Beginning selection of qualifying indexes for table 'TAB1', 
varno = 0, objectid 144000513. 
   The table (Datapages) has 9990 rows, 159 pages, 
   Data Page Cluster Ratio 0.992806 


Table scan cost is 9990 rows, 161 pages, 
   using no data prefetch (size 2K I/O), 
   in data cache 'default data cache' (cacheid 0) with LRU replacement 




Selecting best index for the SEARCH CLAUSE: 
	TAB1.ID = 500 




Estimated selectivity for ID, 
   selectivity = 0.001001, upper limit = 0.053053. 




The best qualifying access is a table scan, 
   costing 161 pages, 
   with an estimate of 10 rows to be returned per scan of the table, 
   using no data prefetch (size 2K I/O), 
   in data cache 'default data cache' (cacheid 0) with LRU replacement 
Search argument selectivity is 0.001001.