SQL Server max server memory

I created a Max Server Memory Matrix on this site some time ago, which lists physical memory in 4 GB increments from 4 to 1,024 GB, along with the recommended max server memory setting.

By the way, “Max Server Memory” corresponds to 128GB limit, it does not include columnstore or memory-optimized tables and indexes. Follow below steps to assign max memory to SQL Server using query. I’ve tested it on multiple versions of SQL from 2005RTM upwards, with memory from sub-4GB to 128GB+ machines. You can clearly see that if you enter a silly figure such as 50 MB, the minimum memory amount allowable for max server memory is 128 MB. This option, which cannot be used in combination with the /SQL…MEMORY arguments, tells setup to come up with recommended min and max server memory settings for you, based solely on the hardware. It assumes that SQL Server is the only service on the server, and that columnstore and in-memory OLTP features are not being used. Traditionally questions about how much memory SQL Server needs were aimed at how to appropriately set the ‘max server memory’ sp_configure option in SQL Server, and in my book the recommendation that I make is to reserve 1 GB of RAM for the OS, 1 GB for each 4 GB of RAM installed from 4–16 GB, and then 1 GB for every 8 GB RAM installed above 16 GB RAM. Here’s an example of a server that was restarted several days ago, and still hasn’t used 4GB of its 85GB max memory setting. I'm managing about 90 SQL Server instances and need a query to determine how much memory has been allocated to each instance.

Or use below query. Whatever demands are placed on the server, total server memory does not rise further than 9GB, even though CPU and page life expectancy both appear to be suffering as a result. Another re-post of a video from last year, this time showing you an in-built protection of setting max server memory for your SQL Server. 在SSMS的UI界面设置 “ max server memory ” ，即使你设置为10M大小，但是它会 “ 悄悄 ” 默认修改为128M，你用Profile跟踪或 … Then click OK. You can verify the value by reopening the dialog box. As a consultant, I have seen memory pressure and memory exhausted too many times to count because the DBA was unaware of this. The server has 30GB RAM, with SQL Server max memory set at 24GB and min memory at 0. It assumes that SQL Server is the only service on the server, and that columnstore and in-memory OLTP features are not being used. You'll also need to call reconfigure afterwards for the new setting to take effect. Then monitor SSIS and SQL server memory usage with perfmon counters.

Of course, it may need tuning for certain servers if they’re running SSRS, SSAS, or any other software, but for a general SQL Server config, this is a good starting point. When thinking about configuration parameters for SQL Server, one of the first ones to look at is the sp_configure option ‘max server memory’. Regarding how much memory to keep for SQL server you should take help of Perfmon counters. select * from sys.configurations where name in ('min server memory (MB)', 'max server memory (MB)') To change one or both of those values, use sp_configure. A SQL Server instance continues to acquire physical memory until it either reaches its max server memory allocation target or Windows indicates there is no longer an excess of free memory; it frees memory when it has more than the min server memory setting, and Windows indicates that there is a shortage of free memory. Important. Setting max server memory value too high can cause a single instance of SQL Serverto compete for memory with other SQL Server instances hosted on the same host. If the server is dedicated to SQL Server and has ‘max server memory’ set to prevent memory pressure, there is no benefit from setting ‘min server memory’ equal to ‘max server memory’ and at the same time there is not really a problem with doing it either. With the 20GB for the CLR object, that would put your max SQL memory setting at about 414GB. With 500GB RAM, you might want to leave 66GB available for the OS.

Below dialog box will appear. Here, I’m not showing max memory – just the OS in the VM, and target and total: In versions up to SQL Server 2008 R2, max memory referred to physical memory. A nice, easy query to set maximum memory to a sensible value. Please note, I'm not asking how to set it, just to see what it's currently set to without using the Management Studio. Go to memory tab, and Fill the values in “Maximum server memory (in MB)”. It never rises up to 10GB, let alone 60GB.

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