index selectivity when histograms presents on the column

  • From: "The Human Fly" <sjaffarhussain@xxxxxxxxx>
  • To: oracle-l <oracle-l@xxxxxxxxxxxxx>
  • Date: Tue, 21 Mar 2006 18:57:54 +0300


Can anyone tell me the index selectivity formula for a column when
there  are histograms on the column.
I know that the index selectivity without histograms is =
num_distinct/num_rows and also know that table selectivity uses
density to calculate the selectivty when there are histograms placed
on the column.

Best Regards,
Syed Jaffar Hussain
8i,9i & 10g, OCP DBA
Banque Saudi Fransi,
Saudi Arabia
"Winners don't do different things. They do things differently."

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