In General What is are Dimentional and fact tables

Hi
In General What is are Dimentional and fact tables.
What are the differences between
Data Warehouse, Data Mart, Data Mining, OLAP
if possible Pl give definations also for above.
thanks

Please refer to www.ralphkimball.com

Similar Messages

What exactly are unscaledWidth and unscaledHeight in mobile item renderers?

Hello,
What exactly are unscaledWidth and unscaledHeight that get passed to the measure() method for a mobile item renderer?
I am guessing renderers start at "default" width and height (so unscaled) which get scaled based on DPI. Is that it?
Thank you.

measure() doesn't take any parameters so I assume you mean the layoutContents() and/or drawBackground() methods.
If you look at the code in LabelItemRenderer (and MobileSkin) for updateDisplayList() you'll see that it just delegates the work to the drawBackground() and layoutContents() methods:
    override protected function updateDisplayList(unscaledWidth:Number,
                                                  unscaledHeight:Number):void
        // clear the graphics before calling super.updateDisplayList()
        graphics.clear();
        super.updateDisplayList(unscaledWidth, unscaledHeight);
        drawBackground(unscaledWidth, unscaledHeight);
        layoutContents(unscaledWidth, unscaledHeight);
This was done to make it a little bit easier for people to subclass LabelItemRenderer/IconItemRenderer by breaking the positioning logic apart from drawing the background visuals. Check out the documentation for UIComponent.updateDisplayList and look around on Google for more information on how updateDisplayList fits into the Flex component life cycle.

How to know what reports are running by looking at SSReproting Services to see what reports are running and also any clue of which application is using the reporting services?

How to know what reports are running by looking at SSReproting Services to see what reports are running and also any clue of which application is using the reporting services?

To see what reports are running, take a look at the execution log views that are available in the database. Which views that are available are dependent on your version of SSRS.
http://technet.microsoft.com/en-us/library/ms159110.aspx
To see which application is using SSRS is a little more difficult. You can turn HTTP logging on, which will give you an idea of where connections are coming from, so you can see IP addresses. You can also look at the execution log view to see
user accounts. So, depending on your environment and use of service accounts, this could be easy, or difficult.
http://technet.microsoft.com/en-us/library/bb630443.aspx
If all else fails you can look for clues in the SSRS logs. Good luck...

What is the difference between infocube and fact table?

hi bw gurus,
what is the difference between infocube and fact table?
thanks in advance
bye

Fact table contains only KeyFigures and foreign keys of dim ids.
Infocube conatin fact table sorrounded by dimension tables.dimension table contain primary keys of dim ids and SIDs which link to master data.
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/6ce7b0a4-0b01-0010-52ac-a6e813c35a84

What are logistics and setup tables?

Hi,
What are logistics and setup tables?? How are these two related?
Regards,
Sneh

Hi,
Logistics is the management of the flow of goods, information and other resources, including energy and people, between the point of origin and the point of consumption in order to meet the requirements of consumers (frequently, and originally, military organizations). Logistics involves the integration of information, transportation, inventory, warehousing, material-handling, and packaging, and occasionally security. Logistics is a channel of the supply chain which adds the value of time and place utility.
setup tables- are used to full the data for logistic applications.setup table are used for initialization and full loads.As there will be large number of data for logistic application first it will be fetched into setup tables then from there it will be used for initialization and full loads.
Regards,
Ravi

HT204370 Hi like the music store how to I get to see what movies are available and where ?

Hi like the music store how to I get to see what movies are available and where ?

iTunes Store: Which types of items can I buy in my country?

Foreign keys in SCD2 dimensions and fact tables in data warehouse

Hello.
I have datawarehouse in snowflake schema. All dimensions are SCD2, the columns are like that:
ID (PK) SID NAME ... START_DATE END_DATE IS_ACTUAL
1 1 XXX 01.01.2000 01.01.2002 0
2 1 YYX 02.01.2002 01.01.2004 1
3 2 SYX 02.01.2002 1
4 3 AYX 02.01.2002 01.01.2004 0
5 3 YYZ 02.01.2004 1
On this table there are relations from other dimension and fact table.
Need I create foreign keys for relation?
And if I do, on what columns? SID (serial ID) is not unique. If I create on ID, I have to get SID and actual row in any query.

