Update Query very slow

Hi All
I have three setups on which i have to run same query which is mentioned below. The execution plan on all three setups is same for the mentioned query. Still in one of the setup the query is taking almost 8 Hrs to complete. while in rest 2 setups it takes 2 Hrs to complete. The Ram Available for the setup is Same(16 GB). I tried to increase yhe SGA size but not got the expected results. i do not have DBA support for the same. I have also analysed and changed the parameter Index_OPtimizer_cost and made sure vthat this parameter is same for all three setups.
The main problem is i can not modify the query as it is been generated during on the processes. But as mentioned earlier the query generated on all three setup is same. I also changed log_buffer_size. The query is :
UPDATE /*+ BYPASS_UJVC */ ( SELECT Main Table_name.n_exp_covered_amt_irb AS T0 , CASE WHEN COND0 = 0 THEN BP0 ELSE BP1 END AS T1 FROM Global temp table , Main Table Name WHERE Main Table Name.n_gaap_skey=Gloabl Temp table.n_gaap_skey AND Main Table Name.n_run_skey=Gloabl Temp table.n_run_skey AND Main Table Name.n_acct_skey=Gloabl Temp table.n_acct_skey AND Main Table Name.fic_mis_date=Gloabl Temp table.fic_mis_date) SET T0 = T1
Indexes are same on the All three setups also one index is present for the column name mentioned in the where clause of the query.
The oracle version used is 10.0.1.0 in first setup in second setup i am using 10.0.2.0 and in third setup it's 10.0.4.0. The query is taking time where 10.0.2.0 version is installed.
When i have looked in to the session while the query e=was executing SORT OUTPUT was taking most of the time.
Thanks in Advance. It's very critical for me to get it resolved.Any suggestions are extremely welcome.

Hi,
please check the indexes on the colums of table where sort is happening. if indexes are not there then create it or rebuilt it. also the sql tuning advisor
recommendation in dbconsole.
thanks

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This appears to be a dulpicate of a post in the Query very slow! forum.
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http://www.ddbcinc.com/askDDBC

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http://technet.microsoft.com/en-us/library/ms177500(v=sql.105).aspx
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Plan hash value: 907176690
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | UPDATE STATEMENT | | 6 | 36870 | 153 (1)| 00:00:02 |
| 1 | UPDATE | T_INTE_NE | | | | |
|* 2 | HASH JOIN RIGHT SEMI | | 6 | 36870 | 153 (1)| 00:00:02 |
| 3 | TABLE ACCESS FULL | SMALL | 6 | 234 | 9 (0)| 00:00:01 |
| 4 | VIEW | T_INTE_NE | 6 | 36636 | 143 (0)| 00:00:02 |
| 5 | VIEW | X_V_T_INTE_NE | 6 | 18636 | 143 (0)| 00:00:02 |
| 6 | UNION-ALL | | | | | |
| 7 | TABLE ACCESS FULL| SECNODE1_T_INTE_NE | 1 | 3106 | 60 (0)| 00:00:01 |
| 8 | TABLE ACCESS FULL| SECNODE2_T_INTE_NE | 1 | 3106 | 60 (0)| 00:00:01 |
| 9 | TABLE ACCESS FULL| SECNODE3_T_INTE_NE | 1 | 3106 | 2 (0)| 00:00:01 |
| 10 | TABLE ACCESS FULL| SECNODE4_T_INTE_NE | 1 | 3106 | 2 (0)| 00:00:01 |
| 11 | TABLE ACCESS FULL| SECNODE5_T_INTE_NE | 1 | 3106 | 2 (0)| 00:00:01 |
| 12 | TABLE ACCESS FULL| SYS_T_INTE_NE | 1 | 3106 | 17 (0)| 00:00:01 |
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Note
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0 physical write total bytes
0 spare statistic 3
0 commit cleanout failures: cannot pin
0 TBS Extension: bytes extended
0 total number of times SMON posted
0 SMON posted for undo segment recovery
0 SMON posted for dropping temp segment
0 segment prealloc tasks
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Regards,
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Sorry for this, I lost myself in conjonctures and I didn't think I would have to explain the whole case.
So, I wrote a small piece of PL/SQL that reproduces the same issue.
It seems that my issue is not due to the UPDATE but to the use of the IN predicate.
As you can see at the end of the script, I try to join the 2 tables using different technics.
The first query is very fast, the second is very slow.
I need the second one if I want to do any update.
DROP TABLE Part1;
DROP TABLE Part2;
DROP TABLE Part3;
DROP TABLE Part4;
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CREATE OR REPLACE FUNCTION Decrypt
x_in IN VARCHAR2
) RETURN VARCHAR2
AS
x_out VARCHAR2(2000);
BEGIN
SELECT REVERSE( x_in ) INTO x_out FROM DUAL;
RETURN ( x_out );
END;
CREATE OR REPLACE VIEW AllParts AS
SELECT Key1, Key2, Key3, PartId, Data1, Decrypt( X_Data2 ) AS Data2, Decrypt( X_Data3 ) AS Data3 FROM Part1
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SELECT Key1, Key2, Key3, PartId, Data1, Decrypt( X_Data2 ) AS Data2, Decrypt( X_Data3 ) AS Data3 FROM Part2
UNION ALL
SELECT Key1, Key2, Key3, PartId, Data1, Decrypt( X_Data2 ) AS Data2, Decrypt( X_Data3 ) AS Data3 FROM Part3
UNION ALL
SELECT Key1, Key2, Key3, PartId, Data1, Decrypt( X_Data2 ) AS Data2, Decrypt( X_Data3 ) AS Data3 FROM Part4;
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CREATE TABLE Small ( Key1 NUMBER(10, 0), Key2 NUMBER(10, 0), Key3 NUMBER(10, 0), Data1 VARCHAR2(1000) );
BEGIN
DECLARE
n_Key NUMBER(10, 0 ) := 0;
BEGIN
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LOOP
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INSERT INTO Part2( Key1, Key2, Key3 )
VALUES( n_Key, FLOOR( n_Key / 10 ), FLOOR( n_Key / 100 ) );
INSERT INTO Part3( Key1, Key2, Key3 )
VALUES( n_Key, FLOOR( n_Key / 10 ), FLOOR( n_Key / 100 ) );
INSERT INTO Part4( Key1, Key2, Key3 )
VALUES( n_Key, FLOOR( n_Key / 10 ), FLOOR( n_Key / 100 ) );
n_Key := n_Key + 1;
END LOOP;
INSERT INTO Small( Key1, Key2, Key3, Data1 ) VALUES ( 1000, 100, 10, 'Test 1000' );
INSERT INTO Small( Key1, Key2, Key3, Data1 ) VALUES ( 3000, 300, 30, 'Test 3000' );
INSERT INTO Small( Key1, Key2, Key3, Data1 ) VALUES ( 5000, 500, 50, 'Test 5000' );
COMMIT;
END;
END;
SELECT T2.*
FROM Small T1, AllParts T2
WHERE T2.Key1 = T1.Key1 AND T2.Key2 = T1.Key2 AND T2.Key3 = T1.Key3;
SELECT T1.*
FROM AllParts T1
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Rob.

