Skip to main content
Live today at 11 AM ET. Get your questions about Qlik Connect answered, or just listen in. SIGN UP NOW

Qlik Catalog Data Loads fail due Out of Memory Error

100% helpful (1/1)
Showing results for 
Search instead for 
Did you mean: 

Qlik Catalog Data Loads fail due Out of Memory Error

Last Update:

Dec 14, 2023 9:48:20 AM

Updated By:


Created date:

Dec 14, 2023 9:48:20 AM

Qlik Catalog Data loads fail to complete due to an out of memory error.

The issue can be addressed by either increasing memory on the host running Qlik Catalog and engine or by decreasing the number of concurrent loads Catalog will process (32 by default). You may need to do both.


Decrease the number of concurrent loads to 4.

The setting is changed in the file located in the directory: QDC_HOME/<Tomcat>/conf/

A Tomcat restart is required after making the change in the file.

Make the change when no loads are running. Find and edit the following (do not add a new entry):

# Number of Java threads in pool used for each of loading data, prepare and publish.
# Restart required. Default: 32

If the loads are successful, increase the count gradually and continue testing.

If it is easy to provision more RAM, consider doing so.



Qlik Catalog uses the "engine" container to convert QVDs to CSVs (in order to sample and profile the data). The issue is that engine is running out of memory attempting to concurrently process several QVDs. Sometimes engine gracefully handles the memory exhaustion and returns an error to Qlik Catalog. Other times engine crashes and the container is restarted. In both cases, the job status is FAILED in Qlik Catalog.



Labels (1)
Version history
Last update:
‎2023-12-14 09:48 AM
Updated by: