I have used Jonathan's index efficiency script to plot the graph.The graph is attached with this mail. This index is a single column index ( it's like a status column which has only 4 values say 1 - completed,2- declined,3-suspended,4-unknown).This table is populated every day and this column's values other than 1 and 2 are updated with a new status based on daily's data. By looking at the graph,what do you infer? How effiecient the index is? Thanks -- //www.freelists.org/webpage/oracle-l