Hi @Nur Hossain ,
Sure, it is possible to change the database server after SharePoint deployment. In a nutshell, Moving the SharePoint database from one server to another can be achieved with the following steps:
- Step 1: Stop All SharePoint Services
- Step 2: Backup & Restore All SharePoint Databases to the new SQL Server
- Step 3: Point the web application to the new database server by setting up SQL Server connection aliases
- Step 4: Start All SharePoint Services
See detailed steps and information in this article: Move all databases in SharePoint Server.
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