Tabular model performance

HI,
I have built a small database of size 31 MB on tabular mode. DB querymode is set to InMemory. With simple setup, a normal evaluate dax query is taking 1 sec to retrieve list of sales person which is a dimension table and does not include any calculation.
The other semi complex query are taking 15- 20 secs. The tabular instance setting are set to default as the db size is less and server as total of 7 GB RAM.
Is there any setting that needs to be validated to improve the performance.Because if the model is inmemory then the output should come out in microseconds.
Manohar K - SQL Server DBA Consultant

Hi Manohar,
According to your description, you are experienciing the performance issue when retrieval data from the small SQL Server Analysis Services Tabular model, right?
In tabular model, as you increase the data load, add more users, or run complex queries, you need to have a strategy for maintaining and tuning performance. Here are some links which describe strategies and specific techniques for getting the best performance
from your tabular models, including processing and partitioning strategies, DAX query tuning, and server tuning for specific workloads. Please refer to the links below.
http://msdn.microsoft.com/en-us/library/dn393915.aspx
http://sqlblog.com/blogs/marco_russo/archive/2013/08/05/performance-tuning-of-tabular-models-in-analysis-services-2012-ssas.aspx
Besides, I'd suggest you enable SQL Server profiler to monitor the query, and check which part in the query took a very long time to run. Here is a useful link for your reference.
http://sqlmag.com/database-performance-tuning/using-sql-profiler-tune-mdx-queries
Regards,
Charlie Liao
TechNet Community Support

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Tabular Model Performance Improvements

Hi !
We have a bulitv tabular model inline which has a fact table and 2 dimension tables .The performance of SSRS report is very slow and we have bottle neck in deciding SSRS as reporting tool.
Can you help us on performance improvements with Tabular Inline
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Hi Bhadri,
As Sorna said, it hard to give you the detail tips to improve the tabular model performance according the limited information. Here are some useful link about performance Tuning of Tabular Models in SQL Server 2012 Analysis Services, please refer to the
link below.
http://msdn.microsoft.com/en-us/library/dn393915.aspx
If this is not what you want, please elaborate the detail information, so that we can make further analysis.
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Charlie Liao
TechNet Community Support

SSAS Tabular model Performance Issue

Hello,
We have strange behavior with SSAS tabular model. The Model size is approx. 40GB in memory. Our production server has 200GB memory. Most of the users access the cube via Excel 2013 (64bit). We have been noticing that the performance starts degrading from
the next day after the Analysis service has been restarted or the server rebooted. The day either one of them is performed we get good response but then the next day response times becomes 2 to 3 times more than on the 1st day. Is this something which anyone
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Deepak

Why are you sure role based security is the culprit? Immediately after cube processing or immediately after ClearCache does the report perform fast for a user without any role based security filters? I would recommend reviewing the methodology on page
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http://aka.ms/ASTabPerf2012
http://artisconsulting.com/Blogs/GregGalloway

Performance testing of Tabular model

I have Power View on SharePoint 2013 on tabular model.
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Hi Kenny_I,
According to your description, you want to test the performance of tabular model with SQL Server tools, right? In this case, we can use SQL Profiler to achieve your requirement. Here is a blog which describes using SQL Server to Analyze Analysis Services
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http://blogs.msdn.com/b/johndesch/archive/2014/06/27/using-sql-server-to-analyze-analysis-services-profiler-traces-from-tabular-models.aspx
Besides, here is a similar thread for you reference.
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/649c11a5-b771-4153-b609-e8754d29a9ad/tracing-and-monitoring-mdx-query-against-a-ssas-tabular-model-ssas-2012?forum=sqlanalysisservices
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Charlie Liao
If you have any feedback on our support, please click
here.
Charlie Liao
TechNet Community Support

Reading the DAX query plan of a trace against a query on a Tabular model

Hi,
I'm monitoring a Tabular model queried by an Excel workbook. Inside SQL Profiler I've choosen as events the VertiPaq SE Query End, the Query End and the DAX Query Plan. But this last event isn't more readable.
How can I read the info collected in the DAX Query Plan in a simple manner?
Thanks

