February 5, 2014 at 11:33 am
Hi All,
We have a Cube that will be refreshed daily, and lately its been taking more than an hour for refreshing and as a result Cube refresh process has been failing in many occasions. My Colleague ran the Activity Monitor on the base database and found the below mentioned query running many times. He forwarded it to me asking its purpose.
"
SET NOCOUNT ON;
DECLARE @previous_collection_time datetime;
DECLARE @previous_request_count bigint;
DECLARE @current_collection_time datetime;
DECLARE @current_request_count bigint;
DECLARE @batch_requests_per_sec bigint;
DECLARE @interval_sec bigint;
-- Get the previous snapshot's time and batch request count
SELECT TOP 1 @previous_collection_time = collection_time, @previous_request_count = request_count
FROM #am_request_count
ORDER BY collection_time DESC;
-- Get the current total time and batch request count
SET @current_collection_time = GETDATE();
SELECT @current_request_count = cntr_value
FROM sys.sysperfinfo
WHERE counter_name = 'Batch Requests/sec' COLLATE Latin1_General_BIN;
SET @interval_sec =
-- Avoid divide-by-zero
CASE
WHEN DATEDIFF (second, @previous_collection_time, @current_collection_time) = 0 THEN 1
ELSE DATEDIFF (second, @previous_collection_time, @current_collection_time)
END;
-- Calc the Batch Requests/sec rate for the just-completed time interval.
SET @batch_requests_per_sec = (@current_request_count - @previous_request_count) / @interval_sec;
-- Save off current batch count
INSERT INTO #am_request_count (collection_time, request_count)
VALUES (@current_collection_time, @current_request_count);
-- Return the batch requests/sec rate for the just-completed time interval.
SELECT ISNULL (@batch_requests_per_sec, 0) AS batch_requests_per_sec;
-- Get rid of all but the most recent snapshot's data
DELETE FROM #am_request_count WHERE collection_time < @current_collection_time;
"
After some research on this i came to the conclusion that the query is being generated by the system for event logging.
Can someone please tell me why the above query was generated and what is it used for?
Thanks in advance.
February 5, 2014 at 11:50 am
Looks like related to Activity Monitor.
See these links...
http://stackoverflow.com/questions/4021428/where-are-all-those-sql-server-sessions-from
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