You have a computer with only 2Mb of main memory. How do you use it to sort a large file of 500 Mb that is on disk?
You have a computer with only 2Mb of main memory. How do you use it to sort a large file of 500 Mb that is on disk?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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You have a computer with only 2Mb of main memory. How do you use it to sort
a large file of 500 Mb that is on disk?
Expert Solution
Step 1
The external merge sort algorithm, which sorts chunks that can all fit in RAM before merging the sorted chunks, is one type of external sorting. In order to accommodate each run into main memory, the file is first divided into runs of a manageable size. Then use the merge sort sorting technique to order each run in main memory. Once the file is sorted, combine the resultant runs into gradually larger runs.
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