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Common.Com_Departments.Dept_Name, Common.Com_Non_Employees.Religion_ID,
Common.Com_Religions.Religion_Name, NULL as Premises_ID,
NULL as Premises_name, NULL as Categ_ID, NULL as Categ_Name,
Common.Com_Non_Employees.Desig_ID, Common.Com_Non_Employees.Desig_Suffix,
Employee.Emp_Designations.Designation, NULL as PAY_SCALE,
NULL as BASIC_SAL, NULL as HEAD_OF_DEPT, NULL as Birth_Date,
Common.Com_Non_Employees.Emp_Gender, NULL as Emp_Status,
NULL as Hire_Date,NULL as Conf_Date,NULL as Left_Date,NULL as Emp_Photo,
Employee.Emp_Emp_Info.E_Mail,Null as Dept_Head_ID
FROM Common.Com_Non_Employees, Common.Com_Branches,
Common.Com_Companies,
Common.Com_Departments, Common.Com_Religions, Common.Com_Premises,
Employee.Emp_categories, Employee.Emp_Designations, Employee.Emp_Emp_Info, COMMON.COM_REGIONS,
common.com_chapters
Where (Common.Com_Non_Employees.Branch_ID = Common.Com_Branches.Branch_ID(+))
and (Common.Com_Non_Employees.Company_ID = Common.Com_Companies.Company_ID(+))
AND (COM_BRANCHES.REGION_ID = COM_REGIONS.REGION_ID(+))
AND (COM_BRANCHES.CHAPTER_ID = COM_CHAPTERS.CHAPTER_ID(+))
and (Common.Com_Non_Employees.Department_ID = Common.Com_Departments.Department_ID(+))
and (Common.Com_Non_Employees.Religion_ID = Common.Com_Religions.Religion_ID(+))
and (Common.Com_Non_Employees.Desig_ID = Employee.Emp_Designations.Desig_ID(+))
and (Common.Com_Non_Employees.NOn_Employee_ID = Employee.Emp_Emp_Info.Employee_ID(+))
without UNION the two selet commands retrieve data in a quick manner.
Plis help!
Imran Baig

use UNION ALL instead of UNION.
If you still feel slow then generate the trace and see what is the bottle neck.
alter session set events '10046 trace name context forever, level 8'
select * from veww;
alter session set events '10046 trace name context off';
use tkprof to format the trace file generated by the event, you can find trace in your udump directory. And see what are the waiting events.
Jaffar
OCP DBA

Update Query very slow

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