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RhoConnect implements a differencing engine on top of redis that can detect deltas as the individual attribute-value level. We call these changesets "sync pages." The differencing engine is designed to be extremely efficient at returning changes in large existing datasets as well as returning large datasets (in the case it is the user's first sync attempt). More about the synchronization work flow and what constitutes a sync page is described here: http://docs.rhomobile.com/rhodes/synchronization
Lars thanks for explanation.