2026-03-12 20:23:15

2026-03-12 21:23:47 +01:00
parent eab4b36eca
commit 93039b8489
3332 changed files with 699614 additions and 0 deletions
--- a/tpt/experiments/histogram_linear_decay_of_selectivity.sql
+++ b/tpt/experiments/histogram_linear_decay_of_selectivity.sql
@@ -0,0 +1,67 @@
+-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
+-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
+
+DROP TABLE t;
+
+CREATE TABLE t AS SELECT * FROM dba_objects;
+
+SELECT
+     MIN(created)
+  , MAX(created)
+  , ROUND(MAX(created)-MIN(created)) range_days
+  , COUNT(*) num_rows
+  , COUNT(*) / ROUND(MAX(created)-MIN(created)) rows_per_day
+  , SUM(NVL2(created,0,1)) nulls 
+FROM 
+    t
+/
+
+EXEC DBMS_STATS.GATHER_TABLE_STATS(user, 'T', method_opt=>'FOR TABLE', no_invalidate=>FALSE);
+
+-- SELECT * FROM t WHERE created > SYSDATE - 1;
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+-- 
+-- SELECT * FROM t WHERE created > SYSDATE;
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+-- 
+-- SELECT * FROM t WHERE created > SYSDATE + 1;
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+-- 
+-- SELECT * FROM t WHERE created > SYSDATE + 10;
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+-- 
+-- SELECT * FROM t WHERE created > SYSDATE + 100;
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+
+-- SELECT * FROM t WHERE created > DATE'2012-09-01';
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+
+SELECT * FROM t WHERE created < DATE'2010-10-01';
+SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+
+
+
+EXEC DBMS_STATS.GATHER_TABLE_STATS(user, 'T', method_opt=>'FOR TABLE FOR ALL COLUMNS SIZE 254', no_invalidate=>FALSE);
+
+-- SELECT * FROM t WHERE created > SYSDATE - 1;
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+-- 
+-- SELECT * FROM t WHERE created > SYSDATE;
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+-- 
+-- SELECT * FROM t WHERE created > SYSDATE + 1;
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+-- 
+-- SELECT * FROM t WHERE created > SYSDATE + 10;
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+-- 
+-- SELECT * FROM t WHERE created > SYSDATE + 100;
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+
+-- SELECT * FROM t WHERE created > DATE'2012-09-01';
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+
+SELECT * FROM t WHERE created < DATE'2010-10-01';
+SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
+
+