DIRECT ACCESS FILE Meaning and
Definition
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A direct access file refers to a type of computer file that allows immediate and random access to its data. It is a file organization method that permits direct retrieval of specific information within the file, without having to sequentially read through the entire file. This type of file structure is commonly implemented in database systems.
In a direct access file, data is stored in units known as records, which can be of fixed or variable length. Each record is assigned a unique identifier called a record key, which is used to identify and locate the desired information within the file. The file system maintains an index or a directory that maps these record keys to their physical storage locations, enabling swift access to the required data.
When accessing a direct access file, software programs can retrieve or modify any record by specifying its corresponding record key. This random access capability is especially valuable for applications that demand frequent and rapid retrieval of specific data, such as search engines, financial systems, and inventory management systems.
Compared to sequential access files, which require reading through the entire file to locate specific data, direct access files offer significant time savings and improved efficiency. However, the effectiveness of direct access is highly dependent on a well-designed indexing structure, as poor organization can lead to slower retrieval speeds and increased processing time.
Common Misspellings for DIRECT ACCESS FILE
- sirect access file
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- ditect access file
- di5ect access file
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- dirwct access file
- dirsct access file
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