It is fairly complex to read the DAX Query Plan. I don't think there are currently tools that make it easier to read. (Watch the DAX Studio project on codeplex as they may include tools for this in the future.) I would recommend you review the Tabular
Performance Guide which has a good explanation of the DAX Query Plan:
http://aka.ms/ASTabPerf2012
http://artisconsulting.com/Blogs/GregGalloway

Optimize Fact tables in SSAS Tabular Model

Hi,
I have five Fact tables in SSAS Tabular Model and each fact table share same dimensions. It creates some performance issue and also the data model looks very complex is there any simplest way to create simple data model using all fact tables. For Ex...
Please suggest me for this ...
Fact Tables:
Fact_Expense
Fact_Sale
Fact_Revenue
Fact_COA
Fact_COG
Dimensions:
Dim_Region
Dim_Entity
Dim_Product
Dim_DateTime
Dim_Project
Dim_Employee
Dim_Customer

Hi hussain,
Please consider merging the Fact tables based on granularity. Generally, if you have enough RAM there will be no performance issues. Make sure you have double the amount of RAM to cater your processing and operational needs.Try
to optimize the model design by removing unused keys and some high cardinality columns.
Please go through the document in the link:
http://msdn.microsoft.com/en-us/library/dn393915.aspx
Regards,
Venkata Koppula

Question on Tabular Model 2012

Hi,
I need to hide certain columns for a user group but the same columns should be visible for another user group in the same model. The out of the box 'row level security' would not work for this requirement. I tried a modelling technique, by bringing
the 'hidden fields' to a table using the 'Blank' DAX function in a 'role' on the table that contains the hidden fields, but this hides all tables related to the table that contains the hidden fields.
As a last resort I am creating two models (1) model one with all fields visible (2) model two will hide certain fields. Basically model 2 is a copy of model 1, only certain fields in model 2 will be hidden.
To avoid reading the source data twice I am planning to update the model 1 and then synchronize model 1 with model 2 ( the one with hidden fields). My gut feeling is that if I synchronize model 1 with model 2, all the hidden fields in model 2
will become visible, as the metadata in model 2 will be updated with metadata of model 1.
As the number of users would be in hundreds, implementing a complex security layer might impact the performance if we try and implement such security on the same model.
It would be great if anybody can share thoughts on the probable solution and if the approach to 'synchonize' both the models would work.
Thanks
Bidyut
A**LE

Hi Bidyut,
According to your description, you want to implement dynamic security for two group users, right? In SQL Server Analysis Services Tabular model, we can implement dynamic security using an external security table but we can integrate this security table into
the existing tables based on particular source data at production implementations. So in your scenario, you can store the users' information on an external table, and then implement the security through this table. Here is a blog which describes how to implement
it step by step, please see:
SSAS – Tabular Dynamic Security
Hope this helps.
Regards,
Charlie Liao
TechNet Community Support

Data "chunking" in SSAS Tabular models

I have a Tabular model I built in VS2013, deployed to SSAS 2014 Tabular, and consumed via SSRS and PowerPivot. Let's say it consists of 4 fact and 1 measure table. The resulting dataset is about 10 million rows, which for some end-users can be a little unwieldy.
I had heard of "partitions", and thought it could help me "chunk" the data into manageable "user friendly" portions of the total measure dataset, but it doesn't appear to behave as I envisioned.
Imagine you have a model with world-wide sales information and you want to maintain that as a master model that you deploy, but want to make portions of the measure data available based on values in a fact table; let's say subsets that represent NA, another
for EU and so on. The geo data is a fact table in the model.
I envisioned "partitions" being select parts of the total model that you expose via partition name that the end user can select to work with like "I'm the AR for the NA region and this is my partition of the WW Sales data cube" How
would one accomplish this?

