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Friday, June 14, 2019

60 Top Cognos Interview Questions and Answers {Updated}

Cognos Interview Questions and Answers for experienced PDF, Read commonly asked Cognos Job Interview Questions with Answer PDF for Freshers.


Read Cognos Interview Questions and Answers

Why need a staging area database for DWH?
Staging area needs to clean operational data before loading into the data warehouse.
Cleaning in the sense your merging data which comes from a different source.

How can create users and permissions in Cognos?
in impromptu menu go to Catlog->User profiles -> userclass tab -> click on Creator ->u can give there folder access, table access, filters, Governor, etc
you can create users by using USERS PROFILE option……and you can give permissions using ROLE IN C8 and GOVERNERS in C7

What is drill down and slicing and dicing what's the difference between them?
Drilling lets you quickly move from one level of detail to another to explore different aspects of your business. Drilling down moves you down in the hierarchy; drilling up moves you up in the hierarchy.
Slicing and Dicing
While you can drill to look at the information at any level, you can slice and dice to select the exact information you want in your report.

What are the components of the report studio?
Insertable Objects pane > Properties pane > Explorer bar >Report Viewer

What is the difference between view and materialized view?
Views contain query whenever execute views it has read from the base table, Whereas M views loading or replicated takes place only once which gives you better query performance.

What is slowly changing dimension?
Dimension attribute values may change constantly over time. (Say for example customer dimension has customer_id, name, and address) customer address may change over time.

What is Cognos Visualizer and Cognos Scripting?
Visualizer is a representation of data cubes in a dashboard format. We can drill through to the ground level of a hierarchy as like in power play report but cannot add or remove fields dynamically.
Cognos script editor: We can write Cognos macros or programs in this tool and can fine tune or process some execution.

What is the difference between a cascading report and drill-thru report? why do we go for a drill thru report?
Cascading report works based on the condition but drills thru work based on the data item what we select as a drill thru options

What is Snap Shot? Snapshot is a static data source it is a picture of the report once u created a snapshot report u can’t add a data item.

What is the difference between a data mart and a data warehouse?
A data mart designed for a particular line of business, such as sales, marketing, or finance.
Whereas data warehouse is enterprise-wide/organizational
The data flow of data warehouse depending on the approach.

What is the difference between primary key and unique key constraints?
Primary key maintains uniqueness and not null values Where as unique constrains maintain unique values and null values.

What is a catalog and types of catalogs in Cognos and which is better?
A catalog is a file containing the information (Database tables) that Impromptu users need to create reports.
  • personal
  • distributed
  • shared
  • secured
the shared catalog is better.

What is Cognos Powerhouse and what is it used for?
Cognos Powerhouse is High-Productivity Application Development Solutions equips you with high-productivity development environments for creating your data-driven business solutions faster, whether for Web-based, client/server, or traditional terminal-based access. PowerHouse has gained a worldwide reputation for productivity, reliability, performance, and flexibility.

How do you define a cube?
Its a multidimensional view of dimension and measures. It is used to analyze the data in various aspects, which is called slicing and dicing.

What is DTM?
DTM transform data received from reader buffer and its moves transformation to transformation on row by row basis and it uses transformation caches when necessary.

What are the types of index?
Bitmap index, B-tree index, Function-based index, reverse key and composite index. We used Bitmap index in our project for better performance.

How do add dynamic titles in PP?
PowerplayFrom format menu–>title, header & footer–>title–>insert report filename

What is Cognos Reporting tool?
Cognos is a Reporting tool from IBM which helps in reporting and analysis of various data from a data warehouse. 

What is the Difference between PowerPlay transformer and power play reports?
Powerplay transformer’ is a ‘MOLAP’ tool using which one can create a multidimensional structure called “CUBE”.
Powerplay for reports is used to generate a report from the cube. Only one report can be generated from one cube. If u want ‘n’ reports u must create ‘n’ cubes.

