Database Management Systems

This storage structure in Oracle contains all the database data that the users of the database save and retrieve using SELECT and other DML statements.

This method modifier in Oracle tells that the subtype method will override another subtype method.

Data warehouse is a collection of corporate information derived from the operational systems and some external data sources.

This criteria for data warehouse requires incemental loading of new data on a periodic basis within narrow time window.

This category of data warehouse contains a place for storing data, that are 5 to 10 years old, to be used for comparisons, trends and forecasting.

Data mart is a workgroup or departmental warehouse, which is small in size.

This data is typically stored in a format that makes analysis much easier.

In this category, data are not updated or changed in any way once they enter the data warehouse, but are only loaded and accessed.

The performance of the database server must be good enough to support the user's performance expectations during analysis.

The scalability of the server must be such that your choice of server can handle the requirements of an ever-growing amount of data in the data warehouse.

 He must know how to phrase questions for determining the end users' needs.

In this criteria, many steps are taken to load new or updated data into the data warehouse including data conversion, filtering, reformatting, integrity checks, physical storage, indexing and metadata updates.

This memory component of the system global area is used for handling large input/output requests of server processes.

Control files maintain the timestamp of database creation.

This memory component of the program global area holds a session's variables and session-related information.