How many different kinds of tags are there? Is this an "exploding indexes" situation?
http://code.google.com/appengine/docs/python/datastore/queriesandindexes.html#Big_Entities_and_Exploding_Indexes On Tue, Feb 16, 2010 at 12:34 PM, Max <max.seven....@gmail.com> wrote: > I am sorry but it does not work. With 10000 objects and searching for > 2 tags we got following error. > > com.google.appengine.api.datastore.DatastoreNeedIndexException: The > built-in indices are not efficient enough for this query and your > data. Please add a composite index for this query.. Unable to > determine what index is missing. This is probably a bug in the App > Engine SDK. > > Solution I have proposed is not effecient enough when inserting data. > It may take ~5 seconds per object. > > May be we have to host tag search server outside of google app engine. > > :( > > or decrease number of tags to minimum > > On Feb 12, 2:22 pm, Max <max.seven....@gmail.com> wrote: > > Thank You very much it works! > > > > correct code is:- > > query.setFilter("tags == 'hello' && > > tags == 'world'"); > > > > I hope it will work with thousands and millions of records as well. I > > have not tested with large number of data yet. > > > > Thanks again! > > > > On Feb 12, 2:46 am, John Patterson <jdpatter...@gmail.com> wrote: > > > > > > > > > On 12 Feb 2010, at 06:53, Max wrote: > > > > > > I have not coded much in native API but I think it will search first > > > > for hello and then for world then mix results. > > > > > No, it does a "merge join" - only returning entities that match all > > > filters - not separate queries like the JDO contains() creates. > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > google-appengine-j...@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine-java+unsubscr...@googlegroups.com<google-appengine-java%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > > -- Ikai Lan Developer Programs Engineer, Google App Engine http://googleappengine.blogspot.com | http://twitter.com/app_engine -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
