The query should be executed by Oracle, not by the driver, hence the complexity should not matter. As marto said, turn on error reporting.

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)"

. Get's rid of the OR and only requires the literal once.

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');

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