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Three Level Architecture of DBMS or Logical DBMS Architecture
The logical architecture defines how data in the database is perceived by users. It is not deals with how the data is handled and processed by the DBMS, but only with how it looks. The process of data storage on the underlying file system is not revealed, and the users can influence the data without worrying about where it is located or how it is really stored. This results in the database having dissimilar levels of abstraction.
The majority of commercial Database Management Systems available today are based on the SPARC / ANSI generalised DBMS architecture, as proposed by the SPARC / ANSI Study Group on Data Base Management Systems. Therefore, this is also called as the SPARC / ANSI model. It separates the system into three levels of abstraction: the physical or internal level, the conceptual level, and the view or external level.
Primary index A primary index is a file that has a sorted series of records having two columns: a block address for that key field in the data file; and the ordering key field.
What are multiple inheritances? Multiple inheritances allow a class to inherit variables and methods from many super classes.
A relation instance indicates as r is a collection of tuples for a given relational schema at a exact point of time. A relation state r of the relation schema R (A 1 ,A 2 ,.....
File Organisation In Dbms Introduction Databases are used to store information. Usually, the principal operations we have to perform on database are those relating to:
List the internal controls that should be in effect solely because a EDP system is employed, classifing them as (1) Those controls pertaining to input of information and (2) All ot
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Explain the concepts of relational data model? Relational Data Model - The relational model was first introduced through Prof. E.F. Codd of the IBM Research in the year 1970
What is the difference among a primary index and a secondary index? Primary Index: A primary index is an ordered file whose records are of fixed length along with two fields.
For the question given below, you are required to submit design and implementation documentation as described over the page. Design, implement (in Java), test and document a set of
Consider an information system designed for an online company which provides IT products and services. These include desktops, laptops, networking products, IT books, parts, and te
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