TABLE 1 Data That the fn_virtualfilestats() Function Reports
Column Name	Data Type	Description
DbId	smallint	Database ID
FileId	smallint	File ID
TimeStamp	int	Time at which the data was taken
NumberReads	bigint	Number of reads issued on the file
NumberWrites	bigint	Number of writes made on the file
BytesRead	bigint	Number of bytes read issued on the file
BytesWritten	bigint	Number of bytes written made on the file
IoStallMS	bigint	Total amount of time, in milliseconds, that users waited for the I/Os to complete on the file