SSAS performance issues

Question

Hello everyone, I have two analytics databases - created by me and a third-party company (professionals). The fact is that when I try to build a pivot table in my cubes, it hangs very badly for me. Specifically - when I add a dimension to the columns. Query Analyzer says that all sections of all cubes are read at this time. After all this, the dimension is added to the report as follows:

That is, all sections of all cubes were viewed and dates were added for which there are facts.
When adding a dimension to cubes compiled by professionals, this does not happen, it looks like this:

What setting is responsible for this parameter, I did not understand.
I need to do the same as for professionals - so that when adding dimensions, all sections are not read

Answer 1

Hi @Кирилл Андреев ,

Please correct me if my understanding is wrong, you are facing performance issue when adding multiple dimension attributes to column, and did not add any measure with it, right? If this is the case, I would suggest you to add a measure to eliminate the blank value. Without measure, dimension attributes will do cross full join for all the value, that will generate a lots of invalid records, thus you might get performance issue.

For other scenarios, you might need to use SQL Server Profiler to capture the duration when you make this report, and focus on the longest time to see if you can tune something.

Regards，

Zoe

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Answer 2

Going for the simplest possible explanations, looks like the second cube has a NULL measure, probably created with MDX, defined as the default measure. The first cube, on the other hand, seems to be missing aggregations, because no measure should take too long to calculate for just 5 years and a total while also causing all the partitions to be read.