File Organization and Handling

CONCEPTS

Data : Data in simple means facts.

File: A file is a collection of logically related records.

Data processing: It is defined as the manipulation or conversion of data into information.

Batch processing: In batch processing the transctions are collected in groups (batches), processed in groups and results are obtained periodically.

On-line processing: In online processing the result of the data processing teansction is available immediately. on-line application system ensures that records are in updated state at any time.

Real time processing: Real time processing controls the environmentby receiving data, processing them and taking actions quickly.

Field: This is the smaller unit. This is the building block of the file. fielsd is characterized by its size, length and type.

Record: A record is a named collection of related fileds that can be treated as a unit.nn

Serial file: A file in which the recordsare organized in specific order is called serial file.

Output mode: In order to write in the file, we must open the file in output mode. it always creates new file, if any data is already written in the file, that is overwritten with the new data.

Input mode: In order to read the information from an already created file, the file is opened in input mode.

Append mode: This mode is used to add records into an existing data file.

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