We want to retrieve data from a another system using a service backed record approach. While doing this we saw a 5MB size data limit restriction for the full sync. Also we are not able to provide any batchNumber so as to get full data(as we are not getting this parameter to be passed to the actual API).
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There are very strict data limits in Appian to prevent us from breaking the system. And these limit can and should not be raised.
Synced data is stored inside Appian in a separate database which is only accessible through the record. If you want to persist that data to a SQL DB, then, first sync that data to this DB and then put the Appian record on top of it.