Need help in performance tunning

Question

Hi , i have one update statement , where it is keep on running for hours and the volume of the data is 2.2 million
version:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE 10.2.0.4.0 Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
below is the code :
DECLARE
Cursor C11
Is
Select Account_Num,Outlet_Num,Product_Number,Ln_Of_Biz,Generateguid('DELIVERED_PRODUCT') As Dp_Guid From (
Select Account_Num,Outlet_Num,Product_Number,Ln_Of_Biz
From transformation_flat
Group By Account_Num, Outlet_Num,Ln_Of_Biz,Product_Number
Having Count(*)> 1);
Type Actno Is Table Of Varchar2(13) Index By Binary_Integer;
Type Outlet Is Table Of NUMBER Index By Binary_Integer;
Type Pno Is Table Of VARCHAR2(255) INDEX BY BINARY_INTEGER;
Type Tn Is Table Of VARCHAR2(10) Index By Binary_Integer;
Type Vdpguid Is Table Of VARCHAR2(20) Index By Binary_Integer;
Type Vcnt Is Table Of Number Index By Binary_Integer;
Type Lob1 Is Table Of Varchar2(255) Index By Binary_Integer;
Type Offer_No Is Table Of Varchar2(255) Index By Binary_Integer;
V_Actno Actno;
V_Outlet Outlet;
V_Pno Pno;
V_Tn Tn;
V_DPGUID VDPGUID;
Vguid Varchar2(20);
V_Cnt Vcnt;
V_Lob Lob1;
V_Offer_No Offer_No;
BEGIN
Open c11;
Loop
Fetch C11 Bulk Collect Into V_Actno,V_Outlet,V_Pno,V_Lob,V_Dpguid;
Exit When C11%Notfound;
End Loop;
close c11;
Forall I In 1..V_Actno.count
Update transformation_flat Set Product_Guid=V_Dpguid(I) Where
Account_Num=V_Actno(I) And
Outlet_Num=V_Outlet(I) And
Product_Number=V_Pno(I) And
ln_of_biz=v_lob(I);
Commit;
END;
for above i do have index on that table on (account_num,outlet_num,product_number,ln_of_biz).
when i checked the memory contents for this sqlid in v$sql , below are the values :
Disk_Read:21640650
Buffer_Gets:22466856
Concurrency_Wait_Time:16923
Cluster_Wait_Time:36313694
user_io_wait_time:3594365433
I need some inputs in which area i can tune the above code..
Thanks

Answer 1

835589 wrote:
hi i am also face same performance issue pls reply me ASApDon't use the word ASAP, it is rude and a violation of forum terms and conditions.
http://www.oracle.com/html/terms.html
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These people are for ASAP requests.
http://www.google.com/search?q=oracle+consultant
where i need to tune the queery.
pls i am eagarly waiting for that
Read and understand the links posted above
RPuttagunta wrote:
HOW TO: Post a SQL statement tuning request - template posting
When your query takes too long ...