There are two options to lock the content database.
Option 1 (Recommended):
1. Open SharePoint Central Administration site, navigate to "Application Management" | "Site Collections" | "Configure quotas and locks".
2. Select the "site collection" which you would like to lock.
3. Choose "Read-only (blocks additions, updates, and deletions)", then click "OK".
- Note: Read more at Manage the lock status for site collections in SharePoint 2013
Option 2 (not recommended):
1. On your database server open
SQL Server Management Studio
2. Right click on the content database associated with the site collection you're migrating |
Options | Scroll to the bottom of the options list
4. For the
Database Read-Only choose True
- Figure - Database Properties | Options | Database-Read Only
5. Now it’s safe to take a backup of your content database
NOTE: When some SharePoint timer services are run it may cause the site to display errors when the database is in read-only mode