# Read Replica Migration: Lessons and Query Routing Patterns

DevFeed: [Read Replica Migration: Lessons and Query Routing Patterns](<https://devfeed.tech/articles/don-t-add-a-read-replica-until-you-ve-read-this-11760.md>)

Original publisher: [Read original article](<https://incident.io/blog/dont-add-a-read-replica-until-youve-read-this>)

Author: Johanna Larsson

Published: 2026-07-21T11:00:45Z

Content type: tutorial

Language: en

Sources: [The incident.io Blog](<https://devfeed.tech/sources/the-incident-io-blog.md>)

Topics: [Databases](<https://devfeed.tech/topics/databases.md>), [Database](<https://devfeed.tech/topics/database.md>)

Tags: [incident](<https://devfeed.tech/tags/incident.md>), [incident-channel](<https://devfeed.tech/tags/incident-channel.md>), [incident-management](<https://devfeed.tech/tags/incident-management.md>), [incident-response](<https://devfeed.tech/tags/incident-response.md>), [learnings](<https://devfeed.tech/tags/learnings.md>), [migrations](<https://devfeed.tech/tags/migrations.md>), [outage](<https://devfeed.tech/tags/outage.md>), [patterns](<https://devfeed.tech/tags/patterns.md>), [post-mortem](<https://devfeed.tech/tags/post-mortem.md>), [read-replica](<https://devfeed.tech/tags/read-replica.md>), [slack-incident](<https://devfeed.tech/tags/slack-incident.md>)

## AI overview

The article shares incident.io's experience migrating workload to a read replica, including the benefits, operational complexity, and patterns for routing queries between the replica and primary database.

## Source excerpt

Our learnings from implementing a product-wide read replica migrations, including some useful patterns for routing queries to replica and primary