V$DB_CACHE_ADVICE

 Hi All, 

I have what may be a pretty daft question about the v$db_cache_advice view. I've done some searching, but for some reason i can't find an answer to this.

In the v$db_cache_advice view one of the columns is

ESTD_PHYSICAL_READS 

NUMBER 

Estimated number of physical reads for this cache size 

What i was wondering is what unit of time is this number of physical reads predicted to occur in. Is it per second, per minute, per awr snap interval, per hour, between cups of coffee :-)?

Cheers

Chris