Can we take backup when the database is opened?
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Why null values are mapped as 0 in fact tables?
Give me a broad concept of what a data warehouse is, and what it might be used for?
Best Data Ware housing training institute in delhi
What is cost benefit analysis (cba)?
what are different storage options supported by oracle ?
Explain what are the different methods of loading dimension tables?
What are the types of dimensional modeling?
Can any one explain the hierarchies level data warehousing.
What is the difference between er modeling and dimensional modeling?
what is table partitioning? How it is useful to warehouse database?
what is the difference between etl tool and olap tools
I know of using applysimple, but there are other ways too?
Teradata 
