Bump. Same question please.
This table stores all string from Flow storage database, like domains, hostnames etc. When the table is dropped, only newly received strings will be visible in Netflow.
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.