topic How long a QVD resides in RAM while read by a task in App Development

How long a QVD resides in RAM while read by a task

HaseebIqbal — Mon, 04 Nov 2024 00:09:51 GMT

How long a QVD(i.e. 12GB in size) resides in RAM while read by a task.

Scenario:

If Task 1,2, 3 reads the same QVD file, then Task 4,5 reads after a 30 minutes, will all the task read the same file in the allocated RAM

or each task loads separate copy in the RAM and closes at the end of each task?

Platform: Qlik Sense Enterprise Windows February 2024 P5 multi node.

Re: How long a QVD resides in RAM while read by a task

pallavi_96 — Mon, 04 Nov 2024 08:44:01 GMT

Hi @HaseebIqbal

As per my understanding, they will access the same data already loaded into memory rather than creating separate copies. This makes it efficient for data handling and reduces unnecessary reloading of data.

Re: How long a QVD resides in RAM while read by a task

rwunderlich — Mon, 04 Nov 2024 14:55:09 GMT

@pallavi_96 Interesting. I have not seen any evidence of that. What I see when monitoring I/O and Memory is that each LOAD statement will read the QVD and allocate RAM. Do you have some reference otherwise? Or are we talking about the reuse of the App by analysis users?

-Rob