Hey Nischal, You could insert some records with known key names in various orders and a common value for a property to query on. If the results come back out key-ordered, that would be a good indication that the method might work. Also, I *think* there are some videos, groups posts, and references in the docs (user or code) mentioning entities in key order.
Robert On Sat, Apr 23, 2011 at 23:59, Nischal Shetty <nischalshett...@gmail.com> wrote: > @Robert Thank you so much! Any idea how I can confirm on the timestamp + key > thingy? I always need it based on timestamp (descending). If that works then > it would help me a lot! > I have looked into exploding indexes. My query would always be equality > checks over list properties exclusively. I'm hoping that would not be a > problem? > Example: > select from post > where listproperty := label1 && listproperty := label2 > sortby time desc > This is what we currently have. If the timestamp thingy is true then we > would be able to remove the last line and that would be so damn cool :) > On 24 April 2011 08:24, Robert Kluin <robert.kl...@gmail.com> wrote: >> >> You probably need to be aware of exploding indexes if you're indexing >> a list property. It is just something you should consider and be >> aware of. >> >> http://code.google.com/appengine/docs/python/datastore/queries.html#Big_Entities_and_Exploding_Indexes >> >> If you're always planning to sort by timestamp, you could consider >> prepending the timestamp on the Post entity keys. Your entities >> should then be returned to the app sorted by timestamp without >> explicitly specifying the sort order. At least that is the case if I >> recall correctly. >> >> >> Robert >> >> >> >> >> On Sat, Apr 23, 2011 at 13:14, nischalshetty <nischalshett...@gmail.com> >> wrote: >> > We're building a new web product. >> > 1. We have the concept of label in them. >> > 2. Each post gets one or more label. >> > 3. The posts have to be displayed sorted according to timestamp in >> > descending order >> > We're making use of List<String> (ListProperty) to save these labels for >> > each post. It's working well for us. We can now query over multiple >> > labels >> > and retrieve posts. >> > However, we need the posts to be sorted on timestamp in descending >> > order. >> > Due to this our query would have the timestamp as the sort order along >> > with >> > the label names. Due to this, we need indexes. And the indexes are being >> > built for combination of the labels and timestamp. >> > So, if our query has 2 labels and the sort order then the index would be >> > built for these. If we query for 3 labels and sort order we would have a >> > new >> > index and so on. >> > I wanted to know if there is any other way such that we can avoid the >> > indexes? Are indexes cool if you anticipate a LOT of data everyday? Is >> > there >> > a way to have the posts sorted based on timestamp in a different way? >> > >> > >> > -- >> > 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. >> > >> >> -- >> 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. >> > > > > > > > > > -- > 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. > -- 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.
