In a Single-Host system with 100GB physical memory, what would the global allocation limit be set to?

In a Single-Host system with 100GB of physical memory, the global allocation limit is set to ensure that there is optimal performance while leaving sufficient memory for other system functions and processes. The global allocation limit generally comprises the portion of the physical memory that can be allocated to the database processes, and certain configurations recommend setting this limit to a value that is less than the total available physical memory.

Setting the global allocation limit to 90GB allows for a balance where the majority of the physical memory is available for HANA processes, while also maintaining a buffer (in this case, 10GB) for the operating system and any other applications running on the server. This buffer is crucial to ensure the overall stability and performance of the system, as it prevents potential memory contention between HANA and other applications, which can lead to performance degradation.

In this specific case, 90GB as the global allocation limit is a commonly adopted practice in high-performance scenarios, as it effectively utilizes the available resources while ensuring the system operates smoothly without overcommitting memory. This approach helps to maintain system health and responsiveness in a Single-Host setup.