Updating a table which has 1291444946 records

Hi Friends,
We have table with 1291444946 records in that 13844852 records are updated.The Current process Time taken is 12:22:55.19.This is simple update statement
update table_name set a=b where a=c;Top wait event was db file scattered read.
DB_Version=11.2.0.2
OS=Solaris 10 x86
SGA=16GB
PGA=6GB
Cursor_sharing=EXACTIs their anyway we can reduce this time to 6 hours or less.
Regards
NM

Hi,
Thanks for your reply.
TABLE_NAME,COLUMN_NAME,COUNT(*)
TIBEX_ORDER,HALTREASON,2
TIBEX_ORDER,BOOKTIMESTAMP,4
TIBEX_ORDER,STOPPRICE,2
TIBEX_ORDER,ORDERSIDE,4
TIBEX_ORDER,LASTEXECSETTLEMENTCYCLE,3
TIBEX_ORDER,PRICELEVELPOSITION,4
TIBEX_ORDER,PARTICIPANTIDMM,2
TIBEX_ORDER,LASTEXECUTIONROLE,4
TIBEX_ORDER,REFERENCEID,4
TIBEX_ORDER,LASTEXECQTY,4
TIBEX_ORDER,LASTEXECUTIONCOUNTERPARTY,4
TIBEX_ORDER,CLEARINGHANDLING,2
*TIBEX_ORDER,INSTRUMENTID,412*
TIBEX_ORDER,PRICE,257
TIBEX_ORDER,PARTICIPANTID,14
TIBEX_ORDER,MEID,6
TIBEX_ORDER,MDENTRYID,4
TIBEX_ORDER,QUANTITY,4
TIBEX_ORDER,DISCLOSEDQTY,4
TIBEX_ORDER,LASTINSTRESULT,4
TIBEX_ORDER,LASTINSTMESSAGESEQUENCE,4
TIBEX_ORDER,NOTE,4
TIBEX_ORDER,PARTNEREXID,4
TIBEX_ORDER,ORDERSTATUS,12
TIBEX_ORDER,TIMESTAMP,510
TIBEX_ORDER,ISPEX,4
TIBEX_ORDER,USERORDERID,4
TIBEX_ORDER,QTYFILLED,4
TIBEX_ORDER,LASTEXECACCOUNTNO,4
TIBEX_ORDER,ENTEREDPRICETYPE,3
TIBEX_ORDER,TIMEINFORCE,11
TIBEX_ORDER,ACCOUNTTYPE,4
TIBEX_ORDER,LASTINSTTYPE,11
TIBEX_ORDER,EXPIRYTIMESTAMP,51
TIBEX_ORDER,PEGOFFSET,4
TIBEX_ORDER,REMAINQTY,4
TIBEX_ORDER,LASTEXECPRICE,4
TIBEX_ORDER,MESSAGESEQUENCE,4
TIBEX_ORDER,PREVREFERENCEID,4
TIBEX_ORDER,PRICETYPE,2
TIBEX_ORDER,ACCOUNTNO,4
TIBEX_ORDER,MARKETSTATE,5
TIBEX_ORDER,LASTEXECPOSTTRADEVENUETYPE,4
TIBEX_ORDER,ORDERID,4
TIBEX_ORDER,LASTEXECCLEARINGAGENCY,4
TIBEX_ORDER,ORDERTYPE,6
TIBEX_ORDER,BOARDID,15
TIBEX_ORDER,CLEARINGAGENCY,6
TIBEX_ORDER,LASTINSTUSERALIAS,21
TIBEX_ORDER,LASTINSTREJECTCODE,5
TIBEX_ORDER,AVERAGEPRICE,4
TIBEX_ORDER,LASTEXECUTIONID,4
TIBEX_ORDER,VISIBLEQTY,4
TIBEX_ORDER,LASTEXECCPCLEARINGAGENCY,4Regards
NM

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