I tries to check the SQL Scripts several months ago, actually I didn't run any application which connected my database and also didn't run SQL Script manually, meanwhile, there is no any jobs in the back-end; but I found there were many pieces of SQL scripts captured by SQL Server profiler， such as the follwoing T-SQL; then I checked the jobs of my database and no job was working at that time, it made me surprised, then I double checked the the result of SQL Server profiler, finally found I installed the plugin of reportserver and its services was working. so that was the root reason.
AIM:
1. once you install reportserver in your computer if the status of its service running, even if you don't do anything in it, it will take up some some resource of your server. if not used, please disable its service.
declare @BatchID uniqueidentifier
set @BatchID = newid()
UPDATE [Notifications] WITH (TABLOCKX)
SET [BatchID] = @BatchID,
[ProcessStart] = GETUTCDATE(),
[ProcessHeartbeat] = GETUTCDATE()
FROM (
SELECT TOP 4 [NotificationID] FROM [Notifications] WITH (TABLOCKX) WHERE ProcessStart is NULL and
(ProcessAfter is NULL or ProcessAfter < GETUTCDATE()) ORDER BY [NotificationEntered]
) AS t1
WHERE [Notifications].[NotificationID] = t1.[NotificationID]
select top 4
-- Notification data
N.[NotificationID],
N.[SubscriptionID],
N.[ActivationID],
N.[ReportID],
N.[SnapShotDate],
N.[DeliveryExtension],
N.[ExtensionSettings],
N.[Locale],
N.[Parameters],
N.[SubscriptionLastRunTime],
N.[ProcessStart],
N.[NotificationEntered],
N.[Attempt],
N.[IsDataDriven],
SUSER_SNAME(Owner.[Sid]),
Owner.[UserName],
-- Report Data
O.[Path],
N.[ReportZone],
O.[Type],
SD.NtSecDescPrimary,
N.[Version],
Owner.[AuthType]
from
[Notifications] N with (TABLOCKX) inner join [Catalog] O on O.[ItemID] = N.[ReportID]
inner join [Users] Owner on N.SubscriptionOwnerID = Owner.UserID
left outer join [SecData] SD on O.[PolicyID] = SD.[PolicyID] AND SD.AuthType = Owner.AuthType
where
N.[BatchID] = @BatchID
ORDER BY [NotificationEntered]