Keeping SQL Server up-to-date is something I recommend my customers from time to time. One of the tasks I undertake is to check the current SQL Server version information as soon as I get started to work. Though this recommendation looks trivial at the first look, this is often something people don’t take it seriously. Almost in every environment that I have done this exercise, I see them being behind on the Service pack updates majority of the times. Let us learn in this blog post how to fix the error- Disallowing page allocations for database ‘DB’ due to insufficient memory in the resource pool.