05-27 5:41 GMT-03:00 Sergei Golubchik <[email protected]>: > Hi, Roberto! > > On May 26, Roberto Spadim wrote: > > hi guys, one question, that maybe at the right time could be answered... > > with the new cost model, maybe at explain we could have a new information > > about how many time we will expend? and maybe something like, estimate > time > > / executed time (via show warnings?) > > i will read the patch about this work, and check if i could help with > > something like this > > is it interesting? > > First, it's not about creating a new cost model. Only about providing > more adequate real-life values to certain parameters in the current cost > model. > > And yes, the work could, possibly, help to estimate the query execution > time. Although this wasn't the goal, we only wanted to find correct > relative values, not absolute. > > Regards, > Sergei > > -- Roberto Spadim SPAEmpresarial Eng. Automação e Controle
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