A production SharePoint 2019 to Subscription Edition migration reveals things no documentation warns you about — unknown databases, 312 undocumented workflows, and a firewall approval that took 11 days. These are the 10 lessons that shaped every script in this series.
Zero Downtime Migration
SQL Log Shipping for SharePoint 2019 to Subscription Edition Migration: Step-by-Step Setup Guide
SQL Server log shipping is the database-layer engine that makes zero-downtime SharePoint migration possible — keeping your secondary SQL instance continuously synchronized while you prepare, so final cutover shrinks from hours to minutes. This post covers the full lifecycle: configuring log shipping across all SharePoint content databases using a CSV-driven PowerShell script, monitoring restore latency, simulating and repairing a log chain break, and cleanly disabling jobs at cutover. Production-ready scripts for 50+ databases are available in the SQL Migration Bundle.