Query runs slower when using variables & faster when using hard coded value

Question

Hi,
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.

Answer 1

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,
          g.country_code,d.customer_name, d.customer_number,t.contrno bcn,
          nvl(r.dest_level3,'Undefined'),
          Decode(p.Product_code,'820','821','821','821','801') Product_Code ,
          Decode(p.Product_code,'820','Colt Voice Connect','821','Colt Voice Connect','Colt Voice Line') DProduct,
          sum(f.duration),
          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
          p.product_code in ('800','801','802','804','820','821')
          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);
          Exe_Pos:= 9;
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.