Analysis :: Cube Extracting Data From Physical Or Logical Star Schema?
Oct 22, 2015
We have an OLTP database and operational reporting is carried out on a replica server / database. We have plans to build a new data warehouse and an analysis services cube.
Question 1:Should a cube be designed to extract data from a physical star schema rather than a logical one (3NF relational (ODS?) using a data source view to derive the star)? I'm guessing for performance it's better to pull data from similar structures (physical facts and dimensions as required by analysis services) but is the difference significant?
Question 2:Depending on the answer to q1, is it bad practice to ETL data from a staging database (replica > staging) directly to a star schema (multiple data sources and cleansing / business rules required)? Or should it be processed from staging to an ods and only then to a star schema (physical or logical). I still don't know if an ODS is required but I guess the consideration for this decision is whether the business would require daily operational (or ad hoc) reporting on the consolidated data sources (without needing historical DW functionality).
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Dec 27, 2004
Hi,
I have tried the following out and would appreciate feedback from experienced users regarding if the following is a good/bad approach:
After bring all the data in my Data Mart, I have created a view which has all the data in a big flat table (totally unnormalized). Then based on this BIG FLAT UNNORMALIZED VIEW :) I have created my various dimensions using the 1st option i.e. Star Schema.
Based on the little testing that I have done, I seem to be getting the correct results across various dimensions... However, can someone kindly comment on this approach and the pros/cons.
Thanks
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Dec 18, 2002
does any one know how to built a star schema by DTS:confused:
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May 19, 2008
hi we are in the process of developing a project and we r at the initial phase i.e. at the analysis phase and we have been discusssing on what is physical and logical database design. can any body send any links or articals on this will be hightly appreciated.
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Sep 12, 2005
What is the difference between the logical database schema and the physical database schema?
Thanks!
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Jun 16, 2003
Does anyone have any recommendation on whether it's better to monitor the average queue lenght for physical or logical drives? What about for a RAID set?
Just wondering,
thanks
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Aug 23, 2006
A database was set up as a test database and then the database name changed but the logical and physical filenames still have test in their name - obviously not a good idea. I have tried to change the physical file name but get the error message that the physical file name cannot be changed once the database has been created. I have also tried detaching the database and renaming the mdf and ldf files but these could not be re-attached so had to revert back to the original names.
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Jul 9, 2014
What is the difference between Logical Join and Physical Join and there Types?
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Apr 3, 2011
Is there a query or sp that I can pull all databases on the server along with their logical file names and physical file names?
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Aug 7, 2015
I want to implement population data in sales cube.
Fact table has customer code which is foreign key of Customer master dimension which in turn is linked to census data dimension. Census data dimension have city wise population data having foreign keys of zone and state.
We want to add population data in fact table.
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Aug 4, 2015
I've
1. SQL Server Data Warehouse
2. OLAP CUBE in Analysis Services
My question is - If my SQL Server Data Warehouse is changed (Having Append Data) - Is that My OLAP Cube will have the Append Data?
It's possible, my OLAP Cube always having Append Data if my Data Warehouse is changed? If yes, how to do it without re-deploy and re-process my Analysis Services Project.
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Aug 21, 2015
So I use Excel 2010 connect to a cube I have built. Then I change some values in the cube via my ETL and re-process the cube. Then I verify that record is NOT there in the fact table - check!
However, when I refresh the worksheet where the pivot table is pulling data from the cube, but that old record wont go away!
Just realized my cube data source on the dev server, was in fact still configured with my local workstation name. Once I updated that, processed the cube all was well.
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Nov 9, 2015
in cube we have one role defined. users in that cube should be allowed to see only last 2 days of data. I mean they should be able to browse only last 2 days of data based on current date. How to implement?
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Jun 5, 2015
I am looking for some Simple/Best Data Visualization tools for Desktop which accept data from SSAS Cubes.
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Oct 2, 2015
Is there any way to copy my Data of 2015 to the Planning/Forecasting Value of 2016?
My question is based on that we use INFOR ION BI right now and there we can just add an Button in our reports wich physically copies the value from one year to the next year based on some other rules in the cube.
Now I need to make this example work with SSAS and Excel PivotTables but I cant figure out how.
I have absolutely no clue where and how to accomplish it. Do I use Calculations, do I use Actions, do i make it in the Dataview, Cube or directly in Excel?
