Database Attach is a process in SharePoint used to upgrade a SharePoint farm by attaching a content database from an earlier version of SharePoint to a newer version of the SharePoint farm. This method is often used when migrating from one version of SharePoint to another, such as from SharePoint 2013 to SharePoint 2016.

Key Steps in Database Attach Process

• Preparation: Ensure that you have a backup of the existing SharePoint environment and databases. Verify that the new SharePoint version is properly installed and configured.

• Detaching Databases: Detach the content databases from the previous SharePoint environment if necessary. This step ensures that the databases are not in use during the attachment process.

• Attach Databases: Use the SharePoint Management Shell or Central Administration to attach the content database to the new SharePoint farm.

• Upgrade the Databases: After attaching the databases, run the SharePoint Products Configuration Wizard or use PowerShell commands to upgrade the content databases to the new schema and structures.

• Post-Upgrade Steps: Review and verify that all features, solutions, and customizations work as expected. Perform any additional configurations as needed.

Benefits

• Flexibility: Database attach provides flexibility in migrating specific content databases without having to migrate the entire farm.

• Minimal Downtime: This approach can minimize downtime, especially when carefully planned and executed.

• Version Control: Allows for easier management of SharePoint versions and maintenance of content databases.

Considerations

• Compatibility: Ensure compatibility of custom solutions and features in the new SharePoint version.

• Testing: Conduct thorough testing in a development or test environment before performing the database attach in production.

• Performance Monitoring: Monitor the performance and functionality of the SharePoint environment after the database attach operation.

Database attach is a powerful method for upgrading SharePoint environments and moving content databases between versions, allowing organizations to take advantage of the latest features and improvements in SharePoint.