how about batch update using db.put()? following is extracted from http://googleappengine.blogspot.com/2009/06/10-things-you-probably-didnt-know-about.html
For example, take a look at this common pattern: for entity in MyModel.all().filter("color =", old_favorite).fetch(100): entity.color = new_favorite entity.put() Doing the update this way requires one datastore round trip for the query, plus one additional round trip for each updated entity - for a total of up to 101 round trips! In comparison, take a look at this example: updated = [] for entity in MyModel.all().filter("color =", old_favorite).fetch(100): entity.color = new_favorite updated.append(entity) db.put(updated) By adding two lines, we've reduced the number of round trips required from 101 to just 2! - eric 2010/1/14 Patrick Twohig <patr...@namazustudios.com>: > So I'm looking at trying to reset large amounts of data en masse. Say I > want to reset a counter on every account each week, how would I go about > implementing something like that? Would I have to go through each object, > update it, and store it? If that's the case, how do I go about doing so > without killing my quota or running up my usage extremely high? > > Thanks, > Patrick. > > -- > 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-appeng...@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. > >
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