Hashing & Sorting

This lecture covers the concepts of hashing and sorting in data-intensive applications and systems. It starts with an introduction to hashing, explaining static hashing and its limitations. The lecture then delves into extendible hashing and linear hashing as solutions to the issues faced in static hashing. Examples are provided to illustrate the process of handling inserts and directory doubling. Additionally, the lecture discusses sorting techniques, including 2-way external sorting and general external merge sort. The cost analysis of external merge sort and the use of clustered B+ trees for sorting are also explained.