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2026-03-12 21:23:47 +01:00
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tpt/ast/04_cbo_troubleshoot_setup.sql Normal file
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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.
INSERT INTO oe.promotions
SELECT 10+rownum promo_id, 'promotion '||to_char(10+rownum)
FROM dual CONNECT BY level < 90
/
INSERT INTO oe.promotions VALUES (100, 'online super-sale');
exec dbms_stats.gather_schema_stats('OE');
exec dbms_stats.create_stat_table('OE', 'STATS_BACKUP');
exec dbms_stats.export_schema_stats('OE', 'STATS_BACKUP', 'AST_04_TROUBLE_01');
CREATE TABLE oe.tmp AS SELECT * FROM oe.orders WHERE 1=0;
INSERT /*+ APPEND */ INTO oe.tmp
SELECT
oe.orders_seq.NEXTVAL
, sysdate -- order date
, 'online' -- order mode
, 189 -- customer id
, 12 -- order status
, 99.95 -- order_total
, 171 -- sales rep
, 100 -- promotion_id
, null -- warehouse_id -- added new column
FROM
dual CONNECT BY level <= 100000
/
COMMIT;
INSERT INTO oe.orders (
order_id NOT NULL NUMBER(12)
, order_date NOT NULL TIMESTAMP(6) WITH LOCAL TIME ZONE
, order_mode VARCHAR2(8)
, customer_id NOT NULL NUMBER(6)
, order_status NUMBER(2)
, order_total NUMBER(8,2)
, sales_rep_id NUMBER(6)
, promotion_id
, warehouse_id -- added a new column
)
SELECT * FROM oe.tmp
ORDER BY
dbms_random.random -- to increase pk clustering factor
/
COMMIT;
BEGIN
FOR i IN (SELECT order_id FROM oe.tmp) LOOP
-- such a lousy loop is needed as there's a "single row" trigger on order_items tab
INSERT INTO oe.order_items (ORDER_ID,PRODUCT_ID,UNIT_PRICE,QUANTITY)
VALUES ( i.order_id, 3337, 9.95, power(2,power(2,dbms_random.value(1,3))) );
-- commit in a loop so i wouldnt blow up my little undo tablespace
COMMIT;
END LOOP;
END;
/
-- save old "bad" stats
exec dbms_stats.export_schema_stats('OE', 'STATS_BACKUP', 'AST_04_TROUBLE_BEGIN');
-- to restore:
-- exec dbms_stats.import_schema_stats('OE', 'STATS_BACKUP', 'AST_04_TROUBLE_BEGIN', NO_INVALIDATE=>FALSE);
-- run the 04_cbo_troubleshoot_1.sql and troubleshoot! :)