I think we are bike-shedding this now :) I seem to recall that if the indexed field is _before_ the non indexed field, its benefit is not lost. I have not looked close at that in a long time.
On Tue, Oct 25, 2011 at 5:42 PM, Woodward, Bob <bob_woodw...@k2sports.com> wrote: > Add a second selection criteria and the benefit of the index is washed > out. > > -----Original Message----- > From: u2-users-boun...@listserver.u2ug.org > [mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Charles > Stevenson > Sent: Tuesday, October 25, 2011 2:39 PM > To: U2 Users List > Subject: Re: [U2] UniBasic Question > > True on UV, too. > Compare output of these using EXPLAIN keyword: > LIST FILE WITH indexed_field = "soemthing" EXPLAIN > LIST FILE WITH indexed_field = "soemthing" EXPLAIN NO.INDEX > > Or forget EXPLAIN, but do it with a large file and notice the speed > differnce. > > On 10/25/2011 4:29 PM, charles_shaf...@ntn-bower.com wrote: >>>> I don't know if I agree that SELECT is faster. If you are using >>>> indexed fields, SELECT is definitely not the good choice. >> Are you saying that when there is an index, the system does not need > to >> read the record at all? It just gets the SELECT list from the index? > Is >> this only true in Unidata? >> >> Charles Shaffer >> Senior Analyst >> NTN-Bower Corporation >> _______________________________________________ >> U2-Users mailing list >> U2-Users@listserver.u2ug.org >> http://listserver.u2ug.org/mailman/listinfo/u2-users >> > > _______________________________________________ > U2-Users mailing list > U2-Users@listserver.u2ug.org > http://listserver.u2ug.org/mailman/listinfo/u2-users > _______________________________________________ > U2-Users mailing list > U2-Users@listserver.u2ug.org > http://listserver.u2ug.org/mailman/listinfo/u2-users > _______________________________________________ U2-Users mailing list U2-Users@listserver.u2ug.org http://listserver.u2ug.org/mailman/listinfo/u2-users
