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[28 Sep 2015 | No Comment | | by jawad]

Indexed sequential organization is a file organization scheme that allows both sequential and direct access to data. Thus files organized in this manner must be on a direct access storage device such as a disk. With indexed sequential organization records are usually physically arranged on a storage medium by their primary key just as they are with sequential organization. The difference is however that an index also exists for the file , it can be used to lookup and directly access individual records. Direct …

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[21 Sep 2015 | No Comment | | by jawad]

A base table is an important special case of the more general concept table. Now , therefore we begin by making that general concept more precise. Here then is a definition .A table in a relational system consists of row of column heading together with zero or more rows of data values for a given table.

The column heading row specifies one or more columns, giving among other things as data types for each. Each data row contains exactly one scalar value for each of the column specified in …

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[13 Sep 2015 | No Comment | | by jawad]

Teleprocessing technologies provide certain benefits by restructuring the way people interact when working. For example many companies have developed telemarketing systems that directly provide customers with service from the central staff that has good access to information, thereby eliminating the need for field sales people to physically attend to all orders and service calls. Also several companies have a comprehensive transaction processing system that operates with real time databases. These systems eliminate the need for hand carrying paperwork from desk to desk and making …