---
title: InfluxDB 3 Enterprise internals
description: Learn about InfluxDB 3 Enterprise internal systems and mechanisms.
url: https://docs.influxdata.com/influxdb3/enterprise/reference/internals/
estimated_tokens: 313
product: InfluxDB 3 Enterprise
version: enterprise
---

# InfluxDB 3 Enterprise internals

Learn about InfluxDB 3 Enterprise internal systems and architecture. Understanding these internals can help with performance optimization, troubleshooting, and advanced integrations.

## [Data retention in InfluxDB 3 Enterprise](/influxdb3/enterprise/reference/internals/data-retention/)

InfluxDB 3 Enterprise enforces database and table retention periods at query time and, to optimize storage, routinely deletes expired data.

## [InfluxDB 3 Enterprise authentication and authorization](/influxdb3/enterprise/reference/internals/authentication/)

InfluxDB 3 Enterprise uses an Attribute-Based Access Control (ABAC) model to manage permissions for authentication (authn) and authorization (authz).

## [Data durability](/influxdb3/enterprise/reference/internals/durability/)

Learn how InfluxDB 3 Enterprise ensures data durability through a structured write path that balances performance, persistence, and query efficiency.