Hi Torben,
According to your description, you create a SQL Server Analysis Services Tabular model and deploy it to SQL Server 2014 server, and use Reporting Services and Excel to interact with this tabular model. Now the problem is that the resulting dataset is about
10 million rows, which for some end-users can be a little unwieldy, right? If I have anything misunderstood, please point it out.
In your scenario, you want to filter the data base on the user's region to improve the performance issue. In this case, please refer to the links below which describe how to achieve it.
http://blogs.msdn.com/b/analysisservices/archive/2012/08/10/row-level-security-in-analysis-services-2012.aspx
http://grow-n-shine.blogspot.jp/2012/10/defining-row-level-security-in-ssas.html
Besides, to improve your report performance, you can cache your report. Caching can shorten the time required to retrieve a report if the report is large or accessed frequently. Please refer to the link below to see the details.
http://msdn.microsoft.com/en-us/library/ms155927.aspx
Regards,
Charlie Liao
TechNet Community Support

Updation of DAX in SSAS Tabular Model

Hi All,
I have a SSAS tabular model which has around 42 Dimension table and 10 Fact table each containing some thousands
of record.when I am writing some DAX on a FACT to get some measure ,its taking 10-15 minutes time to update one DAX.
I have to write more than 300 measures using DAX.Can anyone please suggest how can I speed up the updation process
in writing DAX.
Thanks in Advance.
Sanjay
sanjay

Hi Sanjay,
According to your description, there are around 42 Dimension table and 10 Fact table each containing some thousands of record in your tabular model, so it takes 10-15 minutes time to update the calculation to server, right?
It's default setting to update the modification to server when change something on your tabular model, if the tables contain large data, it will takes long time to update. In your scenario, we recommend you to use Multidimensional database instead of Tabular
model when having large amount of data with complex requirements.
SQL Server Analysis Services (SSAS) Multidimensional model is used when having large amount of data with complex requirements. In order to improve query performance, there will be a cube doing heavy time-consuming processing and then synchronize it
to query cubes.
However, SSAS Tabular model is used when the data model is relatively simple. So for the large amount data model, we recommend to use Multidimensional database instead of process data on one server then synchronize it to query cubes.
Reference
http://blog.aditi.com/data/choosing-between-analysis-services-multidimensional-and-tabular-models-part-3/
Regards,
Charlie Liao
TechNet Community Support

Analysis Services Tabular Model 2014 vs 2012

Hi,
A very simple question : with the same tabular model is 2014 faster than 2012 from query point of view (is the Storage Engine or Formula Engine faster than the previous version ) ?
Thanks

Hi MIB1,
According to your description, you want to know if the SSAS 2014 tabular model has better performance than SSAS 2012 tabular. Right?
With exception to added functionality supporting Power View Reports against Multidimensional Models, SQL Server 2014 Analysis Services is unchanged from the previous release. There's nothing improvement on SSAS tabular.
Reference:
What's New in Analysis Services and Business Intelligence
If you have any question, please feel free to ask.
Regards,
Simon Hou
TechNet Community Support

Processing of a deployed Tabular model inside SSDT

Hi,
operating inside SSDT, does it exist a manner to process a tabular model (or a table/partition) already deployed on the SSAS instance?
I know that it is possible to process only the workspace data.
Thanks

Hi Pscorca,
According to your description, you want to process data for a tabular model which had already been deployed on the SQL Server Analysis Services instance. When authoring your model project, process actions must be initiated manually in SQL Server Data Tools
(SSDT). After a model has been deployed, process operations can be performed by using SQL Server Management Studio or scheduled by using a script. So we cannot process data for a tabular model which had already been deployed on the SQL Server Analysis Services
instance.
If you have any concern about this behavior, you can submit a feedback at
http://connect.microsoft.com/SQLServer/Feedback and hope it is resolved in the next release of service pack or product.
Thank you for your understanding.
Regards,
Charlie Liao
TechNet Community Support

