when can i use the STAR Schema and SNOWFLAKE Scgena
Answers were Sorted based on User's Feedback
Answer / subbu
for huge amount of data snowflake schema is the best.and
for less amount of star schema is better
Is This Answer Correct ? | 8 Yes | 2 No |
Answer / saptashaw
Star is better for performance.
Snowflake happens when one or more dimension tables in the
Star are normalized. This is done when there is sparsity in
the concerned dimensions.
Is This Answer Correct ? | 3 Yes | 0 No |
Answer / satya/gunu(satyabadi)
=>
-Star schema is highly denormalized.
-Snowflake schema is normalized.
=>
-As star schema is denormalized, the size of DWH will be larger than that of Snowflake schema.
=>
-Performance wise, star schema is good.
-But if memory utilization is a major concern,then snow flake schema is better than star schema.
=>.. In addition, Generally in real time, we use Snowflake schema only.
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / khushbu
snowflake is normalized model there for it require less storage space.
but star schema is not normalized. it has redundant data therefore require more storage.
Is This Answer Correct ? | 1 Yes | 5 No |
When we use consume in cognos?
What is defined as Query studio?
Can you explain new content durability?
What is slowely changing dimensions?why we are used SCD?
-------What are the Adv of Star Schema and Snow Flake Schema?
Part 1 : Cognos 1.What are the technologies that are used in cognos? 2.What are complex reports? 3.What is page break? 4.What is layout component? 5.How do you use extract function? 6.What is the use of Crosstab space? 7.What is Rank()? 8.What is the use of Query calculation and layout calculation? 9.What is Slicer and Dicer? 10.How can you create users in Cognos? 11.What is last child member? 12.What is the use of Conditional blocks? 13.What is Conditional Formatting? 14.What is group span? 15.In which types of reports does the page breaks applicable? Is it applicable in excel reports? 16.I want to show a up arrow and down arrow image in cross tab report, if the revenue is > 5000 (up arrow) and if <5000 (down arrow)? How will you achieve this? 17.What are types of Filters in RS? What is Summary Filter and Detail Filter? 18.What is Cast Function? 19.How will you create prompts for the example like this : In a single report I want a) List report (Need a prompt for this) b) Crosstab report (Need a separate prompt for this) c) Chart ()(Need a separate prompt for this) Part II : Framework Manager (FM) 1. What is Determinant in FM? 2. What is Cardinality? 3. What are the types of filters used in FM? 4. Can we create cubes with Relational Data sources? 5. What is Aliasing and Shortcut? 6. What is Session Parameter & Parameter Maps? 7. How many types of securities that we have in FM? 8. What is Data Security in FM? Part III : Data warehousing 1.What are various types of Schemas? 2.What is Star Schema and Snow Flow Schema? Difference between both? 3.What is surrogate key? Part IV : Databases 1.What are NVL Functions? 2.What is left outer join? Give an Example? 3.Can we straightaway use the tables that we have in the database instead of creating the package’s FM and making use of them, through Report Studio (RS)?
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