BTW, you can rewrite "AND (gamm.PROCESS_NAME = 'SAM_Exact_Product_Search' OR gamm.APPLICATION_NAME = 'SAM_Exact_Product_Search')" as "AND 'SAM_Exact_Product_Search' IN (gamm.PROCESS_NAME, gamm.APPLICATION_NAME)"

trunc(gmz.testtime) will obviate the use of any INDEX on gmz.testtime, better to use AND gmz.testtime >= to_date('09/12/2011','MM/DD/YYYY') AND gmz.testtime < to_date('09/16/2011','MM/DD/YYYY')

IIUC, i don't think you need to specify TO_CHAR in the GROUP BY clause.

For formatting the query, so people can read it, try:

SELECT
	gamm.PROCESS_NAME,
	GAMM.APPLICATION_NAME,
	TO_CHAR(TRUNC(gmz.testtime - 7 / 24, 'DD'),'MM/DD/YYYY')
	Fiscal_Day,
	ROUND
	(
	 AVG
	 (
	  DECODE(total_response_time, 0, NULL, total_response_time)
	  / DECODE (total_page_count,0, 1,total_page_count)
	 )
	 / 1000,
	 2
	) Average_Response_time
FROM
	portal_gomez_bb_load		gmz,
	GOMEZ_APP_MAPPING_MASTER	gamm
WHERE
	gmz.monitor_id			= 3805260
  AND	'SAM_Exact_Product_Search'	IN (gamm.PROCESS_NAME, gamm.APPLICATION_NAME)
  AND	gmz.testtime			>= to_date('09/12/2011','MM/DD/YYYY')
  AND	gmz.testtime			< to_date('09/16/2011','MM/DD/YYYY')
  AND	success_flag			= 0
GROUP BY
	gamm.PROCESS_NAME,
	GAMM.APPLICATION_NAME,
	TRUNC (gmz.testtime - 7 / 24, 'DD');

Hi All, Thanks a lot for all the replies. I have tried to include the piece of SQL code by inserting into my code. But this too is not giving any results. I am using the correct Userid/pwd/schema etc. for this. Please find the piece of code I have written.

use strict;
use Tk;
use Tk::BrowseEntry;
use Tk::LabFrame;
use Tk::JPEG;
use DBI;
use DBD::Oracle;
use Spreadsheet::WriteExcel; 
.
.
.
.
.
.
.
sub generateDailyReport{
    
    #Create Excel
    my $workbook = Spreadsheet::WriteExcel->new('Report.xls');
    my $worksheet   = $workbook->add_worksheet();
    my $from_date = @_[0];
    my $to_date = @_[1];
    
    #Connect to DB
    my $dbh = DBI->connect("dbi:Oracle:cecdev9","asdm_dev","c1sc0pass"
+)
    or die "cannot connect $DBI::errstr\n";
    
       my $sth = $dbh->prepare("SELECT   gamm.PROCESS_NAME, GAMM.APPLI
+CATION_NAME, TO_CHAR (TRUNC (gmz.testtime - 7 / 24, 'DD'),'MM/DD/YYYY
+') Fiscal_Day,ROUND (AVG(DECODE (total_response_time, 0, NULL, total_
+response_time) / DECODE (total_page_count,0, 1,total_page_count))/ 10
+00,2) Average_Response_time FROM   portal_gomez_bb_load gmz, GOMEZ_AP
+P_MAPPING_MASTER gamm WHERE   gmz.monitor_id = 3805260 AND (gamm.PROC
+ESS_NAME = 'SAM_Exact_Product_Search' OR gamm.APPLICATION_NAME = 'SAM
+_Exact_Product_Search') AND trunc(gmz.testtime) BETWEEN to_date('09/1
+2/2011','MM/DD/YYYY') AND to_date('09/15/2011','MM/DD/YYYY') AND succ
+ess_flag = 0 GROUP BY   gamm.PROCESS_NAME,GAMM.APPLICATION_NAME,TO_CH
+AR (TRUNC (gmz.testtime - 7 / 24, 'DD'),'MM/DD/YYYY')");

        #execute the query
        $sth->execute();
    my $i = "A1";
    my $j = 1;
    while ( my @row = $sth->fetchrow_array( ) )  {
     print "@row\n";
      
     $worksheet->write($i, \@row);
     $j=$j+1;
     $i="A$j";
     open(FILE,'Report.xls'); 
    }

}
[download]

Please help. Thanks, Vidya Surendran

Did you read the replies you already have? I advised that you look at tracing, which you've not done in this example.

Check for an error: die $dbh->errstr if ! defined $msg;

Not only after the DB connect, but after the statement is run.

If it works in Toad or sqlplus but not in your perl code, I'd expect DBD::Oracle to throw some errors* which will point you in the right direction. Are you connecting to the same database as the same user in both Toad and your Perl code? Post a short example of your perl code which reproduces the problem, and any output. See Writeup Formatting Tips.

Update * if it doesn't see DBD::Oracles trace method.

Is vsurend using DBD::Oracle? Could be DBD::ODBC or something for all we know.

Also, are all the connections really using the same database/username/password/schema? Different connections may point to different tables (similar looking) tables with different content. (e.g. test database vs. production database).

Another thing, especially with Oracle: vsurend, did you compile DBD::Oracle yourself against the Oracle client you have installed on your machine or did you use some precompiled package like ActiveState's PPMs? DBD::Oracle and Oracle's libraries don't always play nice together, even on minor version differences when using a precompiled version.

"Believe me, Mike, I calculated the odds of this succeeding against the odds I was doing something incredibly stupid… and I went ahead anyway." (Crow in "MST3K The Movie")