Solved: Re: Replace Link keys in Qlkview - Qlik Community

ankitg4688 · ‎2017-09-03

Hi,

We can form a link table and a link key when there are multiple common columns across fact tables or dimensions. But, the link key slows down the performance of the dashboard if the data model is complex having many tables. Can we somehow replace this big link key and increase the performance of joins happening at backend and ultimately performance of charts in Dashboard?

Thanks for sharing the knowledge.

Br,

Ankit

effinty2112 · ‎2017-09-09

Hi Ankit,

Autonumber will be a far better choice than Autonumberhash128. An Autonumber field will take up much less memory and associating tables with integer keys gives much better performance than associating with text keys.

Regards

Andrew

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Anil_Babu_Samineni · ‎2017-09-03

I don't believe about performance because Link Key is very attraction and no issue in Perf. respect. Here, I would add my point from a & '|' & b as Composite_Key please change your script to Autonumber(a & '|' & b) as Linked_Key

Note - Chances are there to improve performance. If not, I would ask you to share structure of Data model and rows allocate to the Link Table?

Best Anil, When applicable please mark the correct/appropriate replies as "solution" (you can mark up to 3 "solutions". Please LIKE threads if the provided solution is helpful

ankitg4688 · ‎2017-09-05

Hi Anil,

Thanks for your response. Actually, I am not aware about Autonumber function in case of Link keys. Could you please explain how does this work?

Thanks for sharing the knowledge.

Br,

Ankit

Muthu · ‎2017-09-06

Autonumber function gives a unique integer number in the data model for the table.

autonumber ‒ QlikView

jonathandienst · ‎2017-09-06

Link tables can perform poorly (slow recalculation times) if the cardinality of the link table is high. Autonumbering helps (and reduces the app size too), but I have learnt to be wary of link tables in large data sets.

However, you should have no problems with models of the order of 100k - 1M rows.

Logic will get you from a to b. Imagination will take you everywhere. - A Einstein

ankitg4688 · ‎2017-09-09

Hi Jonathan,

My data model has 200 Million+ rows. 4 fact tables. 2 Common columns which are combined to form Link Key. And I am not using Autonumber function. Is it good to use Autonumber of Autonumberhash128? Will it increase the performance?

Thanks for sharing the knowledge.

Br,

Ankit

effinty2112 · ‎2017-09-09

Hi Ankit,

Autonumber will be a far better choice than Autonumberhash128. An Autonumber field will take up much less memory and associating tables with integer keys gives much better performance than associating with text keys.

Regards

Andrew

ankitg4688 · ‎2017-09-13

Hi Andrew,

Thanks for your response. I will try to implement as suggested.

Thanks for sharing the knowledge.

Br,

Ankit