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HomeHomeUsing DNN Platf...Using DNN Platf...Administration ...Administration ...Schedule tasks retain more rows than specifiedSchedule tasks retain more rows than specified
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1/12/2007 6:26 AM
 
Pablo Fridlender

Joined: 12/23/2005
Posts: 11

Hi,

(sorry if this post is duplicated, I have had problems with the first try).

I have had lots of performance problems these last 3 weeks and I've found that they come from the ScheduleHistory table that grows beyond the specified limits.

What I mean is that there are two tasks: PurgeUsersOnline and PurgeLogBuffer that are configured to retain only 60 rows but they have far more rows (they reached even 2000). These tasks are scheduled to run every 1 minute; of course I can change that value, but: how come they have more than 60 rows??

If I run this SQL:

select ScheduleHistory.ScheduleID, Schedule.TypeFullName, Schedule.TimeLapse, Schedule.TimeLapseMeasurement, Schedule.RetainHistoryNum, count (*) as row_count
from ScheduleHistory join Schedule on (ScheduleHistory.ScheduleID = Schedule.ScheduleID)
group by ScheduleHistory.ScheduleID, Schedule.TypeFullName, Schedule.TimeLapse, Schedule.TimeLapseMeasurement, Schedule.RetainHistoryNum

I get the following result:

ScheduleID TypeFullName TimeLapse TimeLapseMeasurement RetainHistoryNum row_count
3 DotNetNuke.Services.Scheduling.PurgeScheduleHistory, DOTNETNUKE 1 d 60 60
6 DotNetNuke.Services.Search.SearchEngineScheduler, DOTNETNUKE 30 m 60 60
9 DotNetNuke.Services.Cache.PurgeCache, DOTNETNUKE 2 h 10 44
12 ActiveModules.Forums.MailConnector.MailConnectorScheduler, ACTIVEMODULES.FORUMS.MAILCONNECTOR 2 m 60 60
7 DotNetNuke.Modules.Admin.ResourceInstaller.InstallResources, DOTNETNUKE 30 m 60 320
1 DotNetNuke.Entities.Users.PurgeUsersOnline, DOTNETNUKE 1 m 60 2061
4 DotNetNuke.Services.Log.EventLog.PurgeLogBuffer, DOTNETNUKE 1 m 60 1962
2 DotNetNuke.Services.Log.SiteLog.PurgeSiteLog, DOTNETNUKE 1 d 10 11
13 XepientSolutions.XSSearchSpider.XSSearchSpider, XepientSolutions.XSSearchSpider 4 d 5 8
5 DotNetNuke.Services.Log.EventLog.SendLogNotifications, DOTNETNUKE 5 m 60 820
8 DotNetNuke.Services.FileSystem.SynchronizeFileSystem, DOTNETNUKE 1 h 10 10

My site is using DNN 4.40. What is it going wrong?

Thanks in advance,

Pablo.
 
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1/12/2007 9:55 AM
 
Pablo Fridlender

Joined: 12/23/2005
Posts: 11

Well, I have found the way to solve it.

If I configure the schedule task "PurgeScheduleHistory" to run every 15 minutes, it takes care of removing the exceeding rows of each task.

So I was wrong thinking that each task is responsible of removing its old rows. The only task that keeps the right amount of rows is "PurgeScheduleHistory". If you don't run it frequently, your ScheduleHistory table grows and your DNN dedicates the whole cpu time to SQL Server.

Hope it helps someone else!

Pablo. 
 
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HomeHomeUsing DNN Platf...Using DNN Platf...Administration ...Administration ...Schedule tasks retain more rows than specifiedSchedule tasks retain more rows than specified


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