Verify that the keys and records match. If a record is selected based on its key value in the index, the data record will be read and the key recreated from the information in the record, to double check that the key is accurate. This prevents a record from being selected if it is in the process of being updated, and the index value has not yet been rewritten. BAT_VERIFY is required to apply an active record filter to the batch results, otherwise active filters are ignored.
The default is to have no verification.