> On Jul 7, 2019, at 5:22 PM, Tom Mercha <mercha_t@xxxxxxxxxxx> wrote: > > Hi All > > As we know, a query goes through number of stages before it is executed. > One of these stages is query optimization (QO). > > There are various parameters to try and influence optimizer decisions > and costs. But I wanted to measure the effect of such a stage by turning > it off completely and I can't find such a parameter which explicitly > does that. Then I could execute a query to get the effect of "QO active > and "QO inactive" and compare. > > Obviously, I know well what the results would generally look like but I > am just interested in measuring the differences for various types of > queries. I am also aware that this is a simple comparison - there are > more interesting comparisons to perform with QO tweaks, but right now I > am interested in something basic. > > So how would one shut down QO? Or at least, obtaining the guarantee of > generating the worst plan possible, ideally without touching many > parameters? > > Best, > Tom Drop all indices?
