2026-03-12 20:23:15

mhouri/CurSelCubeHybridNonPopWithoutEndPoint.sql

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+--*******************************************************************
+-- Name   : CurSelCubeHybridNonPopWithoutEndPoint
+-- Date   : October 2017
+-- Author : Mohamed Houri
+-- Purpose: gives the selectivity low and high value range of a Hybrid 
+--          non-popular histogram bind variable which has not been
+--          captured by the histogram gathering program.
+--          This low-high value range corresponds to the low-high
+--          selectivity range of a bind aware cursor using this
+--          bind variable value
+--*****************************************************************|
+var num_rows    number
+var new_density number
+
+begin
+ select num_rows into :num_rows from all_tables where table_name = 'ACS_TEST_TAB';
+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  = 'ACS_TEST_TAB'
+          AND column_name = 'RECORD_TYPE'
+          ),
+          user_histograms
+        WHERE table_name         = 'ACS_TEST_TAB'
+        AND column_name          = 'RECORD_TYPE'
+        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
+     ,:new_density       sel_of_bind
+	 ,0.1*(:new_density) offset
+    from dual
+	);
+     
+