Evaluation of hw features of a machine hosting a SSAS Tabular model

Hi,
on a machine I've deployed a SSAS Tabular model that has two fact tables having each 200-300 millions of rows, and about 10-15 dimension tables. I've implemented some Excel workbooks, each of them queries one measure of one of the two fact tables.
Each workbook has 10-15 filters/slicers. I've tried some times to reduce the number of filter/slicer or of row expansion and I've registered a query response time from 5 to 15 seconds for a change selection for a filter/slicer. 15 seconds is a time too high
for the user requirements.
The formula for the two measures has some SUMs and DIVIDEs. In order to improve the query performance I've tried to write the formula in different manners and I've created partial calculations in the underlying dwh but with negligible performance improvements.
Cutting filters or slicers or row expansions is against the user requirements.
I've also captured some Profiler traces but with few indications.
I suspect that a possible issue derived from the hw features of the hosting machine. During the use of the pivot table the usage of memory is about 50-60% and the usage of CPU is 80-100%.
With the CPU-Z program I've captured the hw features:
I hope in any suggests deriving from the experiences and not from some papers, fe "Performance Tuning of Tabular Models in SQL Server 2012 Analysis Services", in order to improve the query performance from Excel connected to my tabular model.
Probably, the CPU features are not appropriate.
Many thanks

Hi Pscorca,
Based on your description, you want to if it is best practice for improve the query performance in hardware level by increase RAM or CPU. In this case, here are some document about it, please refer to the links below which might helpful for you.
Forcing NUMA Node affinity for Analysis Services Tabular databases
SSAS Tabular – NUMA and CPU Cores Performance
Regards,
Charlie Liao
TechNet Community Support

SSRS report with tabular model - MDX query to filter parameter data based on Tuple value.

Hello Everyone,
I am working on SSRS report in which a tabular model is being used as a backend.
I want to filter the report parameters which are dependent to other parameters. Like, country, state, and cities drop downs.
All are multi-select parameters. I am using MDX queries to filter the parameters data.
Based on selected one or more countries, the data of states needs to be filtered.
The point is the text which is being displayed in state dropdown for each state name is combination of 3 different members.
So, I created the following Tuple for the same and can see the expected display names in states dropdown.
"("+
[Location].[Code 1].CURRENTMEMBER.UNIQUENAME +","+
[Location].[Code 2].CURRENTMEMBER.UNIQUENAME +","+
[Location].[Descr].CURRENTMEMBER.UNIQUENAME +")"
Now, when I would like filter the cities data based on selected one or more states, I am unable to pass the multiple Tuples (more than one selected Tuples) as parameter for cities dropdown.
The following is my query for City parameter. It is working well when I select only one State from the dropdown.
However, when I select multiple states, it is unable to convert the Tuple into SET in ELSE part of IIF condition specified in following query.
Can anybody help me how to resolve the error that I am getting about STRTOSET function?
Or
Are there any other alternatives to achieve this requirement?
Any help would be much appreciated.
Query:
WITH MEMBER [Measures].[ParameterCaption] AS [City].[City Business].CURRENTMEMBER.MEMBER_CAPTION
MEMBER [Measures].[ParameterValue] AS [City].[City Business].CURRENTMEMBER.UNIQUENAME
MEMBER [Measures].[ParameterLevel] AS [City].[City Business].CURRENTMEMBER.LEVEL.ORDINAL
SELECT {[Measures].[ParameterCaption], [Measures].[ParameterValue], [Measures].[ParameterLevel]} ON COLUMNS ,
[City].[City Business].Children ON ROWS
FROM (
SELECT ( STRTOSET(@State, CONSTRAINED) ) ON COLUMNS FROM [Model])
WHERE ( IIF( STRTOSET(@State).Count= 1,
STRTOTUPLE(@State, CONSTRAINED),
STRTOSET("{
("+
[Location].[Code 1].CURRENTMEMBER.UNIQUENAME +","+
[Location].[Code 2].CURRENTMEMBER.UNIQUENAME +","+
[Location].[Descr].CURRENTMEMBER.UNIQUENAME
+ ")
}",CONSTRAINED )) ) CELL PROPERTIES VALUE
Thanks, Ankit Shah
Inkey Solutions, India.
Microsoft Certified Business Management Solutions Professionals
http://www.inkeysolutions.com/MicrosoftDynamicsCRM.html

