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What is the difference b/w Application Server and Database server?

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database, application server, database server

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Oracel

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database

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database, RDBMS, Data Warehousing

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What is database?

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Asked By: edward |

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A database is a logically coherent collection of data with some inherent meaning, representing some aspect of real world and which is designed, built and populated with data for a specific purpose.

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Tuesday, May 13, 2008

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What is DBMS?

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Asked By: edward |

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It is a collection of programs that enables user to create and maintain a database. In other words it is general-purpose software that provides the users with the processes of defining, constructing and manipulating the database for various applications.

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Tuesday, May 13, 2008

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What is a Database system?

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Asked By: edward |

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The database and DBMS software together is called as Database system.

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Tuesday, May 13, 2008

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Describe the three levels of data abstraction?

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Asked By: edward |

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The are three levels of abstraction:
Physical level: The lowest level of abstraction describes how data are stored.
Logical level: The next higher level of abstraction, describes what data are stored in database and what relationship among those data.
View level: The highest level of abstraction describes only part of entire database.

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Tuesday, May 13, 2008

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Define the "integrity rules"

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Asked By: edward |

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There are two Integrity rules. Entity Integrity: States that "Primary key cannot have NULL value"
Referential Integrity: States that "Foreign Key can be either a NULL value or should be Primary Key value of other relation.

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