educative.io

What's Keyi in key ranges?

Child pointers (other than the first and last in the node) point to the subtree holding keys between the two key ranges **Keyi-1 < Keys <= Keyi.

What does Keyi even mean?


Course: Deep Dive into the Internals of the Database - Learn Interactively
Lesson: B-Tree

It is basically Key i. “Keyi” is a variable name used to represent a specific key within the context of explaining the structure and rules of a B-tree. It’s a common convention in technical documentation or educational materials to use variables like “Keyi” to represent a generic key at a specific position within a sequence or structure.

“Keyi-1” and “Keyi” are used to describe the key ranges in the B-tree. For example:

  • “Child pointers (other than the first and last in the node) point to the subtree holding keys between the two key ranges Keyi-1 < Keys <= Keyi.”

Here, “Keyi-1” represents the key that precedes “Keyi” in ascending order. The use of such variables helps in presenting a general concept without specifying a particular key value, making it easier to explain the structure and rules applicable to any key within the B-tree.

It has been updated in the course as following.