Query not performing well

Hi,
We are trying to load data from R/3 46c to BW31. This load takes no more than 2 hours max generally. At times we have noticed that it takes exceptionally more time like 10-12 hours . .
On checking I found that it generally gets stuck like in COVP . .though it keeps on reading thru this . . but is takes lot of time . program which it uses is SAPLBWOMR
and the query is given below. How to tackle this . .we tried identifying where there is some contention because of which this is happening . but no luck . .All the indexes for the tables behing this view are standard ones . .
SELECT
"BEKNZ" , "BELNR" , "BELTP" , "BLDAT" , "BUDAT" , "BUKRS" , "BUZEI" ,
"FKBER" , "GJAHR" , "GKOAR" , "GKONT" , "GSBER" , "KOKRS" , "KSTAR" ,
"KWAER" , "MATNR" , "MEFBTR" , "MEGBTR" , "MEINH" , "OBJNR" , "OBJNR_N1" ,
"OWAER" , "PAROB1" , "PBUKRS" , "PERIO" , "PERNR" , "PFKBER" , "QMNUM" ,
"SGTXT" , "TWAER" , "VERSN" , "VRGNG" , "WERKS" , "WKFBTR" , "WKGBTR" ,
"WOGBTR" , "WRTTP" , "WTGBTR"
FROM
"COVP"
WHERE
"LEDNR" = :A0 AND "OBJNR" BETWEEN :A1 AND :A2 AND "WRTTP" IN ( :A3 , :A4 ,
:A5 ) AND "TIMESTMP" BETWEEN :A6 AND :A7 AND "MANDT" = :A8#

Hi Vijay
Contact with your basis team and try to find out the stastics of the table which your using ..
1)Ask them to run Compute build stastics on this table
2) Check the distinct values for the columns.
your basis team will be having the idea about the above mentioned things ..check with them..
bye
Shu Moh.

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