Oracle 10g - optimize WHERE IS NOT NULL

Question

We have Oracle 10g and we need to query 1 table (no joins) and filter out rows where 1 of the columns is null. When we do this - WHERE OurColumn IS NOT NULL - we get a full

Answer 1

See http://www.oracloid.com/2006/05/using-index-for-is-null/

If your index is on one single field, it will NOT be used. Try to add a dummy field or a constant in the index:

create index tind on t(field_to_index, 1);