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The ORDER BY Algorithm Is Harder Than You Think

In this video I describe in detail how my implementation of the K-Way External Merge Sort algorithm works. K-Way External Merge Sort is an algorithm used to sort large datasets that don't fit in main memory (usually RAM). Therefore, this algorithm is used by databases like Postgres to process ORDER BY queries when tables don't fit in memory. The algorithm consists of a series of "passes" through one or multiple files and a number of in-memory buffers used to load and process different chunks of a file in each pass. The end result is a file that contains all the requested rows sorted by the keys given in the ORDER BY clause. 🌐 LINKS Algorithm Implementation: https://github.com/antoniosarosi/mkdb... ✉️ CONTACT INFO Business Email: [email protected] Contact Email: [email protected] Twitter:   / antoniosarosi   Instagram:   / antoniosarosi   LinkedIn:   / antoniosarosi   🎵 MUSIC    • [Chillstep] Broken Elegance - Shelter      • Ptr. - Genesis      • Digital Road      • Juno   📖 CHAPTERS 00:00 Introduction 00:22 The Memory Problem 01:32 Database Tables & Sorting 03:18 K-Way Data Structures 04:38 Algorithm Execution (Pass 0) 06:17 Pass 1 09:22 Pass 2 11:07 I/O Complexity 11:58 Variable Length Data 13:16 Final Thoughts 🏷️ HASHTAGS #programming #computerscience #algorithm