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The Memory panel tracks the usage and availability of memory on your monitored SQL Server computer. Unexpected spikes in memory usage can warn you about the beginning of a serious performance issue. Chronically high memory metrics may indicate the need for server maintenance, query tuning, or other diagnostics to better handle the ongoing workload. Use the Memory view on the Resources tab to track key memory statistics over a period of time. For additional information, see Get memory performance details.
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Metric | Why it is important |
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SQL allocated | Indicates how much available memory is allocated to SQL Server from the operating system (SQLOS). Compare this metric to how much memory is actually being used by SQL Server. |
Indicates how much memory is currently used by SQL Server from the total allocated (SQL allocated) to this application. A higher SQL memory percentage indicates that you may have poorly performing queries or a fragmented database. | |
Indicates how much physical memory is used by the operating system (SQL Server and other applications). A higher total memory percentage indicates that the overall workload of the SQL Server computer is too intensive for the available resources. |
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The SQL Server Paging chart plots the number of swapped pages per second, over time, as calculated by the memory paging metric.
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The Host Memory Usage chart compares the amount of memory allocated and used by SQL Server to the total memory consumed on this host server. For additional information about how SQL Diagnostic Manager works with virtual machines and collects metrics, see How SQL Diagnostic Manager works with a virtual environment.
Metric | Why it is important |
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Active | Indicates the amount of memory actively used by all of your VMs on this host server. |
Ballooned | Indicates the amount of memory temporarily reclaimed by all of your VMs on the host system for use in other areas. A higher ballooned value indicates that the host server is under memory pressure. Review your load balancing for the host server. |
Consumed | Indicates the amount of memory consumed by all of your VMs on this host server. This value does not include shared memory or overhead memory for these VMs. |
Granted | Indicates the amount of physical memory granted by the host to all of your VMs. |
Swapped | Indicates the amount of memory swapped to disk by the hypervisor. |
Available alerts
- Host Memory Usage (Percent) Alert
- O/S Memory Usage (Percent) Alert
- O/S Paging Alert
- SQL Memory Usage (Percent) Alert
- VM Memory Usage (Percent)