topic QlikView: Why do we get "failed to allocate QlikView Engine, when there are free engines in system? in QlikView

QlikView: Why do we get "failed to allocate QlikView Engine, when there are free engines in system?

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

Hi,

There is a task stuck here. The task has been loading, so we killed it manual

When this task is stuck, other tasks will fail to allocate engines.

Error message in the Task logs

Failed to create to create QlikView engine.. Exception=System.Runtime.InteropServices.COMException (0x80080005)

20220330T173556.678+0100 Information Opening document: "[***].qvw" 20220330T181303.684+0100 Information Allocating new QlikView Engine. Current usage count=1 of 12 (of type non-reader). 20220330T181303.684+0100 Information Max retries:5 20220330T181303.684+0100 Information Attempt:01 20220330T181504.215+0100 Error Failed to create QlikView Engine.. Exception=System.Runtime.InteropServices.COMException (0x80080005): [.......] 20220330T181504.215+0100 Information Failed to create QlikView Engine - Cleanup and retry (3 second pause before trying again) ... 20220330T182321.348+0100 Information Attempt:51 20220330T182522.034+0100 Error Failed to create QlikView Engine.. Exception=System.Runtime.InteropServices.COMException (0x80080005): [.......] 20220330T182522.034+0100 Information Failed to create QlikView Engine - Cleanup and retry (3 second pause before trying again) 20220330T182525.035+0100 Warning Failed to allocate new QlikView Engine. Retrying! Current usage count=1 of 12 (of type non-reader). 20220330T182526.035+0100 Error Failed to allocate a QlikView Engine. 20220330T182526.035+0100 Error No QlikView Engine was available after waiting for 45 minutes 20220330T182526.035+0100 Information Document distribution done. 20220330T182526.119+0100 Error The task "[***].qvw" failed.

Thanks

Feng

Re: Error: Failed to allocate a QlikView Engine (There are free engines in system)

Maria_Halley — Thu, 07 Apr 2022 10:42:31 GMT

@Haynes_FengQH

This sounds like you need to adjust the desktop Heap in windows

See the section, windows limitations in the below document.

https://community.qlik.com/t5/Knowledge/How-to-increase-and-how-many-reload-engines-QVB-to-allow-in-an/ta-p/1714967

Re: Error: Failed to allocate a QlikView Engine (There are free engines in system)

Albert_Candelario — Thu, 14 Apr 2022 20:16:56 GMT

Hello @Haynes_FengQH ,

I recall I have been working on a very similar case on QlikView 12.40 version, what version are you using?

QlikView was getting stuck at some point and not able to create more Engines even if none were on use as per your log that says 1 out of 12.

The resolution was either reduce the number of engines at 8 or increase the Desktop Heap size and afterwards all was working smoothly.

Both options should resolve the issue. If having several Distribution nodes please do edit the Desktop Heap size on all of them.

Cheers,

Albert