Low physical/external memory

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Rating: 5.0/5 (1 vote cast)
9,223 0
Determining if your operating system is causing memory issues within your SQL Server instance can be a challenge. One way around it is to use the sys.dm_os_ring_buffers to show when server memory is low. Read more

Low virtual memory

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Rating: 5.0/5 (2 votes cast)
6,793 0
Determining if your SQL Server instance is experiencing memory issues within the SQL Server Virtual Address Space (VAS) can be a challenge. One way around it is to use the sys.dm_os_ring_buffers. Read more

Top buffer cache object

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Rating: 0.0/5 (0 votes cast)
9,854 0 ,
This metric measures the amount of memory used in the buffer cache by the largest object (based on the number of pages). It checks the sys.dm_os_buffer_descriptors to identify the object, and returns the relative percentage used. Read more

Hash warnings (last hour)

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Rating: 3.0/5 (3 votes cast)
9,768 0 ,
This metric measures the number of hash warnings events in the last hour. A hash warning event means that part of the data processed for a hash operation was written to tempdb. Read more

Out of memory errors

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Rating: 5.0/5 (2 votes cast)
9,526 0 , ,
The number of out of memory errors that have occurred within a rolling five minute window. If you just want to keep an eye out for any memory errors, you can watch the ring buffers for the Out of Memory error alert when it gets registered there. Read more

Buffer pressure

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Rating: 4.0/5 (5 votes cast)
10,981 1 , ,
Trying to determine if you have pressure in your buffer allocations can be difficult. Buffer cache hit ratio is an almost useless metric, so you need a mechanism to let you know if there’s a problem in that area. Read more