Hi Deepak, Just wondering... How about "List Partitioning" if you know each of the 'distinct' values before hand? Regards, Shiva On Mon, 2005-10-10 at 15:45, DBA Deepak wrote: > Hi All, > > In my DWH DB I have a table with few million rows. I have a column in > the table having 15 distinct values. That column is being used in the > where clause of the queries. What I am interested to know is would it > be beneficial to create a bitmap index on it. > > Is there any specific ratio (distincy values)/(Num of rows) at which > one must consider creating bitmap indexes rather than b-tree indexes? > > > > -- > Regards, > > Deepak > Oracle DBA -- //www.freelists.org/webpage/oracle-l