The Value Of Auto-Created Statistics

Brent Ozar is here to praise statistics auto-creation:

Let me rephrase: before you even start playing around with statistics, make sure you haven’t taken away SQL Server’s ability to do this for you.

I like to make fun of a lot of SQL Server’s built-in “auto-tuning” capabilities that do a pretty terrible job. Cost Threshold for Parallelism of 5? MAXDOP 0? Missing index hints that include every column in the table? Oooookeydokey.

But there are some things that SQL Server has been taking care of for years, and automatically creating statistics is one of ’em.

There are edge cases where statistics auto-creation isn’t the best thing, but for the great majority of cases, it is a big positive.

Related Posts

Errors Updating Stats on Columnstore Indexes

Max Vernon walks us through some problems trying to update statistics on columnstore indexes: The first error above would be seen if you have a SQL Server Agent job that updates statistics. The second error is how it looks in an SSMS Query window. The error message claims that UPDATE STATISTICS can only be used on a […]

Read More

SET STATISTICS IO And Automated Statistics Updates

Niko Neugebauer shows us something new in SQL Server 2019: There has never been such information before!We are just writing into it!Why do we have those wonderful 1351498 logical reads ?Are they actually writes ? And if they would be, would not it be correct to display them as physical accesses ? The answer is […]

Read More

Categories

September 2018
MTWTFSS
« Aug Oct »
 12
3456789
10111213141516
17181920212223
24252627282930