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Maintaining the NTA Flow Storage Database requires setting an appropriate retention period that corresponds with the amount of data you need to keep and the free space available on the NTA Flow Storage Database disk.
Retention period specifies the time for which flow data are stored in the database until they expire and are permanently deleted.
To optimize the retention period for your NTA Flow Storage Database, collect data for a few days. You should then have an idea of the volume of data your network produces with NetFlow enabled. Consider also the space taken up by the database, and then adjust the retention period accordingly.