Beyond Migration: Using Database Migration Service for Disk Shrinking
Google, Monday, November 2nd, 2026
Google Cloud explains how to use Database Migration Service to shrink Cloud SQL for SQL Server disks with minimal downtime.
Google Cloud shows how Database Migration Service, which supports Cloud SQL for SQL Server as a source, can be used for day-two operations such as reducing disk size.
Cloud SQL storage typically only grows, for example through automatic storage increase, and even after DBCC SHRINKFILE releases space from SQL Server files, the persistent disk stays at its peak allocated size.
By replicating continuously to a new, smaller Cloud SQL instance with DMS and then cutting over, teams can cut storage costs with little downtime.
Suggested scenarios include after major archiving, one-time storage spikes and schema optimization.