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May 19, 2015
I have problems creating a cube with AMO.
I can add the cube to the database object and fill it with dimensions and a measuregroup (see code below).
If I call cube.Update() it says something like "Error in meta data manager. Cube has no measuregroups." (getting the message in german language)
The error in Microsoft.AnalysisServices.OperationException.Results.Messages is -1055653629
I can't find any documentation about this (or any other) error code in Microsoft documentation.
Here's my Code:
Cube newCube = database.Cubes.Add("MyCube","MyCube");
newCube.Language = 1031;
newCube.Collation = "Latin1_General_CI_AS";
CubeDimension dim = newCube.Dimensions.Add("dim1","dim1","dim1");
CubeAttribute attrib = dim.Attributes.Find("dim1Attr1");
[code]....
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Nov 25, 2015
I am facing a very weird issue in our SSAS database. We have several roles with 'Read definition' access. None of these roles are able to see data in the cubes. I have checked these roles over and over and there is no problem with the definition. Each of the roles have been given read access to Data Source, Cube and Dimensions.
The users are able to access the definition and structure of the cube i.e. they can see the measures & dimensions available but when they drag measures and dimension attributes in the browser (SSMS) OR execute an MDX - they get null values. The roles with 'Full Control (administrator)' access are able to see all the data without any issues.
I have tried the following:
1. Deleted all roles and re-created.
2. Created roles directly on SSAS DB.
3. Deployed all objects and processed the DB.
Each time only the admins are able to see the data.
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Aug 26, 2015
I created SSAS cube in VS 2008 and have been able to deploy it successfully to the server. While creating the cube I was able to browse dimensions and all underlying tables just to make sure it has data. After deploying successfully when I drag and drop any measure group to browser it does not display anything.
The only thing I did different from straightforward cube building process was that when I created those measure groups the partitions that were created by default were giving me some unknown errors so I had to delete them in order for cube to process successfully.
Did that made any difference because I thought partitions are for improving query performance and has nothing to do with cube processing errors.
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Nov 16, 2007
I am cutting my teeth on star schema design. I have a simple star schema I am building for Headounct analysis at work. I have a factless fact table where a row represents a head in the company. Each head is toed to a particulat week in a Date dimension tabel. There are additional dimensions for things like gender, ethnicity, marital status, age, etc. Now in my department dimension - it's hierarchical. In the DimDepartmnet there is a department which belongs to a company. Comapnies belong to divisions. Now the fun part. Each division has a headcount target for each year. Up to this point I am in a perfect star schema (no snow flaking). How would I integrate in this concept of a headcount target for each division for a given year?
We are using cognos on top of this star schema to provide reporting and analysis services if that is relevant. From the Star Schema design stand point... any thoughts?
Christian Loris
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May 13, 2014
I have a cube that we are processing nightly via an Analysis Service Processing Task in SSIS. In order to increase the performance of the processing time, we elected to use a lot of rigid dimension attributes, and do a full process of everything in the SSIS task. The issue that I am having is that after that task completes, I need to go into Visual Studio to deploy the cube becuase we are unable to browse or use the cube. This issue seemed to start once we changed the SSIS Analysis Service Processing Task to do a full process on the dimensions, rather than an incremental.
I would expect that once development is done, and it is processed and deployed, that is it. My thinking is that the SSIS task should just update the already deployed cube,
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Jun 29, 2012
I wanted to know that when I create a table using SQL Server, does the table metadata like schemaname and catalogname is stored in memory or in hard-disc. I am trying to extract schemaname and catalogname when the database is down or correctly when I have no connection string. I know about sysindexes, systables etc, but i am not able to understand whether it stores the data which is useful to me like catalogname.
sql query to extract the column names from sysindexes?
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Apr 24, 2015
I am trying to configure the reporting for TFS using SQL Server. But I get following error when viewing any report:
So I try to manually process the cube to check if it works. I am following this article: [URL] ....
When I click on GetProcessingStatus and invoke it (with last field set as TRUE) I get following error:
How to resolve this issue and be able to see the reports.
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Nov 5, 2006
Can someone please explain this statement: At the logical level where there can be any number of entities in a relationship while physically you define relationships between two tables.
thx,
Kat
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Jan 19, 2007
Hi all,
Our star schema design has one fact table and 3 dimensions.
