Enables or disables a data flush following export of the
accounting data file. If enabled, the Accounting Service
will clear all data both internally and in the MIB after
the data file is tranported and start over at the next
activation of wfAcctUpdateInterval. If disabled, the
snapshots of accounting data will remain in memory until
either the wfAcctFlushData attribute is set or until the
maximum number of snapshots has been reached, at which
point the collection of snapshots will function as
described by the wfAcctCircularSnapshotFlag.