If there is no risk of contention, you'll probably be fine without an explicit transaction.
If you are on HR, you might want to double check the times with Appstats though. Perhaps doing the fetch and subsequent put in one explicit transaction will perform better than two implicit transactions. (I've not yet double checked with Appstats to be sure its the case or not) Robert On Thu, Mar 3, 2011 at 12:36, stevep <[email protected]> wrote: > Thanks for the replies. I think my code example created confusion > because I used a counter update. Let's say instead that the code is: > > def updateStatus(myKey, myStatus): > entity = myRecs.get_by_key_name(myKey) > entity.staus = status > entity.put() > > Right now I am just calling this function to update the HR entity. I > am not doing it in a transaction such as: > db.run_in_transaction(updateStatus, myKey, myStatus) > > Is it ok to call this update function without doing so as part of a > transaction?? Note that there is no risk of any other calls/updates to > this record so I've got no entity contention issues? > > Otherwise, thanks to Robert for answering my question. > > I'll try to restate it for my situation: For any one key value, I can > only call this function at most once per second. If I have a burst of > update tasks (this is done in a task queue) for 5 different customers > (5 different key values) and the queue manager bursts them through all > at the same time, it will not take 5 seconds elapsed time (not talking > cpu time here) for all five tasks to complete. > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" 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?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine" 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?hl=en.
