Monitoring SQL Queries

Question

I work with IBM Cognos Business Intelligence software. Clients create reports. The data is on SQL Server 2008 R2. The client writes reports and behind the scenes Cognos creates SQL queries to retrieve the data for the report. I do not have access within
Cognos to view all the SQL queries used to create a report. Sometimes the reports are really complicated, with many calculations on large amounts of data, and they can run for hours. How can i see the actual queries that are causing the problems? I would
need to limit it to a specific database at a minimum.

Answer 1

Your question is very general. The slowness could be caused be missing index, resource bottleneck etc.  You need start investigate where sql server is waiting the time,this can done by wait stats analysis.  use the code bellow find out the wait 
WITH Waits AS
(SELECT wait_type, wait_time_ms / 1000. AS wait_time_s,
100. * wait_time_ms / SUM(wait_time_ms) OVER() AS pct,
ROW_NUMBER() OVER(ORDER BY wait_time_ms DESC) AS rn
FROM sys.dm_os_wait_stats
WHERE wait_type NOT IN ('CLR_SEMAPHORE','LAZYWRITER_SLEEP','RESOURCE_QUEUE','SLEEP_TASK'
,'SLEEP_SYSTEMTASK','SQLTRACE_BUFFER_FLUSH','WAITFOR', 'LOGMGR_QUEUE','CHECKPOINT_QUEUE'
,'REQUEST_FOR_DEADLOCK_SEARCH','XE_TIMER_EVENT','BROKER_TO_FLUSH','BROKER_TASK_STOP','CLR_MANUAL_EVENT'
,'CLR_AUTO_EVENT','DISPATCHER_QUEUE_SEMAPHORE', 'FT_IFTS_SCHEDULER_IDLE_WAIT'
,'XE_DISPATCHER_WAIT', 'XE_DISPATCHER_JOIN', 'SQLTRACE_INCREMENTAL_FLUSH_SLEEP'))
SELECT W1.wait_type,
CAST(W1.wait_time_s AS DECIMAL(12, 2)) AS wait_time_s,
CAST(W1.pct AS DECIMAL(12, 2)) AS pct,
CAST(SUM(W2.pct) AS DECIMAL(12, 2)) AS running_pct
FROM Waits AS W1
INNER JOIN Waits AS W2
ON W2.rn <= W1.rn
GROUP BY W1.rn, W1.wait_type, W1.wait_time_s, W1.pct
HAVING SUM(W2.pct) - W1.pct < 99 OPTION (RECOMPILE);
Also pls see the link 
http://technet.microsoft.com/en-us/library/dd672789(v=sql.100).aspx
vt
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