Improving SSAS Tabular processing performances

Hi,
I need to know if it is possible to improve the full process of a/more large Tabular table/s without using another processing option (fe not using process add), but acting on ssas instance settings.
Any suggests to me, please?

The bad news is that processing those tables from the SSMS GUI ends up processing them in serial. The good news is that if you click the Script button instead of the OK button and then add a <Parallel> tag around both Process commands, it will process
both tables in serial. Other than that, I encourage you to read the Tabular Performance Guide mentioned above for other tips like changing the PacketSize.
http://artisconsulting.com/Blogs/GregGalloway

Similar Messages

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
else has experienced. We are entering in a mode where we are required to restart the service almost everyday.
Any help in this matter would be greatly appreciated.
Thanks
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
35 of the tabular performance guide to see if it is a storage engine or formula engine bottleneck and report back.
http://aka.ms/ASTabPerf2012
http://artisconsulting.com/Blogs/GregGalloway

Is there a best way of improving short lived process performance?

Hi,
Apart from setting the thread pooling option in adminui, cacheing the form templates, What other options are available for performance improvement ?
We tried setting the thread pool options and no much difference was found in response time.
Any info on this would be helpful.
Thanks,
Srikanth

Hi,
Apart from setting the thread pooling option in adminui, cacheing the form templates, What other options are available for performance improvement ?
We tried setting the thread pool options and no much difference was found in response time.
Any info on this would be helpful.
Thanks,
Srikanth

Slow Query Performance During Process Of SSAS Tabular

As part of My SSAS Tabular Process Script Task in a SSIS Package, I read all new rows from the database and insert them to Tabular database using Process Add. The process works fine but for the duration of the Process Add, user queries to my Tabular model
becomes very slow.
Is there a way to prevent the impact of Process Add on user queries? Users need near real time queries.
I am using SQL Server 2012 SP2.
Thanks

Hi AL.M,
According to your description, when you query the tabular during Process Add, the performance is slow. Right?
In Analysis Services, it's not supported to make a MDX/DAX query ignore the Process Add of the tabular. it will always query the updated tabular. In this scenario, if you really need good query performance, I suggest you create two tabular.
One is for end users to get data, the other one is used for update(full process). After the Process is done, let the users query the updated tabular.
If you have any question, please feel free to ask.
Regards,
Simon Hou
TechNet Community Support

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
Regards,

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.
Regards,
Charlie Liao
TechNet Community Support

SSAS Tabular slow (full) processing when server is up for more than a day

Setup: SQL 2014 CU3. Machine with 2 physical CPUs and 384GB of RAM. Windows 2012R2.
96GB allocated to SQL Server, rest allocated to Vertipaq/Tabular.
Problem: after a restart of Analysis Services (Tabular), processing time for full processing is fine. Processing of the main table runs with 145000 rows/sec for one cube, and 60000 rows/sec for the other.
After a day of uptime, full processing is slower by a factor of 2-3. For the second cube, performance stays at a low ~ 18000 rows/sec for subsequent full processing.
Performance counter says "memory Limit Vertipaq KB" ~ 280GB, "while memory usage KB" ~ 63GB. There should be plenty of free memory.
SQL Queries for the tabular data are fine and extremely simple and high performance.
I can reproduce the effect at will.
Is this a known bug?

Please try to clear the cache and check if this issue is persists or not.
http://msdn.microsoft.com/en-IN/library/hh230974.aspx
Besides, here are some links about tabular memory setting, please refer to the links below.
http://www.sqlbi.com/articles/memory-settings-in-tabular-instances-of-analysis-services/
http://www.sqlbi.com/articles/memory-settings-in-tabular-instances-of-analysis-services/

SSAS 2012 Tabular Processing in 32 bit mode

Hi All, My SSAS tabular connects to Teradata using the OLEDB providers from Teradata. Unfortunately Teradata only provides 32 bit OLEDB provider and not the 64 bit. So in SSDT I can connect to the Teradata source, select the tables but while importing it
fails with the error TDOLEDB is not registered. I fear this is because SSAS is trying to find the 64 bit driver as my server is 64 bit. Any workarounds on how to proceed? SSIS has an option of specifying 32 bit runtime, is there something similar for SSAS
Processing? Teradata is not going to provide the 64 bit driver soon, does this mean I should switch to ODBC? Any help appreciated.
Thanks, Ashish Singh

Have a look at this... This might help you...
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/1b10a45c-47cf-4d91-a8a4-d4cbeacec304/error-deploying-a-cube-using-an-oracle-client?forum=sqlanalysisservices
Please mark as answer, if this has helped you solve the issue.
Good Luck :) .. visit www.sqlsaga.com for more t-sql code snippetts and BI related how to articles.

