2026-03-12 20:23:15

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parent eab4b36eca
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--- a/tpt/ast/02_choosing_join_order.sql
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+-- 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.
+
+--------------------------------------------------------------------------------
+--
+-- File name:   02_choosing_join_order.sql
+--
+-- Purpose:     Advanced Oracle SQL Tuning demo script
+-- Author:      Tanel Poder
+-- Copyright:   (c) http://www.tanelpoder.com
+--              
+-- Usage:       You can run the query against Oracle's sample schemas (SH)
+--              The optimizer stats have to be updated to cause trouble.
+--               See the commented out code below
+--                
+--------------------------------------------------------------------------------
+
+-- in Oracle 11gR2, set the cardinality feedback option to false for demo stability purposes
+-- alter session set "_optimizer_use_feedback"=false;
+--
+-- Set statistics_level = all for measuring optimizer misestimate (or use V$SQL_MONITOR):
+-- alter session set statistics_level = all;
+--
+-- Cause trouble for the optimizer:
+-- EXEC DBMS_STATS.SET_TABLE_STATS('SH','CUSTOMERS', NUMROWS=>1, NUMBLKS=>1, NO_INVALIDATE=>FALSE);
+
+SELECT /*+ MONITOR */
+    ch.channel_desc
+  , co.country_iso_code co 
+  , cu.cust_city
+  , p.prod_category
+  , sum(s.quantity_sold)
+  , sum(s.amount_sold)
+FROM
+    sh.sales     s
+  , sh.customers cu
+  , sh.countries co
+  , sh.products  p
+  , sh.channels  ch
+WHERE
+    -- join
+    s.cust_id     = cu.cust_id
+AND cu.country_id = co.country_id
+AND s.prod_id     = p.prod_id
+AND s.channel_id  = ch.channel_id
+    -- filter
+AND ch.channel_class = 'Direct'  
+AND co.country_iso_code = 'US'  
+AND p.prod_category = 'Electronics'
+GROUP BY
+    ch.channel_desc
+  , co.country_iso_code
+  , cu.cust_city
+  , p.prod_category
+/
+
+
+--------------------------------------------------------------------------------------------------------
+-- SQL Profiles (require Tuning + Diag Pack):
+--------------------------------------------------------------------------------------------------------
+--
+--   VAR sql_fulltext CLOB
+--   EXEC SELECT sql_fulltext INTO :sql_fulltext FROM v$sql WHERE sql_id = '1ka5g0kh4h6pc' AND rownum = 1;
+--
+-- Example 1: Set Join order:
+--   EXEC DBMS_SQLTUNE.IMPORT_SQL_PROFILE(sql_text=>:sql_fulltext, profile=>sys.sqlprof_attr('LEADING(@"SEL$1" "CO"@"SEL$1" "CH"@"SEL$1" "CU"@"SEL$1" "S"@"SEL$1" "P"@"SEL$1")'), name=> 'MANUAL_PROFILE_1ka5g0kh4h6pc');
+--
+-- Example 2: Adjust cardinality:
+--   EXEC DBMS_SQLTUNE.IMPORT_SQL_PROFILE(sql_text=>:sql_fulltext, profile=>sys.sqlprof_attr('CARDINALITY(@"SEL$1" "CU"@"SEL$1" 100000)'), name=> 'MANUAL_PROFILE_1ka5g0kh4h6pc');
+--
+-- Example 3: Set multiple hints:
+--   DECLARE
+--       hints sys.sqlprof_attr := sys.sqlprof_attr(
+--           ('LEADING(@"SEL$1" "CO"@"SEL$1" "CH"@"SEL$1"')
+--         , ('CARDINALITY(@"SEL$1" "CU"@"SEL$1" 100000)')
+--       );
+--   BEGIN
+--       DBMS_SQLTUNE.IMPORT_SQL_PROFILE(sql_text=>:sql_fulltext, profile=> hints, name=> 'MANUAL_PROFILE_1ka5g0kh4h6pc');
+--   END;
+--   /
+--
+-- Drop the profile:
+--   EXEC DBMS_SQLTUNE.DROP_SQL_PROFILE('MANUAL_PROFILE_1ka5g0kh4h6pc');
+--
+--
+--------------------------------------------------------------------------------------------------------
+-- SQL Plan Baselines - DBMS_SPM in EE licenses - see http://jonathanlewis.wordpress.com/2011/01/12/fake-baselines/
+--------------------------------------------------------------------------------------------------------
+-- bad_sqlid  = 1ka5g0kh4h6pc
+-- good_sqlid = 1fzf3vqv0f49q 
+
+-- 1) Manually run the query with hints, params, etc to get the plan you want (the good query)
+--
+-- 2) Create a disabled plan baseline for the "bad query":
+--    VAR x NUMBER
+--    EXEC :x:= DBMS_SPM.LOAD_PLANS_FROM_CURSOR_CACHE('&bad_sqlid', enabled=>'NO');
+--
+-- 3) SELECT sql_handle FROM dba_sql_plan_baselines WHERE sql_text = '<your sql_text>';
+--
+-- 4) Associate the "good query" plan with the "bad query" SQL plan baseline:
+--    DEF good_sql_id = 1fzf3vqv0f49q
+--    DEF good_plan_hash_value = 2863714589
+--    DEF sql_handle_for_original = SQL_4b3ef772af37954d
+
+--    VAR x NUMBER
+--    
+--    exec :x := dbms_spm.load_plans_from_cursor_cache( -
+--            sql_id => '&good_sql_id', -
+--            plan_hash_value => &good_plan_hash_value, -
+--            sql_handle => '&sql_handle_for_original');
+--