Roles on cognos side:

1.  Cognos architect role:

• Meta data modeling as per the report requirement
• Creating projects, creating models, creating packages

2.  Cognos administration roles: 

• Installations and configurations, creating users, assigning permissions and privileges to users and taking the backups, tuning the servers, providing security to the objects.

 3.  Cognos report developer:

• Developing the report by going through RRT (report requirement template)

  RRT:  (report requirement template) It is a document which contains all the required information to develop a report application

• Cognos is a reporting tool (or) BI tool (or) OLAP tool
• It is a product of IBH
• It is a client server technology
• It is a GUI based tool (graphical user interface)
• IBM cognos BI is a completely web based dynamic business intelligence reporting solution from IBM

Pre request installing cognos:

1. Operating system – windows xp professional
2. Database – oracle, windows SQL server
3. Web server - IIS
4. Cognos software

• Where we install cognos the following two types of components

1. Windows based component
2. Web based component

Windows based component: 

1. Frame work manager
2. Map manager

Web based manager:

1. Cognos connection
2. Report connection
3. Query studio
4. Analysis studio
5. Event studio

Query subject:

• In cognos terminally a table is called as query subject
• By default every query subject is associated with a query with feature the actual data from database at the time of execution
• Query subjects are two types

1. Dimensional query subject
2. Fact query subject

Dimensional query subject:

A query subject which contains any identifiers and attributes without any measures is called a dimensional it is symbolically

Fact query subject:

A query subject which contains measures along with dimensions is called a fact query subject. It is symbolically represented with  

Query items:

Columns are called as query items in cognos query items are called categorized in to 3 types

1. Identifiers
2. Attributes
3. Measures

Identifiers: Key, columns, data columns

These core tutorials will help you to learn the fundamentals of Cognos. 
For an in-depth understanding and practical experience, explore Cognos Training

Attributes: Descriptive columns   Measures: Key performance indicators Note:    The default aggregation for measure is “sum” Eg:    at database level; customer (table) At frame work manager level: customer is called as query subject   Customer: Custno, cutname, cust_age, cust_add, mail_id, Qty, rename (Query items) Identifier: cust no Attributes: cust names, cust_age, cust_address, mail_id Measures: Qty rename.  

Package:

A package is created by copying all the objects required from the project

• Provide the security to the project before publishing in to content store( database)

For in depth understanding Cognos Training click on

• Cognos Tutorials
• Introduction to IBM COGNOS
• Dimensions & OLAP Types in Cognos
• Reporting Studio in IBM Cognos
• Fitters and its types in Cognos
• Cognos Training In Hyderabad