A day in the life of…

Welcome to the first part of CybOS. We talk a bit about the bootsector. From part 2 on, everything is “kernel based”, which means we have setup the system and jumped to our main kernel. From there, things get really interesting so I jump a bit fast to the boot code. However, in the end [...]

Somewhere in 1998 or even earlier, I started my own little project in creating a – functional – Operating System from scratch. Not a linux clone and not a MS-DOS wannabe. Just  a simple OS that is functional in such that some tools, games etc could actually work, not caring about Posix compliance, fancy graphics [...]

Cardinality and selectivity are two keywords that are very important when dealing with optimization in MySQL queries and indexes. This article will go a bit in depth on both terms and tries to let you understand their usefulness…