Tony, Have you considered the fact that a Database restart in-between two snapshots would upset this, as the V$FILESTATS would be reset? -- John Kanagaraj <>< DB Soft Inc http://www.linkedin.com/in/johnkanagaraj http://jkanagaraj.wordpress.com (Sorry - not an Oracle blog!) ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** On 9/19/07, Tony Adolph <tony.adolph.dba@xxxxxxxxx> wrote: > > Hi all, >