>
I have datawarehouse in snowflake schema. All dimensions are SCD2, the columns are like that:
ID (PK) SID NAME ... START_DATE END_DATE IS_ACTUAL
1 1 XXX 01.01.2000 01.01.2002 0
2 1 YYX 02.01.2002 01.01.2004 1
3 2 SYX 02.01.2002 1
4 3 AYX 02.01.2002 01.01.2004 0
5 3 YYZ 02.01.2004 1
On this table there are relations from other dimension and fact table.
Need I create foreign keys for relation?
>
Are you still designing your system? Why did you choose NOT to use a Star schema? Star schema's are simpler and have some performance benefits over snowflakes. Although there may be some data redundancy that is usually not an issue for data warehouse systems since any DML is usually well-managed and normalization is often sacrificed for better performance.
Only YOU can determine what foreign keys you need. Generally you will create foreign keys between any child table and its parent table and those need to be created on a primary key or unique key value.
>
And if I do, on what columns? SID (serial ID) is not unique. If I create on ID, I have to get SID and actual row in any query.
>
I have no idea what that means. There isn't any way to tell from just the DDL for one dimension table that you provided.
It is not clear if you are saying that your fact table will have a direct relationship to the star-flake dimension tables or only link to them through the top-level dimensions.
Some types of snowflakes do nothing more than normalize a dimension table to eliminate redundancy. For those types the dimension table is, in a sense, a 'mini' fact table and the other normalized tables become its children. The fact table only has a relation to the main dimension table; any data needed from the dimensions 'child' tables is obtained by joining them to their 'parent'.
Other snowflake types have the main fact table having relations to one or more of the dimensions 'child' tables. That complicates the maintenance of the fact table since any change to the dimension 'child' table impacts the fact table also. It is not recommended to use that type of snowflake.
See the 'Snowflake Schemas' section of the Data Warehousing Guide
http://docs.oracle.com/cd/B28359_01/server.111/b28313/schemas.htm
>
Snowflake Schemas
The snowflake schema is a more complex data warehouse model than a star schema, and is a type of star schema. It is called a snowflake schema because the diagram of the schema resembles a snowflake.
Snowflake schemas normalize dimensions to eliminate redundancy. That is, the dimension data has been grouped into multiple tables instead of one large table. For example, a product dimension table in a star schema might be normalized into a products table, a product_category table, and a product_manufacturer table in a snowflake schema. While this saves space, it increases the number of dimension tables and requires more foreign key joins. The result is more complex queries and reduced query performance. Figure 19-3 presents a graphical representation of a snowflake schema.

Dimension table and fact table exists data physically

Hi experts,
can anyone plz tell me weather dimension table and fact table exists data physically or not/

Hi..Sudheer
SAPu2019s BW is based on "Enhanced Star schema" or "Info Cubes" database design.This database design has a central database table, known as u2018Fact Tableu2019 which is surrounded by associated dimension tables.
Fact table is surrounded by dimensional tables. Fact table is usually very large, that means it contains
millions to billions of records.
These dimension tables doesn't contain data it contain references to the pointer tables that point to the master data tables which in turn contain Master data objects such as customer, material and destination country stored in BW as Info objects. An InfoObjects can contain single field definitions such as transaction data or complex Customer Master Data that hold attributes, hierarchy and customer texts that are stored in their own tables.
SID is surrogate ID generated by the system. The SID tables are created when we create a master data IO. In SAP BW star schema, the distinction is made between two self contained areas: Infocube & master data tables/SID tables.
The master data doesn't reside in the satr schema but resides in separate tables which are shared across all the star schemas in SAP BW. A numer ID is generated which connects the dimension tables of the infocube to that of the master data tables.
The dimension tables contain the dim ID and SID of a particular IO. Using this SID the attributes and texts of an master data Io is accessed.
The SID table is connected to the associated master data tables via teh char key.
Fact table(Transaction data,DIM ID)<>Dimention Table(SID and Dim ID)<->Masterdata table(SID,IO)
Thanks,
Abha

What locks are required on a table when Oracle is processing an UPDATE

What locks are required on a table when Oracle is processing an
UPDATE statement?

Welcome to the forum!
Whenever you post provide your 4 digit Oracle version.
>
What locks are required on a table when Oracle is processing an
UPDATE statement?
>
Here is a relevant quote from the 'Lock Modes' section of the doc that Ed Stevens provided
>
Assume that a transaction uses a SELECT ... FOR UPDATE statement to select a single table row. The transaction acquires an exclusive row lock and a row share table lock. The row lock allows other sessions to modify any rows other than the locked row, while the table lock prevents sessions from altering the structure of the table. Thus, the database permits as many statements as possible to execute.
>
The above describes the locks when you, the user, tells Oracle to lock the row.