Improving ODM Process Performance

Hi Everyone,
I'm running several workflow on sqldeveloper data miner tools to create my model. My Data is around 3 million rows, to monitor the process I look to oracle enterprise manager.
From what I've seen in oracle enterprise manage most of process ODM from my modelling didn't get parallel and sometimes my process not finished more than a day.
Any tips/suggestion how we can improve ODM Process Performance ? By enable parallelism on each process/query maybe ?
Thanks

Ensure that any input table used in modeling or scoring has a PARALLEL attribute set properly. Since minig algorithms are usually CPU bound try to utilize whatevet CPU power you have. Following might be a good starting point:
ALTER TABLE myminingtable PARALLEL <Number of Physical Cores on your Hardware>;

SSAS Tabular: Show balance on latest dimension attribute

Hi,
I have a fact with transactions over time eg.
20140101, 1000
20140105,-400
In SSAS Tabular, I want to add a balance (saldo) measure, that shows the balance on any given date from my date dimension
Balance 20140106: 600
I can do this by using SUMX (or summarize)
Saldo:=SUMX(
VALUES('Date'[Date])
,CALCULATE(
SUM(Fact[Amount])
,DATESBETWEEN('Date'[Date],BLANK(),LASTDATE('Date'[Date]))
,ALL('Date')
The issue arises when I want to show the balance for an attribute from a dimension related to the latest fact entry. I can calculate this on dates that has transactions like this:
Saldo_MaxFact:=MAXX(
VALUES('Fact'[FactId])
,CALCULATE(
SUM(Fact[Amount])
,DATESBETWEEN('Date'[Date],BLANK(),LASTDATE('Date'[Date]))
,ALL('Date')
,ALL('Fact'[FactId])
,ALL('Dimension')
But on dates with no transactions, this measure is empty (which makes sense, since there is no FactId to roll-up the sum to).
How would I go about creating a measure that rolls up to any given date AND the attributes on the latest fact entry?
I have created a sample snapshot: http://1drv.ms/1ly4o6a
Sample Excel Power Pivot model: http://1drv.ms/1jy2nkX
Any help would be much appreciated!

Hi Greg,
Finally I found the problem why the query goes out of memory in tabular mode. I guess this information will helpful for others and I am posting my findings.
Some of the non-key attribute columns in the tabular model tables (mainly the tables which form dimensions) do not contain pretty names. So for the non-key attribute columns which I need to provide pretty names I renamed the columns to something else.
For an example, in my date dimension there is a non-key attribute named “DateAltKey”. This is the date column which I am using. As this is not pretty to the client tools I renamed this column as “Date” inside the designer (Dimension
design screen). I deployed the cube, processed the cube and no problem.
Now here comes the fun part. For every table, inside the Tables node (Tabular SSAS Database > Tables) you can view the partition details. You have single partition per dimension table if you do not create extra partitions. I opened the partitions screen
and clicked on the “Edit” icon and performed a Syntax Check. Surprisingly it failed. It complains about the renamed column. It complained “Date” cannot be found in source. So I realized that I cannot simply rename the columns like that.
After that I created calculated columns (with a pretty name) for all the columns which complained and all the source columns to the calculated columns were hid from the client tools. I deployed the cube, processed the cube and performed a
syntax check. No errors and everything were perfect.
I ran the query which gave me trouble and guess what... it executed within 5 seconds. My problem is solved. I really do not know who did this improve the performance but the trick worked for me.
Thanks a lot for your support.
Chandima

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

Excel SSAS Tabular error: An error occurred during an attempt to establish a connection to the external data source