What are the different uses of a repository manager?
Repository manager used to create a repository which contains metadata the Informatica uses to transform data from source to target. And also it uses to create Informatica user’s and folders and copy, backup and restore the repository.

What you mean by Drill across and what is the difference between drill through, drill across? Drill across means when you are moving from one report to another report as a country in one report and States in another Report whereas if the report is using the same report from moving from country to state. In other when you are moving details level if you are using the different report it is drill across and if you are using the same report it is drill through.

What is Cognos Connection?
It is a Web portal for Cognos 8 and a component which interacts with the Content Store. It is a frontend to publish, find, manage, organize, and view an organization’s business intelligence data.

What is cube size?
2.0 GB depends on ur project requirements.

What is a folder?
Folder contains repository objects such as sources, targets, mappings, a transformation which helps logically organize our data warehouse.

What is the loop in framework manager?
Loop: the loop is a closed path (relation) that exists among 3 (or) more tables. For example, if we have ‘3’ tables T1, T2, T3 then, a loop exists among these tables only when we create joins in the following fashion:
Loop: T1 —> T2 —> T3 —> T1
To resolve the above problem, we have to create a shortcut (or) Alias to Table T1.
No Loop: T1 —> T2 —> T3 —> Alias (or) Shortcut of T1

What is the Report item?
Report item is nothing but a query item when it is drag and drop into the work area.

What is meant by Junk Dimension?
The Junk Dimension also called a garbage dimension.
A junk dimension is a convenient grouping of typically low-cardinality flags and indicators.

Explain Informatica Architecture?
Informatica consists of client and server. Client tools such as the Repository Manager, Designer, Server Manager. The repository database contains metadata it read by Informatica server used to read data from the source, transforming and loading into the target.

How to create measures and Dimensions?
You can create measure once you import all the data into the data source. You can create measures and dimensions by dragging the required source from the data source into a dimension map and measure tab. (need to find the scope of measures for all the dimensions)

What is Cardinality?
Cardinality is nothing but a relation between tables.
One to One > One to Many > Many to Many > Many to One

What is the transformer?
The transformer is used for building the Cubes (Multidimensional Structure used for OLAP.

How do you call a stored procedure within a transformation?
In the expression, transformation creates a new out port in the expression write: sp.stored procedure name(arguments).

What is meant by alternate drill down with ex?
Alternate drill down a path means there will be two paths to opt. For example- We will have time dimension now the client requirement is they want two type of year -one is the calendar year(Jan-Dec) and another is a fiscal year(Apr-Mar).

What is data mining?
Data mining is a process of extracting hidden trends within a data warehouse.

What is a catalog and types of catalogs in Cognos?
A catalog is a file containing the information (Database tables) that Impromptu users need to create reports. > personal > distributed > hared > secured

What is the difference between Informatica power mart and power center?
Using power center we can create a global repository
Power mart used to create a local repository
Global repository configure multiple servers to balance session load
Local repository configure an only single server

What is the difference between an enterprise data warehouse and data warehouse?
Big Organizations have a lot of diversified sources of data. There might be a Dataware house exclusively for transport and others for data related to the project the company runs. In such a case, the complete enterprise’s(company’s) data warehouse is a big combination of all and is known as the Enterprise Data Warehouse(EDW)

What are the types of prompt in Cognos?
Value prompt ,Text Prompt, Date prompt, Time prompt, Date and time prompt

How to join multiple db in the catalog?
The multiple databases could not be connected in a single catalog. So that we use Hotfile for this purpose.

What are the batches and their details?
Sequential(Run the sessions one by one
Concurrent (Run the sessions simultaneously)

How you drill from powerPLay to Impromptu? Explain all Steps?
go to tran former,
build the cube
right click on the cube and open properties
go to drill through the tab and select your report from that browse option

What is Drill Through?
Drill-through reporting allows you to link from one report to another. You can drill through in a number of ways. > A Drill Through id developed with two reports.
1. Parent Report > 2. Child Report.

