The maximum size of an individual entity is 1MB for the datastore - http://code.google.com/appengine/docs/java/datastore/overview.html#Quotas_and_Limits
Apart from that limit, I'm not sure what write limits there are for the datastore for an individual transaction. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine/-/fnlKjFVKwPoJ. 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.