Query is slow in instance1 and fast in instance2 of RAC

Hi,
I have a query which runs in 20 minutes in node1 of RAC and the same query run for 10 seconds in node2 of RAC.Node1 is a processing instance which may have more IO but this much elapsed time difference seems to be very odd.Query using same plan in both instances
Can you please explain me what all possibilities for a query to behave differently in 2 instances of RAC?
Thanks very much for your help!
Thanks

This is definitely wierd! Will it be possible for you to provide the Explain Plan information from both the nodes...hopeful it will help with some pointers/insights.
Thanks
Chandra

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My query runs slower when i use variables but it runs faster when i use hard coded values. Why it is behaving like this ?
My query is in cursor definition in a procedure. Procedure runs faster when using hard coded valus and slower when using variables.
Can anybody help me out there?
Thanks in advance.

Hi,
Thanks for ur reply.
here is my code with Variables:
Procedure populateCountryTrafficDetails(pWeekStartDate IN Date , pCountry IN d_geography.country_code%TYPE) is
startdate date;
AR_OrgId number(10);
Cursor cTraffic is
Select
          l.actual_date, nvl(o.city||o.zipcode,'Undefined') Site,
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          sum(f.debamount_eur)
          from d_calendar_date l,
          d_geography g,
          d_customer d, d_contract t, d_subscriber s,
          d_retail_dest r, d_product p,
          CPS_ORDER_DETAILS o,
          f_retail_revenue f
          where
          l.date_key = f.call_date_key and
          g.geography_key = f.geography_key and
          r.dest_key = f.dest_key and
          p.product_key = f.product_key and
          --c.customer_key = f.customer_key and
          d.customer_key = f.customer_key and
          t.contract_key = f.contract_key and
          s.SUBSCRIBER_KEY = f.SUBSCRIBER_KEY and
          o.org_id(+) = AR_OrgId and
          g.country_code = pCountry and
          l.actual_date >= startdate and
          l.actual_date <= (startdate + 90) and
          o.cli(+) = s.area_subno and
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          group by
          l.actual_date,
          o.city||o.zipcode, g.country_code,d.customer_name, d.customer_number,t.contrno,r.dest_level3, p.product_code;
Type CountryTabType is Table of country_traffic_details.Country%Type index by BINARY_INTEGER;
Type CallDateTabType is Table of country_traffic_details.CALL_DATE%Type index by BINARY_INTEGER;
Type CustomerNameTabType is Table of Country_traffic_details.Customer_name%Type index by BINARY_INTEGER;
Type CustomerNumberTabType is Table of Country_traffic_details.Customer_number%Type index by BINARY_INTEGER;
Type BcnTabType is Table of Country_traffic_details.Bcn%Type index by BINARY_INTEGER;
Type DestinationTypeTabType is Table of Country_traffic_details.DESTINATION_TYPE%Type index by BINARY_INTEGER;
Type ProductCodeTabType is Table of Country_traffic_details.Product_Code%Type index by BINARY_INTEGER;
Type ProductTabType is Table of Country_traffic_details.Product%Type index by BINARY_INTEGER;
Type DurationTabType is Table of Country_traffic_details.Duration%Type index by BINARY_INTEGER;
Type DebamounteurTabType is Table of Country_traffic_details.DEBAMOUNTEUR%Type index by BINARY_INTEGER;
Type SiteTabType is Table of Country_traffic_details.Site%Type index by BINARY_INTEGER;
CountryArr CountryTabType;