How to generate cubes in Cognos?
Power Play Transformer contains dimension, measure, model and cube. we can generate cube a different way. > Just right click on cube name and build.
we can write a script in Unix. using that we can generate cube.

What is the main difference between mapplets and mapping?
Reuse the transformation in several mappings, whereas mapping not like that.
If any changes made in mapplets it automatically inherited in all other instance mapplets.

What are the products of Cognos?
Cognos 6.6 7.0,7.3(PowerPlay, Impromptu)–ReportNet1.0,1.1mr1, 1.1mr22—ReportNet 8.0(latest)IWR is use by Impromptu to publish reports, PPES is used by PP, Cognos Connection is used by repornet. there are many other tools but these are the main.

What is Zero-footprint? What are the other methods working as deployment functionality? Cognos offers Portal Services that allow organizations to easily manage and display Cognos business intelligence, planning, and score carding in your existing enterprise information portals. Including Cognos reports, analysis, dashboards, scorecards, and other capabilities drive higher returns in your information and portal investments.

Zero Footprint: Cognos portals have no footprint on the user’s desktop. Anyone inside or outside the organization with a Web browser can access and interact with content.
Intuitive User Interface: No special training is required to use the portal. Standard browser interface actions-such as following hypertext links, copying, and pasting-allow users to access and organize business intelligence content quickly and easily

What are the components of Report Net?
Framework manager, Cognos connection, Query Studio, Report Studio

What is a snapshot?
A Snapshot is the copy of data, when we create a snapshot it copies the exact data that related to the at the perticular report, we use snapshot when ever we want to compare reports. (Example: we want to compare this months report with previous months).

The source table has 5 rows. Rank in rank transformation is set to 10. How many rows the rank transformation will output?
5 Rank.

How can I test reports in Cognos?
In Cognos report net by the validate report option a report can be tested. If there will be any error, it will specify the error, unless it will give a message -‘report specification is valid’.
After creating the report we will connect to the Oracle and we will write the SQL query and we will compare these 2 reports.

What are shortcuts? Where it can be used? What are the advantages?
There are 2 shortcuts(Local and global) Local used in the local repository and globally used in the global repository. The advantage is to reuse an object without creating multiple objects. Say for example a source definition want to use in 10 mappings in 10 different folders without creating 10 multiple sources you create 10 shortcuts.

What is the difference between the content store and content manager?
A content store is a data base which stores the meta data of the reports.
But where as a content manager is a service which is available in the dispatcher. which it manages the security.

Define datastores in Cognos?
Data sources, also known as query databases, are relational databases, dimensional cubes, files, or other physical data stores that can be accessed through IBM Cognos8. Application Tier Components use data source connections to access data sources.

What is the bitmap index?
A bitmap for each key value replaces a list of row ids. Bitmap index more efficient for data warehousing because of low cardinality, low updates, very efficient for where class.

How can I schedule reports in Cognos?
By using Cognos Scheduler, one can schedule the running reports in Impromptu to execute and save it in the desired format.
By using Cognos MACRO script language the reports can be executed and distributed to recipients by using mail applications.
Compiled Cognos MACROs can be scheduled using Cognos Scheduler.

Give me an example of semi and non-additive measures?
Semi-Additive: Semi-additive facts are facts that can be summed up for some of the dimensions in the fact table, but not the others. Non-Additive: Non-additive facts are facts that cannot be summed up for any of the dimensions present in the fact table. Current Balance and Profit Margin are the facts. Current Balance is a semi-additive fact, as it makes sense to add them up for all accounts (what’s the total current balance for all accounts in the bank?), but it does not make sense to add them up through time (adding up all current balances for a given account for each day of the month does not give us any useful information). Profit Margin is a non-additive fact, for it does not make sense to add them up for the account level or the day level.

What is OLAP?
OLAP stands for On-Line Analytical Processing, a series of protocols used mainly for business reporting.

What is the metric store database?
A metric store database is a special case of a query database. A metric store database is used to store the information associated with metrics that appear in scorecards, including targets performance metrics, thresholds, membership in scorecards links to related reports.

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