> ## Documentation Index
> Fetch the complete documentation index at: https://launchdarkly-preview.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Redis

> This topic links to the documentation for configuring a persistent store with Redis, to support big segments.

> For the complete documentation index, see [llms.txt](/llms.txt). For the full documentation snapshot, see [llms-full.txt](/llms-full.txt).

## Overview

This topic links to the documentation for configuring a persistent store with Redis, to support big segments.A big segment is a segment that is either a [synced segment](/home/flags/synced-segments), or a [list-based segment](/home/flags/list-based-segments) with more than 15,000 entries that includes only one targeted [context kind](/home/flags/context-kinds). LaunchDarkly uses different implementations for different types of segments so that all of your segments have good performance.

If you are working with server-side SDKs, both synced segments and larger list-based segments require a persistent store integration. You must configure this integration for each environment where you create these segments.

To learn how to configure the Redis big segment store integration, read [SDK and integration configuration for segments](/home/flags/segment-config).