Sql server resource governor per connection

Question

anyone know if there's a way to limit resources per connection if the server is busy? e.g. Users A,B,C all want to run resource intensive things at the same time. Can I limit them to user each 25% of the cpu/mem, only if the server is busy?  Can I
do this without having to create 3 pools? Right now if someone does a long query it will freeze other users connections.

Answer 1

I was under the assumption that you had three users and each should be given 25% of the resources. I.e., leave 25 % to the rest. You can do this two ways:
1. Have one pool with 75% (3*25%) for which these three uses all uses.
2. Have three pools, one pool each for the users.
Be aware that CPU governance is per scheduler. So depending on the type of load and how your connections are hitting the schedulers (CPUs) and how long running queries you have, the governance may be more or less precise according to your config.
And as for memory, governor doesn't do the buffer pool. Basically memory is worker memory used for query execution (think hash tables and such).
Yes, max will only step in when there is a need for it (when somebody else want to use the resources). 2012 introduced however a harder max, called CAP_CPU_PERCENT which *is* a hard limit.
Tibor Karaszi, SQL Server MVP |
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