Dimensional table exceeds ?

hi friends,
what is the rule for dimension and fact table?
is there any condition like deminsion table >15% of fact table. if the dimension table exceeds the fact table what can i do. how can i eliminate this effect.what scenerio we will get all this type of situations.
Thanking u
suneel./

Hi,
We should define as many dimensions as possible and we have to take care that no single dimension crosses more than 20% of the fact table size.
High cardinality: This means that the dimension is to have a large number of instances (that is, a high cardinality). This information is used to carry out optimizations on a physical level in depending on the database platform. Different index types are used than is normally the case.
A general rule is that a dimension has a high cardinality when the number of dimension entries is at least 20% of the fact table entries. If you are unsure, do not select a dimension having high cardinality. In other words it means the number of unique combination of values in an infocube dimension is very high. One of the reasons for this is the grouping of characteristics that are not related in one dimension.
Hope this helps.
PB

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I am working with a database and the toolkit "the database connectivity tooset". I know how to create a new table from labview, but is it possible to create a "two dimensional" table from labview, i.e, where one table in Microsoft Access is linked to another one. I know how to do it in access, but it should be possible in program to crate a new table and this one has to be linked to another one then, just like the others. Does someone know how to do it??
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Hi
I assume you are not so familiar with databases, are you?
First I want to comment your previous post:
well I have a table for a product that contains, say different data for the product, i.e. the date of the test, who is responsible for the test, where it was performed. Also, linked to the date (I guess it is the primary key), there are also some data related. so in my table in the database, next to the date, there is a "+"-sign, so I can open up the page of all the data related to the date.
Well, did you create this database on your own? So you must have created two tables (table one with fields Datum, Responsible & Cost and table two with fields Place1, Place2, Place3 & Place4). Then you must have dragged on field from one table to another field in the other table in the "Relations" view of access. Doing so, you created a relation. Due to this, access now knows how this date is related and displays the "+"-sign. You can not assume that the date is the primary key.
In fact you do not have a "2D" table, but just different datasets from two tables connected to each other. This connection is created by relations.
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Thomas
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Don't be afraid to rate a good answer...

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Hi
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Try limiting the resultset or upgrade the [MaxVisiblePages]
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regards
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http://obiee101.blogspot.com

About Fact and Dimensional tables

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You have three ways to deal with this:
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Odbc driver returned an error (SQLExecDirectW).
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Anyone?

How to join 2 star schemas using a Dimensional table( like Bridge Table)

How to join 2 star schemas using a Dimensional table( like Bridge Table) in OBIEE?

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hi friends,
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regards
suneel.

hi Suneel,
it's another topic, to improve query performance, we evaluate if aggregate help or not, to justify we use bw statistic or ST03N, where summarization ratio is > 10;
the summarization ratio = number of record read from database / number of record transferred,
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check
SAP BW Query Performance Tuning with Aggregates
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/3f66ba90-0201-0010-ac8d-b61d8fd9abe9
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Srikanth
http://bintelligencegroup.wordpress.com

Query is not running after one table exceeds certain records, any limit?

I have a production database and a reporting database. Production is on version 9.2.0.5 where as Reporting is on 9.2.0.3. I had a query which uses Gl table which grows every month. The query use to take almost same time both in Production as well as Reporting. After the table grew in last couple of months. I observed the query just hangs up in production where as it continues to run in Reporting. Is it the orcale version which makes any difference for the query not to run in prodcution when Gl table had 27 million rows as against 25 million rows a couple of months of ago? Any help is appreciated.

user5846372 wrote:
If I use the gl table which was populated until two months ago having less than say 25.2 million rows, the query runs in 2 minutes. If I use the current gl table having current data (total of say 27 million rows) then the query does not even run. From the current gl table if I delete about 2 million records making it 25 illkion rows then the query runs. So I was wondering whether it is the oracle version which makes this difference.Explain your logic that says that after the queries run successfully on different versions, the version difference is now somehow causing the problem - and not the fact that what did change since the last successful run was the the data volumes....
As for "+the query does not even run+" - it does. Simply that you do not have a clue what it is doing and thus no means to diagnose the problem. And then jump to the conclusion that the version difference is somehow to blame.
WHAT is that query doing when it seems to "hang"? (it very likely does not hang at all, and is simply very busy with I/O or being blocked from accessing a resource it needs)
Have you looked at the events and wait states of the query? Have you looked, as Daniel already suggested, at the execution plan?
You cannot and should not attempt to diagnose a problem, without understanding the problem. If you have no idea what the problem is, how can you simply jump to the conclusion that "+oh, it must be the version difference+"!?
You can only solve a problem by understanding it. It is that simple. So first understand what the query is doing and why it seems to hang BEFORE you attempt to diagnose and solve it.

Are there any (dis)advantages in building a universe on fully normalized tables instead of building dimensional model/tables and then universe on top of them?

