# Index

An auxiliary data structure that helps an RDBMS locate rows without scanning every row.

## What is **Index** in a relational database?

**Index** — An auxiliary data structure that helps an RDBMS locate rows without scanning every row.

Level: Journeyman · [More Database terms at this level](https://www.ask-codey.com/glossary/subjects/database/journeyman)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/index