File access method
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There are three types of file access methods: sequential access, which processes records in order from first to last; random/direct access, which allows reading or writing records in any order without sequence; and indexed access, which constructs an index to store record locations based on indexed fields, allowing faster access than sequential.
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File access method
- 2. Three types of File Access Method Sequential Access Random/Direct Access Indexed Access
- 3. Sequential Access • This method is the simples of all method. • Information in the file is processed in order, one record after the other Operations Read Next Write Next Revine
- 4. Direct Access • Better than Sequential address • In this method, we can read or write randomly without any order Operations • Read n • Write n • Jump to record n
- 5. Indexed Access • Indexed Sequential file overcome the disadvantage of the sequential file. • These methods construct an index for the file. • An index stores the location of records based on the field or fields that you choose to index