Skip to main content

Data Warehouse Components

By
Typical Data Warehouse Components 
 
 



Data Warehouse Components
Data Warehouse Components

 

1. Source Systems

Source systems may be in the form of data existing in:

Production operational systems within an organization

Archives

Internal files not directly associated with company operational systems, such as individual spreadsheets and workbooks

External data from outside the company

2. Data Staging Area

The data staging area is analogous to a kitchen of a restaurant where raw food products are transformed into a fine meal. In a data warehouse, raw operational data is transformed into a warehouse deliverable analytical data fit for query and consumption.

It is both a storage area and a set of processes commonly known as Extract-Transformation-Load (ETL). It is off limits to business users and it is not suitable for querying and reporting. ETL is covered in detail later in the session. It may be an operational data store (ODS) environment, a set of flat files, a series of tables in a relational database server, or proprietary data structures used by data staging tools.

A normalized database for data staging area is acceptable.
Labels:

Comments

Post a Comment

Popular posts from this blog

Top 100 Informatica Interview Questions

By
I have attended Informatica interview last week in wipro and couple of other companies, Question below I faced in those companies. 1. What are the main issues while working with flat files as source and as targets ? 2. Explain about Informatica server process that how it works relates to mapping variables? 3. write a query to retrieve the latest records from the table sorted by version(scd) 4. How do you handle two sessions in Informatica 5. which one is better performance wise joiner or look up 6. How to partition the Session? 7. How many types of sessions are there in informatica.please explain them. 8. Explain the pipeline partition with real time example? 9. Explain about cumulative Sum or moving sum? 10. CONVERT MULTIPLE ROWS TO SINGLE ROW (MULTIPLE COLUMNS) IN INFORMATICA 11. DEPLOYMENT GROUPS IN INFORMATICA 12. LOAD LAST N RECORDS OF FILE INTO TARGET TABLE - INFORMATICA 13. LOAD ALTERNATIVE RECORDS / ROWS INTO...
129 comments
Read more

Top 130 SQL Interview Questions And Answers

By
1. Display the dept information from department table.   Select   *   from   dept; 2. Display the details of all employees   Select * from emp; 3. Display the name and job for all employees    Select ename ,job from emp; 4. Display name and salary for all employees.   Select ename   , sal   from emp;   5. Display employee number and total salary   for each employee. Select empno, sal+comm from emp; 6. Display employee name and annual salary for all employees.   Select empno,empname,12*sal+nvl(comm,0) annualsal from emp; 7. Display the names of all employees who are working in department number 10   Select ename from emp where deptno=10; 8. Display the names of all employees working as   clerks and drawing a salary more than 3000   Select ename from emp where job=’clerk’and sal>3000; 9. Display employee number and names for employees who earn commissi...
32 comments
Read more

OBIEE 11g dumps

By
I have cleared OBIEE 11g certification exam (1z0-591) exam yesterday, It was damn easy when compared to OBIEE 10g certification. I have referenced oracle PDF and some of the other OBIEE dumps. I remember some of the question which came in exam. I will publish those question very soon
79 comments
Read more