-- 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:   demo4_ora600.sql
--
-- Purpose:     Advanced Oracle Troubleshooting Seminar demo script
--              Causes optimizer to loop in CBO code for very long time
--              OR an ORA-600 crash on Oracle 12.1.0.2 (fixed in 12.2)
--
-- Author:      Tanel Poder ( http://www.tanelpoder.com )
-- Copyright:   (c) Tanel Poder
--
--------------------------------------------------------------------------------

prompt Starting demo4...

drop table t;

-- use this (table with a number of rows) for ORA-600 testing on 12.1.0.2
create table t as select * from all_objects;

exec dbms_stats.gather_table_stats(user,'T');
alter session set "_optimizer_search_limit"=100;

select * 
from 
 t t1
,t t2
,t t3
,t t4
,t t5
,t t6
,t t7
,t t8
,t t9
,t t10
,t t11
,t t12
,t t13
,t t14
,t t15
,t t16
,t t17
,t t18
,t t19
,t t20
,t t21
,t t22
,t t23
,t t24
,t t25
,t t26
,t t27
,t t28
,t t29
,t t30
,t t31
,t t32
,t t33
,t t34
,t t35
,t t36
,t t37
,t t38
,t t39
,t t40
,t t41
,t t42
,t t43
,t t44
,t t45
,t t46
,t t47
,t t48
,t t49
,t t50
,t t51
,t t52
,t t53
,t t54
,t t55
,t t56
,t t57
,t t58
,t t59
,t t60
,t t61
,t t62
,t t63
,t t64
,t t65
,t t66
,t t67
,t t68
,t t69
,t t70
,t t71
,t t72
,t t73
,t t74
,t t75
,t t76
,t t77
,t t78
,t t79
,t t80
,t t81
,t t82
,t t83
,t t84
,t t85
,t t86
,t t87
,t t88
,t t89
,t t90
,t t91
,t t92
,t t93
,t t94
,t t95
,t t96
,t t97
,t t98
,t t99
/

set termout on feedback on

