David Staudt | The classic problem with using change timestamp fields is if the record gets completely deleted, a query like 'select * from table where timestamp > last_time_we_checked' you can't discover the deletion. UCM 9 and higher includes new AXL APIs for setting up change notification subscriptions (initial only for device/line/user) - prior to that, keeping large, dynamic data sets synced between UCM and apps has always been a very difficult, i.e. timed bulk polling. |
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