Here are the formulas for setting memory in SQL Server.
- Single-instance dedicated Max server memory formula: physical memory – 4G (or 10% whichever is greater to leave some GBs for the OS).
- Single-instance shared Max server memory formula: physical memory – 4G ( or 10% whichever is greater to leave some GBs for the OS ) – (memory for other services).
Use the sys.configurations view to query server configuration options including Max server memory(MB) and Min server memory (MB).
SELECT SERVERPROPERTY('InstanceName') AS myinstance, * FROM sys.configurations WHERE name IN ( 'max server memory (MB)', 'min server memory (MB)' ) GO
Use the sys.dm_os_sys_info view to query the total amount of physical memory in the server, number of schedulers, last server startup time, and if SQL Server runs in a virtual or physical environment
SELECT physical_memory_kb / 1024 AS Physical_Memory_MB FROM sys.dm_os_sys_info
Use the sp_configure system stored procedure to set server configuration options to prevent potential UI data entry errors.
sp_configure 'show advanced options', 1 GO RECONFIGURE GO sp_configure 'max server memory (MB)', <Value> GO RECONFIGURE GO
Cheers!
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