topic Re: When will the documents start to unload? in QlikView

When will the documents start to unload?

jasonseril — Mon, 26 Jan 2026 18:19:17 GMT

Hello All,

The image below shows the QlikView Server memory allocation.

My question is with the "Documents start unload"; after the "All sessions timed out", what time or when will the documents start to unload? How many minutes or seconds after all the sessions timed out? Where can we set this time in the QMC?

Thanks in advance and more power!

Best regards,

Jason

Re: When will the documents start to unload?

swuehl — Fri, 22 Jan 2016 10:48:10 GMT

AFAIK, you can set the document timeout on QMC -> System -> YourQV-Server -> Documents -> Document timeout

Documents

On the Documents tab, the settings for document control can be managed.

ServerDocument TimeoutOpen documents take up valuable system resources (that is, memory space, RAM, is allocated) and should not be allowed to remain open when not in use. However, if a document is closed too quickly, the users may get longer delay times when accessing the document, because the server has to reopen it. This value controls for how long a document will be allowed to be unused before the QlikView Server (QVS) closes the document and reclaims the resources.

Default value: 480 minutes.

Re: When will the documents start to unload?

Peter_Cammaert — Fri, 22 Jan 2016 10:52:02 GMT

I do apologize for asking another question instead of trying to give you an answer. Where does this image come from?

Peter

Re: When will the documents start to unload?

Peter_Cammaert — Fri, 22 Jan 2016 10:55:07 GMT

Don't you think there is something weird in this graph? "All sessions timed out"???

Re: When will the documents start to unload?

swuehl — Fri, 22 Jan 2016 10:57:29 GMT

The graph originates from

DS-Technical-Brief-QlikView-Server-Memory-Management-and-CPU-Utilization-EN.pdf

You can download this technical doc from Qlik.com resources.

Re: When will the documents start to unload?

swuehl — Fri, 22 Jan 2016 10:58:17 GMT

Don't you think there is something weird in this graph? "All sessions timed out"???

Can you detail the weirdness? Maybe I am missing something here?

Re: When will the documents start to unload?

Peter_Cammaert — Fri, 22 Jan 2016 11:00:42 GMT

Ok thanks, I'll do that in a minute.

Re: When will the documents start to unload?

Peter_Cammaert — Fri, 22 Jan 2016 11:05:07 GMT

If documents are memory-managed individually with a single global timeout (that's what the help text you posted seems to imply), then why is the first app thrown out sooner than the third app? Just bad scaling? Think so...

Re: When will the documents start to unload?

Peter_Cammaert — Fri, 22 Jan 2016 11:10:45 GMT

Sorry, I wasn't clear enough.

With sooner I meant "after a smaller delay" than the third app. I didn't mean to say that the first app shouln't be thrown out first.

Re: When will the documents start to unload?

swuehl — Fri, 22 Jan 2016 11:11:22 GMT

No sure if I understand your point.

Overall, the graph is just a sketch, not a precise documentation.

Apps seems to be loaded / unloaded in same sequence. Since we don't know the user interaction inbetween (i.e. when users stopped interacting with each application) I can't derive much from the graph with regard to the server setting (yes, I believe the setting is affecting all documents in the same way, but I think the timeout is evaluated per document) or if the unloading sequence is plausible or not.

Re: When will the documents start to unload?

Peter_Cammaert — Fri, 22 Jan 2016 11:22:00 GMT

Jason,

IMHO your red markers indicate no measurable or significant value. The graph is a bit misleading in that there is no relation between "All Sessions Timed Out" and the first app getting unloaded. There is a relation however between "All Sessions Timed Out" and the very last app getting unloaded. That is the value of the Document Timeout parameter Stefan is talking about.

Best,

Peter

Re: When will the documents start to unload?

Peter_Cammaert — Fri, 22 Jan 2016 11:34:14 GMT

My point is moot, since you correctly pointed out that it's just a sketch.

I was assuming that while no real values are present in this graph, it should still respect ratio's and scaling. Otherwise wrong conclusions may be drawn from this image or people may get confused (like myself). Bad sketch.

Re: When will the documents start to unload?

swuehl — Fri, 22 Jan 2016 11:37:03 GMT

Right,

it would also be helpful if the document would actually reference the settings you can utilize to control the server behaviour.

Still some things to improve in QV documentation.

Re: When will the documents start to unload?

gsbeaton — Fri, 22 Jan 2016 12:45:17 GMT

Hi Jason,

I don't think this thread came to a satisfactory answer on this? However, lets just be clear on what you are asking. The actually amount of memory allocated to the application upon loading may not be that important. If you have an application that is 1gig on file, then I would expect it to be allocated 1 gig memory upon loading (this is only a hunch, I haven't tested this). What will start consuming a lot of memory is your cached results, and these will persist long after all your applications have timed out, until new more recent requests overwrite them (once your working set max has been reached).

Here's a relevant snippet from the same document the chart came from:

When the application is unloaded from memory the total amount of allocated memory will

drop by the same amount as originally allocated by the application. However, cached result

sets will persist in memory as there is no reason to remove any cached result set that might

be beneficial later on if there are no other requests for usage of the allocated memory.

I'd be interested to know at what point the original allocation is unloaded after the users sessions have timed out though.

George

Re: When will the documents start to unload?

Peter_Cammaert — Fri, 22 Jan 2016 12:53:44 GMT

I think Stefan answered your (and Jasons) question early on:

QMC -> System -> YourQV-Server -> Documents -> Document timeout

Re: When will the documents start to unload?

korsikov — Fri, 14 Mar 2025 15:18:41 GMT

Is it possible that Qlik applications without active user sessions will be unloaded earlier than the timeout set in QMC due to lack of resources, including RAM?

I'm found row in System_Engine.log file

DOC loading: Unloading document 86c9299d-dd03-4bbf-beaa-6bff423271d6, state UNLOADING overload mode.

Where is can found addition information about "overload mode."?