Need a Memory Utilization alert SQL Server 2008 r2

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Need a Memory Utilization alert SQL Server 2008 r2

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bmanning 59285

Posted Tuesday, September 25, 2012 5:24 PM

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I Need a Memory Utilization alert SQL Server 2008 r2. I am not sure which alert in sql server will statisfy for Memory Utilization. I would be interested in a powershell scipt that gives an alert if memory resources are maxed out.

Post #1364365

Evil Kraig F

Posted Tuesday, September 25, 2012 5:27 PM

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I recommend using Page Faults (not a SQL Server specific indicator) to indicate when the memory is falling to the page/swap file as your indicator. There's usually a little traffic there even under no pressure so you'll want to check your system for tolerance levels while it's running 'cleanly'.

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Post #1364368

Grant Fritchey

Posted Wednesday, September 26, 2012 3:49 AM

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You can check the ring buffers for one of three different error messages, Out of Memory messages, Low Physical memory or Low Virtual memory. You can also use the DBCC MEMORY_STATUS to compare target committed to current committed. I go over all these with example scripts in this Simple-Talk article. Just run these scripts from PowerShell if that's what you need.

----------------------------------------------------
"The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood..." Theodore Roosevelt
The Scary DBA
Author of: SQL Server 2012 Query Performance Tuning
SQL Server 2008 Query Performance Tuning Distilled
and
SQL Server Execution Plans

Product Evangelist for Red Gate Software

Post #1364536

bmanning 59285

Posted Wednesday, September 26, 2012 2:39 PM

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Hello Grant,

I ran the code below from your simple talk article. But do not see how an alert is generated. Could you help me.

WITH RingBuffer
AS (SELECT CAST(dorb.record AS XML) AS xRecord,
dorb.TIMESTAMP
FROM sys.dm_os_ring_buffers AS dorb
WHERE dorb.ring_buffer_type = 'RING_BUFFER_RESOURCE_MONITOR'
)
SELECT xr.value('(ResourceMonitor/Notification)[1]', 'varchar(75)') AS RmNotification,
xr.value('(ResourceMonitor/IndicatorsProcess)[1]', 'tinyint') AS IndicatorsProcess,
xr.value('(ResourceMonitor/IndicatorsSystem)[1]', 'tinyint') AS IndicatorsSystem,
DATEADD(ss,
(-1 * ((dosi.cpu_ticks / CONVERT (FLOAT, (dosi.cpu_ticks / dosi.ms_ticks)))
- rb.TIMESTAMP) / 1000), GETDATE()) AS RmDateTime,
xr.value('(MemoryNode/TargetMemory)[1]', 'bigint') AS TargetMemory,
xr.value('(MemoryNode/ReserveMemory)[1]', 'bigint') AS ReserveMemory,
xr.value('(MemoryNode/CommittedMemory)[1]', 'bigint') AS CommitedMemory,
xr.value('(MemoryNode/SharedMemory)[1]', 'bigint') AS SharedMemory,
xr.value('(MemoryNode/PagesMemory)[1]', 'bigint') AS PagesMemory,
xr.value('(MemoryRecord/MemoryUtilization)[1]', 'bigint') AS MemoryUtilization,
xr.value('(MemoryRecord/TotalPhysicalMemory)[1]', 'bigint') AS TotalPhysicalMemory,
xr.value('(MemoryRecord/AvailablePhysicalMemory)[1]', 'bigint') AS AvailablePhysicalMemory,
xr.value('(MemoryRecord/TotalPageFile)[1]', 'bigint') AS TotalPageFile,
xr.value('(MemoryRecord/AvailablePageFile)[1]', 'bigint') AS AvailablePageFile,
xr.value('(MemoryRecord/TotalVirtualAddressSpace)[1]', 'bigint') AS TotalVirtualAddressSpace,
xr.value('(MemoryRecord/AvailableVirtualAddressSpace)[1]',
'bigint') AS AvailableVirtualAddressSpace,
xr.value('(MemoryRecord/AvailableExtendedVirtualAddressSpace)[1]',
'bigint') AS AvailableExtendedVirtualAddressSpace
FROM RingBuffer AS rb
CROSS APPLY rb.xRecord.nodes('Record') record (xr)
CROSS JOIN sys.dm_os_sys_info AS dosi
ORDER BY RmDateTime DESC;

thanks

Brian

Post #1364934

Grant Fritchey

Posted Thursday, September 27, 2012 4:30 AM

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Like it says in the article:

To use sys.dm_os_buffers as part of a monitoring process, you just have to look for the two events, RESOURCE_MEMPHYSICAL_LOW or RESOURCE_MEMVIRTUAL_LOW. These are available in the ResourceMonitor/Notification property within the XML. They are an absolute indicator of a low memory condition on your machine, so if you get the alert, you were low on either external/OS/physical memory, or internal/SQL Server/virtual memory.

If you filter for those two events, when either one occurs, you have low memory of some type. To set up the alert, you'll need to connect your PowerShell script to email you in the event you get those results.

----------------------------------------------------
"The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood..." Theodore Roosevelt
The Scary DBA
Author of: SQL Server 2012 Query Performance Tuning
SQL Server 2008 Query Performance Tuning Distilled
and
SQL Server Execution Plans

Product Evangelist for Red Gate Software

Post #1365132

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