# How We Built a Zero-Downtime Database Migration Service at Wix

DevFeed: [How We Built a Zero-Downtime Database Migration Service at Wix](<https://devfeed.tech/articles/how-we-built-a-zero-downtime-database-migration-service-at-wix-22636.md>)

Original publisher: [Read original article](<https://www.wix.engineering/post/how-we-built-a-zero-downtime-database-migration-service-at-wix>)

Author: Wix Engineering

Published: 2026-05-14T07:19:17Z

Content type: article

Language: en

Sources: [Wix Engineering](<https://devfeed.tech/sources/wix-engineering.md>)

Topics: [Databases](<https://devfeed.tech/topics/databases.md>), [migration](<https://devfeed.tech/topics/migration.md>), [Data Infrastructure](<https://devfeed.tech/topics/data-infrastructure.md>), [MySQL](<https://devfeed.tech/topics/mysql.md>), [Scalability](<https://devfeed.tech/topics/scalability.md>)

Tags: [amazon-msk](<https://devfeed.tech/tags/amazon-msk.md>), [data-infrastructure](<https://devfeed.tech/tags/data-infrastructure.md>), [database](<https://devfeed.tech/tags/database.md>), [database-migration](<https://devfeed.tech/tags/database-migration.md>), [databases](<https://devfeed.tech/tags/databases.md>), [db-topology](<https://devfeed.tech/tags/db-topology.md>), [debezium-connector](<https://devfeed.tech/tags/debezium-connector.md>), [good-tools-doesn-t-fit](<https://devfeed.tech/tags/good-tools-doesn-t-fit.md>), [how-db-mover-works](<https://devfeed.tech/tags/how-db-mover-works.md>), [infrastructure](<https://devfeed.tech/tags/infrastructure.md>), [migration](<https://devfeed.tech/tags/migration.md>), [mysql](<https://devfeed.tech/tags/mysql.md>), [scalability](<https://devfeed.tech/tags/scalability.md>), [summary-6-key-focal-points](<https://devfeed.tech/tags/summary-6-key-focal-points.md>), [the-challenge](<https://devfeed.tech/tags/the-challenge.md>), [the-python-service](<https://devfeed.tech/tags/the-python-service.md>), [the-result](<https://devfeed.tech/tags/the-result.md>)

## AI overview

Wix describes DB Mover, an internal service for transparent, zero-downtime database migrations between shared and dedicated MySQL clusters. The article explains the operational risks of shared clusters, migration requirements, and the topology managed by Wix's Data Infrastructure team.

## Source excerpt

The Challenge At Wix, multiple applications share the same DB cluster. The reasons vary: consolidating apps from the same domain, grouping several small apps that don't justify a dedicated cluster, or simply optimizing cost and operational overhead. However, this setup comes with a significant risk: every application on the cluster has the potential to impact all the others. One real example: we had a critical service related to user authentication sharing a DB cluster with several other...