Collecting stats on unused column - response (3) by samurai07

Hi,
Collecting stats on unused columns is not advisable. In the above case, it will not impact the query performance. If you dont collect on the columns which are used in the query (usually in joins/where clause) then it will impact the performance
Collecting stats will use system resources and henceforth it is advised to collect stats on the columns which are frequently used in the query and which has high performance impact.
collecting stats on unused columns is like buying something and keeping it @home which is not used. Simply you are investing resources thats it
Hope this helps