Someone told me DatastoreService.prepare(query).countEntities(); can only count 1000 entities at most.
I solved this problem by applying a shard counter On Feb 4, 7:06 am, David Chandler <[email protected]> wrote: > Or would this would be more efficient if all you need is a count? > > DatastoreService.prepare(query).countEntities(); > > I don't know the answer, but I've been wondering the same thing... > > /dmchttp://turbomanage.wordpress.com > > On Feb 2, 10:05 pm, Max <[email protected]> wrote: > > > Hi, > > > I am designing my data model and planning to use following KeysOnly > > query to perform a count(*) with some filter conditions by a daily > > cron job. > > > FetchOptions fetchOptions = FetchOptions.Builder.withOffset(0).limit > > (Integer.MAX_VALUE); > > DatastoreService.prepare(query).asList(fetchOptions).size(); > > > Here are my questions: > > 1, if I use an ancestor query (in a transaction) over an entity group > > with around 1 million records of this kind, how is the performance? > > > 2, if I use an ancestor query without a transaction (to avoid locking > > whole entity group), how is the performance? > > > 3, if I use a normal query over around 1k entity groups with around 10 > > million records of this kind, how is the performance? > > > Many thanks. -- 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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
