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CHAPTER 3 - Coggle Diagram
CHAPTER 3
FREE SPACE LISTS
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To create a file, search the free – space list for the required amount of space and allocate that space to the new file
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FILE ACCESS TECHNIQUE
Sequential
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Easiest to implement because records are stored & retrieved serially, one after other
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Direct
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Give users flexibility of accessing any record in any order without having to begin search from beginning of file
Indexed
Logically the same as sequential organization, but index is built indicating the block containing the record with a given value for the key field
Combine the advantages of a sequential file with the possibility of direct access using the primary key
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