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... /dmc http://turbomanage.wordpress.com On Feb 2, 10:05 pm, Max <thebb...@gmail.com> 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 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.
