Memory upgrade can lead to performance issues

ByDr. SubraMANI Paramasivam

Memory upgrade can lead to performance issues

I had a live scenario where my servers were upgraded with the memory and all my ETL & Replication were totally down. Couldn’t figure out the actual issue and need to reset the whole process and run manually. I have about 6TB of database and 4Bn records. My initial workout with the admin guy is to find out the server problem itself and then came out with the server is kind of parallelized with the faulty motherboard. I have 2 processor and equal amount of RAM supplied to both of them. When the memory was upgraded equally one part of the processor couldn’t recognize the memory and found the faulty motherboard. One side it was good to find out the actual memory in place helped to identify and replace the faulty one. But on the other side the production system was totally disastrous. Then need to configure with the resource governor to distinguish the workload to help more for replication and also the default one. After the resource governor was setup properly, the following query produced the results to show average time take per millisecond.

SELECT as PoolName,
COALESCE(SUM(rgroup.total_request_count), 0)as TotalRequest,
COALESCE(SUM(rgroup.total_cpu_usage_ms), 0)as TotalCPUinMS,
WHEN SUM(rgroup.total_request_count) > 0 THEN
SUM(rgroup.total_cpu_usage_ms) /SUM(rgroup.total_request_count)
FROM sys.dm_resource_governor_resource_pools AS rpool LEFT OUTER JOIN
sys.dm_resource_governor_workload_groups AS rgroup
ON rpool.pool_id = rgroup.pool_id


PoolName TotalRequest TotalCPUinMS AvgCPUinMS
PP_BusUsers 0 0 0
PP_SSUsers 0 0 0
distribution 2613809 30510900 11
default 5730860 179191854 31
internal 0 4966873 0

About the Author

Dr. SubraMANI Paramasivam administrator

Dr.SubraMANI Paramasivam is a Data Platform MVP, Power BI Group Leader, International Speaker, Microsoft Certified Trainer and Principal Solutions Architect at DAGEOP Ltd, having 20+ years of DB, BI & Analytics experience. Dr.SubraMANI Paramasivam is a frequent speaker in SQLBITS, PASS Summit, PASS SQL Saturdays, SQLRelay, Data Platform Summit, MCT Summit, SQLServerGeeks Summit, INSIDESQL UK, Data Awareness Programmes, Data Day Events. He likes to enlighten the education & data and started his own journey with FREE Data Awareness Programme (, in remote areas who are in need. Mani speaks a lot about Visualization, Data Science, R Analytics, Azure concepts, Performance Tuning, DB & SQL Server Architecture, DBA, Partitioning, Resource Governor, Disaster Recovery, High Availability, Development, T-SQL Programming and Microsoft certifications.

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