The FK's in the fact do not necessarily make up the primary key. So I have an identifier in the fact table as PK. Here is my index assignment:
Fact Table - Clustered Index on PK
Non Clustered Index 1 on FK1
Non Clustered Index 2 on FK2
Non Clustered Index 3 on FK3
Each Dimension Table - Clustered Index on PK
Non Clustered Index on Attribute. This is the attribute that will be used in reports / cubes.
Is the above design good to start with?
Thanks,
V
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Feb 7, 2008
Hi,
I was talking to my boss to day and our report request are not very consistant. We always having someone coming back to change something in our report. We were thinking of useing something called the Cube Analysis. Then it give our employees the raw data for them to run any standard query for themself. We have folks that want a report one way, but then they changed their minds and we are creating yet another report 4 or 5 times. what are your thoughts about this type of database?
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Jun 21, 2007
I'm making my first attempt at creating a cube using Analysis Services based on my exisiting datamart. Datasource, views, and dimensions have been defined. But comes deploying the cube, it's giving the error saying "A connection cannot be made. Ensure that the server is running." The Deploy Target server and database are the same where my datamart is. Or, maybe I don't know what I'm doing.
Would appreciate any suggestion for my enlightenment. Thanks
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Jun 30, 2007
I setup Hiarchy in the dimentions of my cube, however when I go and look at it via proclarity, I can't see the hiearchy there.
I have one table that has:
Category
Subcategory
Partnumber
And I have the hiearchy set from Subcategory to partnumber.
Then I go into proclarity and limit the category by "my catname" and I still see the 8000 partnumbers in the list.
Any ideas?
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Jul 20, 2005
I have a (hopefully typical) problem when it comes to cube design. Westore millions of product records every year, broken down bymonth/quarter. Each product can be assigned to various heirarchialclassification groups etc. The data in an OLTP DB occupies roughly100G for a typical year.We're looking at breaking this out into OLAP to provide faster accessto the data in various configurations and groupings. This is not aproblem, as this is the intended use for Analysis Services.The problem is that we apply projection factors on the product pricesand quantities. This would be ok if it only happened once, however,this happens every quarter (don't ask why). The projection factorschange 4 times a year, and they affect all historical product records.This presents a challenge because to aggregate the data into a usefulconfiguration in the cubes, you throw out the detail data, but thismeans throwing out the price and quantities which are needed to applythe projection.So if you have Product A at $10 and Product B at $20, and roll both upinto Category X, you'll have $30, but you'll lose the ability to applya projection factor of .5 to Product A and .78 to Product B. They'rerolled up.I don't want to regenerate the cubes every 3 months. That's absurd.But we can't live without the ability of projection theprices/quantities on a product level (detail level). So how can thisbe achieved when the other cubes are created at a higher level withless details and sums of the detail data?My initial guess is that we have to update the product data, and thenreaggregate all the other data that is built upon that product data.Is there any other way to apply math to the data on the way out?Thanks in advance!Regards,Zach
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May 6, 2015
i want to create cube withe 2 fact tables. is it possible?? if it is could you show me how !!
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May 21, 2015
how can use this mdx script in the calculation part of a cube, will i simply dump it in the script form by starting with the 'create member current cube.
[measures].[test]'
select
[measures].[abc] on 0,
[xyz].[xyz].(&0):[xyz].[xyz].(&60) on 1
from
(
select
(tail([month].[month].[month].members,6))on 0
from
[cube])
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May 18, 2015
The data attached below is from a Fact table. When this data is browsed in the Cube the end user is only interested in value of Measure 1 when it is not equal to zero. Measure 1 is a base measure .how to suppress the value 0 for Measure 1 in the Cube.
DimesionKey1
DimensionKey2
DimensionKey3
Measure 1
Measure 2
Measure 3
[code]...
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Nov 23, 2015
I know where the data files are etc, but what is the physical structure of a cube like on disk?
Logically we see the data as a star. Is the physical file akin to a star also? Or is a single file a measure group containing all the required member and measure data - thereby eliminating the need for physical join operators.
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Oct 14, 2015
I am planning to implement the security in my cube..
Total sales is 1000..
Customer Sales
A 100
B 200
C 300
D 400
Total Sales 1000
When i want to give access to the customer A, he can capabule of viewing only A value 100... But the problem is A is able to see total sales 1000.. How can i restrict the sales a value to 100 in the cube.. Where i have to set the property to fix this issue.....
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