2026-03-12 20:23:15

mhouri/CurSelCubeHybridNonPop.sql

@@ -0,0 +1,86 @@
+--************************************************************************
+-- Name   : CurSelCubeHybridNonPop
+-- Date   : October 2017
+-- Author : Mohamed Houri
+-- Purpose: gives the selectivity low and high value range of a Hybrid 
+--          non-popular histogram bind variable having an endpoint number
+--          when this bind variable is used in a bind aware cursor
+--***********************************************************************
+var num_rows    number
+var new_density number
+
+begin
+ select num_rows into :num_rows from all_tables where table_name = upper ('&table_name');
+end;
+/
+
+begin
+     SELECT
+        trunc(((BktCnt-PopBktCnt)/BktCnt)/(NDV-PopValCnt),10) 
+		into :new_density
+     FROM
+        (SELECT
+           COUNT(1) PopValCnt,
+           SUM(endpoint_repeat_count) PopBktCnt,
+           ndv,
+           BktCnt,
+           pop_bucketSize
+         FROM
+          (SELECT
+            (sample_size - num_nulls) BktCnt,
+            num_distinct ndv,
+            num_buckets,
+            density OldDensity,
+            (sample_size-num_nulls)/num_buckets pop_bucketSize
+          FROM user_tab_col_statistics
+          WHERE
+              table_name  = upper ('&table_name')
+          AND column_name = upper ('&column_name')
+          ),
+          user_histograms
+        WHERE table_name         = upper ('&table_name')
+        AND column_name          = upper ('&column_name')
+        AND endpoint_repeat_count> pop_bucketSize
+        GROUP BY ndv,
+          BktCnt,
+          pop_bucketSize
+        );
+end;
+/
+
+col bind format a10
+select
+    bind
+   ,round((sel_of_bind - offset),6) low
+   ,round((sel_of_bind + offset),6) high
+from
+   (select
+      bind
+     ,value_count/:num_rows       sel_of_bind
+	 ,0.1*(value_count/:num_rows) offset
+    from
+     (select 
+	      endpoint_actual_value bind
+	    ,(:num_rows*greatest(:new_density,endpoint_repeat_count/sample_size)) value_count
+	  from
+	     (select
+           sample_size
+		  ,endpoint_actual_value 
+          ,endpoint_repeat_count
+         from (select
+				 ucs.sample_size 
+				,uth.endpoint_actual_value
+				,uth.endpoint_repeat_count
+			   from
+				user_tab_histograms uth
+			   ,user_tab_col_statistics ucs
+		      where
+				uth.table_name   = ucs.table_name
+			  and uth.column_name   = ucs.column_name
+			  and uth.table_name    = upper ('&table_name')
+			  and uth.column_name   = upper ('&column_name')
+			   )
+	       )
+	  )
+	)
+where bind = &bind;