Hello,
I’m hoping someone can help me with understanding advantages and disadvantages if we want to build a universe on top of a fully normalized tables, compared to using a dimensional model with star schemas.
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Can you point me to some established best practices regarding using normalized tables to build a universe? Any documents with some examples for this?
Any expected difficulties during design/development phase of our universe, related to using normalized tables?
Any expected performance degradation if we use normalized tables compared to using dimensional tables?
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I’m using BOE XI 3.1, tables are in Oracle 11.2.
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Few Disadvantages that I usually face when building universe on Normalized tables,
1. Performance - Read operations have to suffer because indexing strategies do not go well with table joins
2. Derived Tables - Due to complex Queries/ Logic, most of the time, end-up creating derived tables, which doesn't use back-end table indexes and slows down the report runtime.
3. Normalized table/ Transaction tables may not always have proper cardinality and often results in Cartesian products
4. Normalized tables may not have tight referential integrity and may have to join more than one column and join on varchar, etc whereas, good Dimensional model datawarehouse will have proper keys/ integer joins and not always necessary to join on multiple fields
5. Often deal with Fan and Chasm Traps
6. Dealing with Database fields with nulls, blanks, date in numeric format, etc.,
7. No Facts, Dimensions separated and most of the time they are in same table
and More...
If performance is not a matter and building Datawarehouse is a big deal, then I will start building Universe on normalized tables by having the database diagram as reference for Joins, contexts, etc
Note: After dealing with universes based on normalized tables for few years (by creating views, complex sql queries data loading to tables and unv on these tables, derived tables), I ended up creating star-schema dimensional model (couple of months extra ETL work), users/ developers felt lot better when they have to create standard/ ad-hoc reports and they are super fast compared to previous universes.

How to repeat table header on each page of PDF using Coldfusion

Hi all,
Can anybody help me in resolving this issue. The details are mentioned below.
I am generating PDF using <cfdocument> tag of Cold Fusion.
I have a header and footer to be displayed on each page. I am rendering data in a table.
If rows in the table exceed a page , and continue on the next page , I want the table headers to be repeated on each of the page.
Example :
Currently this is happening:
Page Header
Sr No
Name
Occupation
1
A
A
2
B
B
3
C
C
Page Footer : Page No 1
Page Header
4
A
A
5
B
B
6
C
C
Page Footer : Page No 2
What I want is :
Page Header
Sr No
Name
Occupation
1
A
A
2
B
B
3
C
C
Page Footer : Page No 1
Page header
Sr No
Name
Occupation
4
A
A
5
B
B
6
C
C
Page Footer : Page No 2

Hi Dan ,
Thanks for your inputs.
This way wont work beacause , am displaying other text and table both, and the table will be diplayed based on some conditions. If the conditions are true , table will be diplayed , else not.
I missed to illustrate text in the example. The scenario is something like this :
Page Header
Text .........
Table [Displayed conditionaly]
Page Footer
Please suggest me some way to do this.

How to add the rows formatted as table headings, Tables headings are repeated when a table spans more than one page.

Hi all,
i am facing problem while generating Test Result word document after successful execution of TestStand.
The Problem is :
i want to add rows Formatted as table headings, table headings are repeated when a table spans more than one page(marked as Red).
Example:
Page No. 1
|     Test case Number | Test Step number      |
|      100                         |            100                   |
Page No. 2
|     Test case Number | Test Step number      |
|      200                         |            300                   |
Test Result word document should generate with Table headings(marked as Red) in every pages of the document, but i am not getting as per above example.
Please through light on this.
Regards,
Susa.

Hi Santiago,
Thank you very much for your valuable reply.
i want to generate MS-word report for TestStand after successful testing using MS-word2000.
Test report contains Actual values, Expected values and Pass/Fail status.
In my program i have customized all fields i can able to generate test report which contains Verification engineer name , test mode, test date, start time, end time Actual values, Expected values and Pass/Fail status.etc....
To put all values of test case number, Test step number, Actual values, Expected values and Pass/Fail status in to table for each time, i will
insert a row into table every time values arrives, once the table exceedes its page size it moves to the next page, next page should start with table row header but it start with values of above said parameters.
so i'm not able to repeat table row header for each page.
Please find the attached file for your reference.
Attched file expected.doc :   This file contains what i wanted to generate MS-word report. Here table row header "Test Case Number and Test Step Number " is repeated in second page.
Attached file Actual output from source code.doc   : This report generated from the source code. Here table row header "Test Case Number and Test Step Number" is not repeated in second page.
Do you know any property to set "repeat as header row at the top of each page" using MS-word ActiveX in CVI/Labwindows.
i think this information is sufficient for you,
Still if you need some information please ask me.
Thanks
Susa.
Attachments:
Actual output from source code.doc ‏25 KB
expected.doc ‏26 KB

Dimensional table exceeds ?

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