December 10, 2018 at 10:09 pm
Comments posted to this topic are about the item Max Degree of Parallelism
December 10, 2018 at 10:10 pm
Nice question,Kendra
haven't thought about this for quite some time... good to dust off those cobwebs every so often...
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All limits henceforth are self-imposed.
“libera tute vulgaris ex”
December 11, 2018 at 12:41 pm
It's also one of the first settings I change whenever someone asks me to tune up their database. The default setting of 0 isn't great for most server instances. In most cases, MAXDOP should be set to the number of cores on a single CPU card.
December 11, 2018 at 6:19 pm
lmalatesta - Tuesday, December 11, 2018 12:41 PMIt's also one of the first settings I change whenever someone asks me to tune up their database. The default setting of 0 isn't great for most server instances. In most cases, MAXDOP should be set to the number of cores on a single CPU card.
Ok... where did you come up with that rule?
p.s. And, no... that's not a challenge. There's a bit of logic to that and I'd like to know more.
--Jeff Moden
Change is inevitable... Change for the better is not.
December 12, 2018 at 5:13 am
an interview question i got wrong many moons ago and has stuck with me since 🙂
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December 12, 2018 at 7:54 am
Jeff Moden - Tuesday, December 11, 2018 6:19 PMlmalatesta - Tuesday, December 11, 2018 12:41 PMIt's also one of the first settings I change whenever someone asks me to tune up their database. The default setting of 0 isn't great for most server instances. In most cases, MAXDOP should be set to the number of cores on a single CPU card.Ok... where did you come up with that rule?
p.s. And, no... that's not a challenge. There's a bit of logic to that and I'd like to know more.
It's Microsoft's recommendation and something Brent Ozar repeatedly hammers on.
See: https://support.microsoft.com/en-us/help/2806535/recommendations-and-guidelines-for-the-max-degree-of-parallelism-confi
https://www.brentozar.com/archive/2013/09/five-sql-server-settings-to-change/
December 12, 2018 at 7:54 pm
lmalatesta - Wednesday, December 12, 2018 7:54 AMJeff Moden - Tuesday, December 11, 2018 6:19 PMlmalatesta - Tuesday, December 11, 2018 12:41 PMIt's also one of the first settings I change whenever someone asks me to tune up their database. The default setting of 0 isn't great for most server instances. In most cases, MAXDOP should be set to the number of cores on a single CPU card.Ok... where did you come up with that rule?
p.s. And, no... that's not a challenge. There's a bit of logic to that and I'd like to know more.
It's Microsoft's recommendation and something Brent Ozar repeatedly hammers on.
See: https://support.microsoft.com/en-us/help/2806535/recommendations-and-guidelines-for-the-max-degree-of-parallelism-confi
https://www.brentozar.com/archive/2013/09/five-sql-server-settings-to-change/
Interesting. Thanks for the links.
My general rule of thumb is that no one or thing general gets to use more than 25% of the total CPU available or 8 CPUs, whatever is less. On boxes with a very low number of CPUs, I'll make exceptions based on the task(s) at hand.
--Jeff Moden
Change is inevitable... Change for the better is not.
December 19, 2018 at 12:40 am
Jeff Moden - Wednesday, December 12, 2018 7:54 PMlmalatesta - Wednesday, December 12, 2018 7:54 AMJeff Moden - Tuesday, December 11, 2018 6:19 PMlmalatesta - Tuesday, December 11, 2018 12:41 PMIt's also one of the first settings I change whenever someone asks me to tune up their database. The default setting of 0 isn't great for most server instances. In most cases, MAXDOP should be set to the number of cores on a single CPU card.Ok... where did you come up with that rule?
p.s. And, no... that's not a challenge. There's a bit of logic to that and I'd like to know more.
It's Microsoft's recommendation and something Brent Ozar repeatedly hammers on.
See: https://support.microsoft.com/en-us/help/2806535/recommendations-and-guidelines-for-the-max-degree-of-parallelism-confi
https://www.brentozar.com/archive/2013/09/five-sql-server-settings-to-change/Interesting. Thanks for the links.
My general rule of thumb is that no one or thing general gets to use more than 25% of the total CPU available or 8 CPUs, whatever is less. On boxes with a very low number of CPUs, I'll make exceptions based on the task(s) at hand.
I had an Issue recently but nothing I found via Google had a Value higher than 8.
December 19, 2018 at 9:40 am
David Conn - Wednesday, December 19, 2018 12:40 AMI had an Issue recently but nothing I found via Google had a Value higher than 8.
And, in fact, most of the resources I've come across suggest that 8 should be the max. I left that out of my original comment for brevity's sake.
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