Plan inappropriate
Hi all
I was going to just through the join method documentation 11 g and it was good until I had to play with plenty of outer joins and when I run a simple query in 10 g I get a different plan
I simply ran the following query
<>format
Select
/*+
gather_plan_statistics
*/
e.first_name | ' ' || Select full_name
d.department_name
Of
e employees
full outer join
departments d
on
e.department_id = d.department_id
;
Select * from table (dbms_xplan.display_cursor (null, null, 'allstats')) last;
< / size >
and the release of 10g, I got is as follows
<>format
--------------------------------------------------------------------------------------------------------------
| ID | Operation | Name | Begins | E - lines. A - lines. A - time | Pads |
--------------------------------------------------------------------------------------------------------------
| 1. VIEW | | 1. 124. 123 | 00:00:00.01 | 262.
| 2. UNION-ALL | | 1. | 123 | 00:00:00.01 | 262.
| 3. NESTED EXTERNAL LOOPS | | 1. 107. 107. 00:00:00.01 | 227.
| 4. TABLE ACCESS FULL | EMPLOYEES | 1. 107. 107. 00:00:00.01 | 15.
| 5. TABLE ACCESS BY INDEX ROWID | DEPARTMENTS | 107. 1. 106. 00:00:00.01 | 212.
|* 6 | INDEX UNIQUE SCAN | DEPT_ID_PK | 107. 1. 106. 00:00:00.01 | 106.
| 7. ANTI NESTED LOOPS. | 1. 17. 16. 00:00:00.01 | 35.
| 8. TABLE ACCESS FULL | DEPARTMENTS | 1. 27. 27. 00:00:00.01 | 8.
|* 9 | INDEX RANGE SCAN | EMP_DEPARTMENT_IX | 27. 41. 11. 00:00:00.01 | 27.
--------------------------------------------------------------------------------------------------------------
Information of predicates (identified by the operation identity card):
---------------------------------------------------
6 - access("E".") DEPARTMENT_ID "=" D ". ("" DEPARTMENT_ID ")
9 - access("E".") DEPARTMENT_ID "=" D ". ("" DEPARTMENT_ID ")
< / size >
I was expecting what was in the documentation, but it is very very different and then I tried the same performance in 12 c in I had the plan that is mentioned in the documentation
<>format
-------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
-------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 6 (100) | |
| 1. VIEW | VW_FOJ_0 | 118. 5074 | 6 (0). 00:00:01 |
|* 2 | EXTERNAL FULL HASH JOIN | | 118. 8142 | 6 (0). 00:00:01 |
| 3. TABLE ACCESS FULL | DEPARTMENTS | 27. 810. 3 (0) | 00:00:01 |
| 4. TABLE ACCESS FULL | EMPLOYEES | 98. 3822 | 3 (0) | 00:00:01 |
-------------------------------------------------------------------------------------
Information of predicates (identified by the operation identity card):
---------------------------------------------------
2 - access("E".") DEPARTMENT_ID "=" D ". ("" DEPARTMENT_ID ")
< / size >
Can someone explain what could be wrong with my 10g instance.
10g is on Linux 64 bit and I connect to sqlplus from windows XP and on that I did not collect his stats now I think they are in place but they are not mentioned in the implementation plan
12 c is on windows 7 64 and I connect from the same machine, here I create cool tables and not seen any stats and it says in the statistical dynamic execution plan used
Kind regards
Jagdeep Seven
You can confirm with the query below.
Run as user SYS
If no back lines, I think that this parameter may used above 10.2.0.4.
Select the name of ksppinm,
value of ksppstvl
ksppstdf is_default,
Decode (BITAND(ksppiflg/256,1), 1, "true", "false") ses_modifiable,.
Decode (bitand(ksppiflg/65536,3), 1)
'immediate', 2,
"deferred", 3,
sys_modifiable "immediate", "false"),
ksppdesc description
of sys.x$ ksppi i, sys.x$ ksppcv v
where i.indx = v.indx
and i.ksppinm like '% _optimizer_native_full_outer_join % ';
NAME | VALUE | IS_DEFAULT | SES_MODIFIABLE | SYS_MODIFIABLE | DESCRIPTION |
_optimizer_native_full_outer_join | FORCE | TRUE | true | immediate | running a full outer join by using the native implementation |
Cordially Bono
Tags: Database
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