October 11, 2018

Sreekanth B

Pegasystems Most Frequently Asked Latest SSAS Interview Questions Answers

What is regular type, no relation type, fact type, referenced type, many-to-many type with example?

No relationship: The dimension and measure group are not related.

Regular: The dimension table is joined directly to the fact table.

Referenced: The dimension table is joined to an intermediate table, which in turn,is joined to the fact table.

Many to many:The dimension table is to an intermediate fact table,the intermediate fact table is joined , in turn, to an intermediate dimension table to which the fact table is joined.

Data mining:The target dimension is based on a mining model built from the source dimension. The source dimension must also be included in the cube.

Fact table: The dimension table is the fact table.

 What are calculated members and what is its use?

Calculations are item in the cube that are eveluated at runtime

Calculated members: You can create customized measures or dimension members, called calculated members, by combining cube data, arithmetic operators, numbers, and/or functions.

Example: You can create a calculated member called Marks that converts dollars to marks by multiplying an existing dollar measure by a conversion rate. Marks can then be displayed to end users in a separate row or column. Calculated member definitions are stored, but their values exist only in memory. In the preceding example, values in marks are displayed to end users but are not stored as cube data.
Pegasystems Most Frequently Asked Latest SSAS Interview Questions Answers
Pegasystems Most Frequently Asked Latest SSAS Interview Questions Answers

 What are KPIs and what is its use?

In Analysis Services, a KPI is a collection of calculations that are associated with a measure group in a cube that are used to evaluate business success. We use KPI to see the business at the particular point, this is represents with some graphical items such as traffic signals,ganze etc

What are actions, how many types of actions are there, explain with example?

Actions are powerful way of extending the value of SSAS cubes for the end user. They can click on a cube or portion of a cube to start an application with the selected item as a parameter, or to retrieve information about the selected item.

One of the objects supported by a SQL Server Analysis Services cube is the action. An action is an event that a user can initiate when accessing cube data. The event can take a number of forms. For example, a user might be able to view a Reporting Services report, open a Web page, or drill through to detailed information related to the cube data

Analysis Services supports three types of actions..

Report action: Report action Returns a Reporting Services report that is associated with the cube data on which the action is based.

Drill through: Drillthrough Returns a result set that provides detailed information related to the cube data on which the action is based.

Standard: Standard has five action subtypes that are based on the specified cube data.

Dataset: Returns a mutlidimensional dataset.

Proprietary: Returns a string that can be interpreted by a client application.

Rowset: Returns a tabular rowset.

Statement: Returns a command string that can be run by a client application.

URL:  Returns a URL that can be opened by a client application, usually a browser.

What is partition, how will you implement it?

You can use the Partition Wizard to define partitions for a measure group in a cube. By default, a single partition is defined for each measure group in a cube. Access and processing performance, however, can degrade for large partitions. By creating multiple partitions, each containing a portion of the data for a measure group, you can improve the access and processing performance for that measure group.

What is the minimum and maximum number of partitions required for a measure group?

In 2005 a MAX of 2000 partitions can be created per measure group and that limit is lifted in later versions.

In any version the MINIMUM is ONE Partition per measure group.

What are confirmed dimensions, junk dimension and degenerated dimensions?

Confirm dimension: It is the dimension which is sharable across the multiple facts or data model. This is also called as Role Playing Dimensions.

junk dimension: A number of very small dimensions might be lumped (a small irregularly shaped) together to form a single dimension, a junk dimension – the attributes are not closely related. Grouping of Random flags and text Attributes in a dimension and moving them to a separate sub dimension is known as junk dimension.

Degenerated dimension: In this degenerate dimension contains their values in fact table and the dimension id not available in dimension table. Degenerated Dimension is a dimension key without corresponding dimension.

Example: In the PointOfSale Transaction Fact table, we have:

Date Key (FK), Product Key (FK), Store Key (FK), Promotion Key (FP), and POS Transaction Number

Date Dimension corresponds to Date Key, Production Dimension corresponds to Production Key. In a traditional parent-child database, POS Transactional Number would be the key to the transaction header record that contains all the info valid for the transaction as a whole, such as the transaction date and store identifier. But in this dimensional model, we have already extracted this info into other dimension. Therefore, POS Transaction Number looks like a dimension key in the fact table but does not have the corresponding dimension table.

What are the types of database schema?

They are 3 types of database schema they are

Star
Snowflake
Starflake

What are the difference between data mart and data warehouse?

Datawarehouse is complete data where as Data mart is Subset of the same.

Ex:

All the organisation data may related to finance department, HR, banking dept are stored in data warehouse where as in data mart only finance data or HR department data will be stored. So data warehouse is a collection of different data marts.

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