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Updated June 30, 2016
This article explains larger NetFlowFastBitStringHeap and NetFlowEndpoints Netflow tables.
NTA 4.0 and later
It is quite common for this table to be quite large. The table contains mapping between the endpoints in the Flow Storage Database and the IP address / hostname that is stored in the SQL database.
Event though all the Flow data is stored in the Flow Storage database, the SQL database is still used for data such as applications, protocols, endpoint ID to hostname mapping, and so on.
If you have a lot of endpoints this table can get quite large.