which type of record is best to use in appian? and in which scenario we should use entity backed record, process backed record and service backed record?
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All three are really different.
There is no best or worst. It all depends on the use-case. But most of the times, you will find yourself using the entity backed record.
thanks for answering ,but is there any different among this 3 based on performance.
I think there shouldn't be any performance difference as long as you are using Record Sync
Your choice should have nothing to do with performance, but where the data comes from. Does it come from a table, or a webservice you call, or from a process or group of processes Appian is running?