CallDateArr CallDateTabType;
Customer_NameArr CustomerNameTabType;
CustomerNumberArr CustomerNumberTabType;
BCNArr BCNTabType;
DESTINATION_TYPEArr DESTINATIONTYPETabType;
PRODUCT_CODEArr PRODUCTCODETabType;
PRODUCTArr PRODUCTTabType;
DurationArr DurationTabType;
DebamounteurArr DebamounteurTabType;
SiteArr SiteTabType;
Begin
     startdate := (trunc(pWeekStartDate) + 6) - 90;
     Exe_Pos := 1;
     Execute Immediate 'Truncate table country_traffic_details';
     dropIndexes('country_traffic_details');
     Exe_Pos := 2;
     /* Set org ID's as per AR */
     case (pCountry)
     when 'FR' then AR_OrgId := 81;
     when 'AT' then AR_OrgId := 125;
     when 'CH' then AR_OrgId := 126;
     when 'DE' then AR_OrgId := 127;
     when 'ES' then AR_OrgId := 123;
     when 'IT' then AR_OrgId := 122;
     when 'PT' then AR_OrgId := 124;
     when 'BE' then AR_OrgId := 132;
     when 'IE' then AR_OrgId := 128;
     when 'DK' then AR_OrgId := 133;
     when 'NL' then AR_OrgId := 129;
     when 'SE' then AR_OrgId := 130;
     when 'UK' then AR_OrgId := 131;
     else raise_application_error (-20003, 'No such Country Code Exists.');
     end case;
     Exe_Pos := 3;
dbms_output.put_line('3: '||to_char(sysdate, 'HH24:MI:SS'));
     populateOrderDetails(AR_OrgId);
dbms_output.put_line('4: '||to_char(sysdate, 'HH24:MI:SS'));
     Exe_Pos := 4;
     Open cTraffic;
     Loop
     Exe_Pos := 5;
     CallDateArr.delete;
FETCH cTraffic BULK COLLECT
          INTO CallDateArr, SiteArr, CountryArr, Customer_NameArr,CustomerNumberArr,
          BCNArr,DESTINATION_TYPEArr,PRODUCT_CODEArr, PRODUCTArr, DurationArr, DebamounteurArr LIMIT arraySize;
          EXIT WHEN CallDateArr.first IS NULL;
               Exe_pos := 6;
                    FORALL i IN 1..callDateArr.last
                    insert into country_traffic_details
                    values(CallDateArr(i), CountryArr(i), Customer_NameArr(i),CustomerNumberArr(i),
                    BCNArr(i),DESTINATION_TYPEArr(i),PRODUCT_CODEArr(i), PRODUCTArr(i), DurationArr(i),
                    DebamounteurArr(i), SiteArr(i));
                    Exe_pos := 7;
dbms_output.put_line('7: '||to_char(sysdate, 'HH24:MI:SS'));
     EXIT WHEN ctraffic%NOTFOUND;
END LOOP;
     commit;
Exe_Pos := 8;
          commit;
dbms_output.put_line('8: '||to_char(sysdate, 'HH24:MI:SS'));
          lSql := 'CREATE INDEX COUNTRY_TRAFFIC_DETAILS_CUSTNO ON country_traffic_details (CUSTOMER_NUMBER)';
          execDDl(lSql);
          lSql := 'CREATE INDEX COUNTRY_TRAFFIC_DETAILS_BCN ON country_traffic_details (BCN)';
          execDDl(lSql);
          lSql := 'CREATE INDEX COUNTRY_TRAFFIC_DETAILS_PRODCD ON country_traffic_details (PRODUCT_CODE)';
          execDDl(lSql);
          lSql := 'CREATE INDEX COUNTRY_TRAFFIC_DETAILS_SITE ON country_traffic_details (SITE)';
          execDDl(lSql);
          lSql := 'CREATE INDEX COUNTRY_TRAFFIC_DETAILS_DESTYP ON country_traffic_details (DESTINATION_TYPE)';
          execDDl(lSql);
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dbms_output.put_line('9: '||to_char(sysdate, 'HH24:MI:SS'));
Exception
     When Others then
     raise_application_error(-20003, 'Error in populateCountryTrafficDetails at Position: '||Exe_Pos||' The Error is '||SQLERRM);
End populateCountryTrafficDetails;
In the above procedure if i substitute the values with hard coded values i.e. AR_orgid = 123 & pcountry = 'Austria' then it runs faster.
Please let me know why it is so ?
Thanks in advance.

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