Qlik Community

QlikView Deployment

Discussion Board for collaboration related to QlikView Deployment.

QlikView Fans! We’d love to hear from you.
Share your QlikView feedback with the product team… Click here to participate in our 5-minute survey.
Rules, plus terms and conditions, can be found here.

Performance: ApplyMap in Preceding Map


I have noticed that this script runs about 4 times slower than the script at the bottom :


ApplyMap ( 'MapSicknessHours' , [SCD Environment Date Employee Key] , 0 ) as [Sickness Hours] ,




  [SCD Environment] & '|' &  [Date] & '|' &  [SCD Employee Number] as [SCD Environment Date Employee Key]  ,


resident Temp10


Whereas eliminating the Preceding Load is 4 times faster :


  ApplyMap ( 'MapSicknessHours' , [SCD Environment] & '|' &  [Date] & '|' &  [SCD Employee Number] , 0 ) as [Sickness Hours]
resident Temp10


I am curious as to why is the case.  Any ideas anybody ?

Normally I love preceding loads, but not in this case.

Best Regards,     Bill

1 Reply

Re: Performance: ApplyMap in Preceding Map

Hi Bill,

The two scripts are not comparable.  In the preceding load, you are keeping the additional field "SCD Environment Date Employee Key".  It's a large string field, so could have significant impact on performance. An interesting comparison would be to not use * on the top load, but list the fields and don't keep "SCD Environment Date Employee Key".

In any case, I don't recommend using Preceding load in this scenario (adding one field). There is no benefit.


Community Browser