I have implemented data sync using MS Sync framework 2.1 over WCF to sync multiple SQL Express databases with a central SQL server. Syncing is happening every three minutes through a windows service. Recently, we noticed that huge amounts of data is being exchanged over the network (~100 MB every 15 minutes). When I checked using Fiddler, the client calls the service with a GetKnowledge request four times in a session and each response is around 6 MB in size, although there are no changes at all in either database. This does not seem to be normal? How do I optimize the system to reduce such heavy traffic? Please help.
I have defined two scopes with first one having 15 tables all download only. The second one has 3 tables with upload only direction.
The XML response has a very huge number of <range> tags under coreFragments/coreFragment/ranges tag which is the major portion contributing to the response size.
Let me know if any additional information is required.
must be the sync knowledge. do you do lots of deletes? or do you have lots of replicas? try running a metadata cleanup and see if it compacts the sync knowledge.