Improve Performance of Dimension and Fact table

Hi All,
Can any one explain me the steps how to improve performance of Dimension and Fact table.
Thanks in advace....
redd

Hi!
There is much to be said about performance in general, but I will try to answer your specific question regarding fact and dimension tables.
First of all try to compress as many requests as possible in the fact table and do that regularily.
Partition your compressed fact table physically based on for example 0CALMONTH. In the infocube maintenance, in the Extras menu, choose partitioning.
Partition your cube logically into several smaller cubes based on for example 0CALYEAR. Combine the cubes with a multiprovider.
Use constants on infocube level (Extras->Structure Specific Infoobject properties) and/or restrictions on specific cubes in your multiprovider queries if needed.
Create aggregates of subsets of your characteristics based on your query design. Use the debug option in RSRT to investigate which objects you need to include.
To investigate the size of the dimension tables, first use the test in transaction RSRV (Database Information about InfoProvider Tables). It will tell you the relative sizes of your dimensions in comparison to your fact table. Then go to transaction DB02 and conduct a detailed analysis on the large dimension tables. You can choose "table columns" in the detailed analysis screen to see the number of distinct values in each column (characteristic). You also need to understand the "business logic" behind these objects. The ones that have low cardinality, that is relate to each other shoule be located together. With this information at hand you can understand which objects contribute the most to the size of the dimension and separate the dimension.
Use line item dimension where applicable, but use the "high cardinality" option with extreme care.
Generate database statistics regularily using process chains or (if you use Oracle) schedule BRCONNECT runs using transaction DB13.
Good luck!
Kind Regards
Andreas

Dimension Table and Fact Tables

Hi,
Is there any way to see the Dimension Table contents and Fact Table Contents.
For eg:- I should be able to see the DIM ID and the SID's of a Dimension.

Well you can see them in SE11, by giving the table name.
Go to list schema and give the cube name. It will display all the table for that cube. Give the table name in SE11 or SE16 and see the content there.

Number of Entries in Dimension Tables and Fact Tables

Hi all,
is there an easy way to check
- the number of entries in the dimension tables
- the number of entries in the fact table?
Thanks a lot
Alex

Hi Alex,
If u want to see the content of Dimension table and Fact table for a infocube then just right click on a particular info cube then select manage . Select coneten tab there , form there u can either select Fact table to see the fact table conten or Infocube content to see the Dimensiontable content.
Regards..

Add Audit Columns to the Dimension and Fact tables (Created & modified date Time)

Hi All,
I am new to SSIS , I have to Add Audit Columns to the Dimension and Fact tables (Created & modified date Time) of the package.
Please let me know the best and easy way through which I can implement the same.
If possible suggest some real time example or link where I can find the same
Regards,
Vipin jha
Thankx & regards, Vipin jha MCP

You can simply use ALTER TABLE ADD.. syntax to add the columns if the tables already exist.
You can generate a single script for all tables using INFORMATION_SCHEMA.TABLES view
You can make then of NOT NULL type and set the default value to GETDATE()
In addition you can also have a Audit Trail trigger for UPDATE to make sure Modified date gets updated correctly on each update if not passed explicitly.
Please Mark This As Answer if it solved your issue
Please Mark This As Helpful if it helps to solve your issue
Visakh
My MSDN Page
My Personal Blog
My Facebook Page

Size of the DImension and Fact table.

Hi,
I have an info cube, now to decide weather i need to make use of line item or high cardinality .....i need to check or compare the size of the dimension table along with the size of the fact table.
Where do i get this information.
Please help.
Thanks,
Jay.

Hi Friend,
For each infocube you will see Rows and ratio for all the dimension tables and Fact table.
Rows indicate the number of rows in that Dimension or Fact table.
Ratio indicates the number of rows in that table divided by number of rows in the fact table.
As a standard the ratio of rows in Dimension table to rows in fact table should not be more than 10%.
If it is more than you will see it in red colour in this report and you can think of redesigning that particular dimension.
Regards
Hemant Khemani

Determine the size of Dim and Fact table

Hi,
Please some one tell me how do calculate the size of diminsion and fact table
Please explain me step by step.
Thanks

hi
We have two other ways also
Try RSRV test: Elementary > dataBase > DataBase Info about InfoProvide Tables
and You can check out in DB02 tcode Detail Analasys...
Thanks
Khaja

In General What is are Dimentional and fact tables

Similar Messages

Maybe you are looking for