Hello there,
I have an Excel report I created which works perfectly fine on my dev environment, but fails on my test environment when I try to do a data refresh.
The key difference between both dev and test environments is that in dev, everything is installed in one server:
SharePoint 2013
SQL 2012: Database Instance, SSAS Instance, SSRS for SharePoint, SSAS POWERPIVOT instance (Powerpivot for SharePoint).
In my test and production environments, the architecture is different:
SQL DB Servers in High Availability (irrelevant for this report since it is connecting to the tabular model, just FYI)
SQL SSAS Tabular server (contains a tabular model that processes data from the SQL DBs).
2x SharePoint Application Servers (we installed both SSRS and PowerPivot for SharePoint on these servers)
2x SharePoint FrontEnd Servers (contain the SSRS and PowerPivot add-ins).
Now in dev, test and production, I can run PowerPivot reports that have been created in SharePoint without any issues. Those reports can access the SSAS Tabular model without any issues, and perform data refresh and OLAP functions (slicing, dicing, etc).
The problem is with Excel reports (i.e. .xlsx files) uploaded to SharePoint. While I can open them, I am having a hard time performing a data refresh. The error I get is:
"An error occurred during an attempt to establish a connection to the external data source [...]"
I ran SQL Profiler on my SSAS Server where the Tabular instance is and I noticed that every time I try to perform a data refresh, I get the following entries:
Every time I try to perform a data refresh, two entries under the user name ANONYMOUS LOGON.
Since things work without any issues on my single-server dev environment, I tried running SQL Server Profiler there as well to see what I get.
As you can see from the above, in the dev environment the query runs without any issues and the user name logged is in fact my username from the dev environment domain. I also have a separated user for the test domain, and another for the production domain.
Now upon some preliminary investigation I believe this has something to do with the data connection settings in Excel and the usage (or no usage) of secure store. This is what I can vouch for so far:
Library containing reports is configured as trusted in SharePoint Central Admin.
Library containing data connections is configured as trusted in SharePoint Central Admin.
The Data Provider referenced in the Excel report (MSOLAP.5) is configured as trusted in SharePoint Central Admin.
In the Excel report, the Excel Services authentication settings is set as "use authenticated user's account". This wortks fine in the DEV environment.
Concerning SecureStore, PowerPivot Configurator has configured it the PowerPivotUnnattendedAccount application ID in all the environments. There is
NO configuration of an Application ID for Excel Services in any of the environments (Dev, test or production). Altough I reckon this is where the solution lies, I am not 100% sure as to why it fails in test and prod. But as I read what I am
writing, I reckon this is because of the authentication "hops" through servers. Am I right in my assumption?
Could someone please advise what am I doing wrong in this case? If it is the fact that I am missing an Secure Store entry for Excel Services, I am wondering if someone could advise me on how to set ip up? My confusion is around the "Target Application
Type" setting.
Thank you for your time.
Regards,
P.

Hi Rameshwar,
PowerPivot workbooks contain embedded data connections. To support workbook interaction through slicers and filters, Excel Services must be configured to allow external data access through embedded connection information. External data access is required
for retrieving PowerPivot data that is loaded on PowerPivot servers in the farm. Please refer to the steps below to solve this issue:
In Central Administration, in Application Management, click Manage service applications.
Click Excel Services Application.
Click Trusted File Location.
Click http:// or the location you want to configure.
In External Data, in Allow External Data, click Trusted data connection libraries and embedded.
Click OK.
For more information, please see:
Create a trusted location for PowerPivot sites in Central Administration:
http://msdn.microsoft.com/en-us/library/ee637428.aspx
Another reason is Excel Services returns this error when you query PowerPivot data in an Excel workbook that is published to SharePoint, and the SharePoint environment does not have a PowerPivot for SharePoint server, or the SQL Server Analysis
Services (PowerPivot) service is stopped. Please check this document:
http://technet.microsoft.com/en-us/library/ff487858(v=sql.110).aspx
Finally, here is a good article regarding how to troubleshoot PowerPivot data refresh for your reference. Please see:
Troubleshooting PowerPivot Data Refresh:
http://social.technet.microsoft.com/wiki/contents/articles/3870.troubleshooting-powerpivot-data-refresh.aspx
Hope this helps.
Elvis Long
TechNet Community Support

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

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

SSAS Tabular - Adding Column to a table gives error "Object reference not set to instance of object"

If I make changes to a table in SSAS Tabular Visual Studio, the newly added column gives error as "Object
reference not set to instance of object"

Hi VikasJain13,
According to your description, you get the "Object reference not set to instance of object" error when adding columns in Tabular. Right?
Generally, it throws this error when the internal code is accessing the property of an empty object. As you mentioned it happens when you make changes on a table, mostly it means that table is already a empty object. Please re-process your tabular to see
if this table is still existing.
If you have any question, please feel free to ask.
Simon Hou
TechNet Community Support

Related column of a fact table - SSAS Tabular

Hi,
I'm developing a SSAS Tabular model using a SQL Server 2012 SP 1 installation.
For a fact table I've created some calculated columns using the DAX RELATED function. These columns not are hidden to client tools. When I deploy the project and I open an Excel workbook in order to connect the SSAS Tabular cube, in the field list I cannot
see the calculated columns by RELATED function.
For me, this in an issue and not a normal behaviour.
Any suggests to me, please? Many thanks

Hi Pscorca,
Generally, if we create a calculated column on SQL Server tabular model database on SSMS, and then go to Model-> Process -> Process All and finish the data processing. Then when we connect the database in EXCEL, the calculated column will appear on
the Excel. In your scenario, you cannot see the calculated columns. It’s strange behavior. However we cannot give you the detail reason for this issue base on the limited information. Please refer to the link below which describe the detail steps about
create a calculated column, then check whether if you missing any step when creating calculated column.
Add Calculated Column and Measures to Tabular Model
If the issue persists, please elaborate your production environment and the steps to create the calculated column, so that we can make further analysis.
Regards,
Charlie Liao
TechNet Community Support

Improving SSAS Tabular processing performances

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