Hi,
I used following dynamic query in expression of dataset of parameter and it works like a charm.
"WITH MEMBER [Measures].[ParameterCaption] AS [City].[City Business].CURRENTMEMBER.MEMBER_CAPTION "&
"MEMBER [Measures].[ParameterValue] AS [City].[City Business].CURRENTMEMBER.UNIQUENAME "&
"MEMBER [Measures].[ParameterLevel] AS [City].[City Business].CURRENTMEMBER.LEVEL.ORDINAL "&
"SELECT {[Measures].[ParameterCaption], [Measures].[ParameterValue], [Measures].[ParameterLevel]} ON COLUMNS , " &
"[City].[City Business].Children ON ROWS " &
" FROM [Model] WHERE ({"& join(Parameters!Location.Value,",") &"}) CELL PROPERTIES VALUE"
Thanks, Ankit Shah
Inkey Solutions, India.
Microsoft Certified Business Management Solutions Professionals
http://www.inkeysolutions.com/MicrosoftDynamicsCRM.html

Report using Tabular Model and Measures based on Distinct Counts

Hello,
I am creating a report that should present something like this:
YEAR-1 | MONTH-1 | MONTH-2 | MONTH-3... | YEAR | MONTH-1 | MONTH-2 | MONTH-3...
My problem is that when designing the dataset to support this layout I drag the Year, Month and Distinct count Measure, but on the report when I want the value for the YEAR level I don't have it and I cannot sum the months value...
What is the best aproach to solve this? Do I really have to go to advanced mode and customize my MDX or DAX? Can't basic users do something like this that seems so trivial and needed?
Thank you
Luis Simões

Hi Luis,
According to your description, you create a Reporting Services report using Analysis Service Tabular Model as the datasource, now what you want is sum the months value on year level, right?
In your scenario, you can add the Month field to column group, add a parent group using Year Field and then add a Total on Month group. In this case, Reporting Services will sum the months value on Year level. I have tested it on my local environment, the
screenshot below is for you reference.
Reference:Lesson 6: Adding Grouping and Totals (Reporting Services)
If this is not what you want, please describe your dataset structure, so that we can make further analysis.
Regards,
Charlie Liao
TechNet Community Support

SSRS report with tabular model – MDX query CoalesceEmpty function does not return the provided string value

Hello everyone,
I created following calculated member in MDX query. I am using it in one of the report parameter in dataset (single select dropdown list as report parameter).
WITH MEMBER [Measures].[ParameterCaption] AS
CoalesceEmpty([Customer].[National Account Code].CURRENTMEMBER.MEMBER_CAPTION,'None')
I would like to display 'None' text at the top of the dropdown list values. So that when user selects 'None' then this parameter will not considered in MDX query else the selected National Account Code will be considered to filter report data. But,
the above return blank/empty value for [Customer].[National Account Code].& member though I specified 'None' as text in CoalesceEmpty function. Any advice would be appreciated.
Thanks, Ankit Shah
Inkey Solutions, India.
Microsoft Certified Business Management Solutions Professionals
http://www.inkeysolutions.com/MicrosoftDynamicsCRM.html

Hi Ankit,
It seems that you issue had been solved in your another thread.
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/5a5becac-226f-428a-95b0-aaaa22733818/ssrs-report-with-tabular-model-create-a-dropdown-report-parameter-with-none-option-as-the-top?forum=sqlanalysisservices#0e51bf8c-a66c-4df5-a244-0147728fdfdb
iif([Customer].[National Account Code].CURRENTMEMBER.MEMBER_CAPTION="","None",[Customer].[National
Account Code].CURRENTMEMBER.MEMBER_CAPTION)
I marked this reply as answer, it will benefit to other members who have the similar issue.
Regards,
Charlie Liao
TechNet Community Support

Tabular model performance

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