I think the app engine engineers should write a detailed book about app engine, or is there a good book about app engine's details on the market? Jaap
On Thu, Sep 3, 2009 at 6:29 PM, Devel63 <danstic...@gmail.com> wrote: > > I've watched this video, so I watched again. At first he says he > thinks filter order might matter, but then corrects himself based on > input from the author of the code to say that filter order has a very > small effect. > > On Sep 2, 5:52 am, Paul Kinlan <paul.kin...@gmail.com> wrote: > > There is a video about building scalable apps by Brett Slatkin onhttp:// > code.google.com/io > > At the end of the video it is hinted (I believe - I could be wrong) that > the > > order of your filters matters, so that means that you should choose key > with > > the highest entropy first (my terminology might be incorrect) but if your > > data is not very unique it should be used later in the merge join query. > > > > Paul > > > > 2009/9/2 Jai <sharma...@gmail.com> > > > > > > > > > Also does it use the keyword histogram to optimize the set- > > > intersection performance(AND queries) in merge-join? > > > > > Regards, > > > Jai > > > > > On Sep 1, 12:07 pm, Devel63 <danstic...@gmail.com> wrote: > > > > I'm seeing very slow times on some merge-join (zig zag) queries, and > > > > just want to confirm that App Engine is smart about these things. > > > > > > In particular, if I have a poperty for which most records have an > > > > identical value, does GAE does have to scan the related entire index > > > > linearly, or, if I'm in the middle of a merge join, does it > > > > intelligently find a good starting point based on the desired __key__ > > > > value? > > > > > > Imagine 1M records with a db.BooleanProperty set to False... > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
