November 24, 2020 at 2:28 pm
Hi,
We are running a system on SQLServer 2017 Enterprise (RTM-CU22) with 839GB of memory.
I think we appear to be experiencing some memory pressure as we seem to have plans dropping from the cache and I can see various clock-hands running (including CACHESTORE_OBJCP – EXTERNAL and CACHESTORE_SQLCP – EXTERNAL).
When I check the Memory Clerks the bulk of memory is taken up by MEMORYCLERK_SQLBUFFERPOOL around 750GB, with about 26GB for CACHESTORE_OBJCP and CACHESTORE_SQLCP of around 8GB. Typically no other clerks are over 1 GB.
When I look in the RING_BUFFER_RESOURCE_MONITOR the only RESOURCE_MEMPHYSICAL_LOW events we see are for IndicatorsPool.
I’m a bit at a loss as to working out what is causing the pressure and what the RESOURCE_MEMPHYSICAL_LOW for IndcatorsPool is telling me (and if this is related).
Could anyone give me any pointers on where to look next?
Thanks
November 25, 2020 at 3:10 pm
Thanks for posting your issue and hopefully someone will answer soon.
This is an automated bump to increase visibility of your question.
November 26, 2020 at 10:35 am
Is max memory for the sql server instance set to lower than 839GB, so other applications like the operating system can run?
Is SSAS installed on the server? There was a blogpost that the default configuration reserves 20% of ram for SSAS. Which lives 80% for OS + SQL + other programs (backup, ssis, ...)
November 26, 2020 at 12:48 pm
Thanks for the response Jo.
The server has 960GB with the max memory for SQLServer set to 839GB. That along with no indications in the RING_BUFFER_RESOURCE_MONITOR of IndicatorsSystem with RESOURCE_MEMPHYSICAL_LOW make me think it isn't external to SQLServer.
SSAS is installed but disabled and not running.
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