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Re: UPDATE STATISTICS

Posted By: BENJAMIN THOMPSON
Date: Thursday, 25 January 2018, at 8:10 a.m.

In Response To: Re: UPDATE STATISTICS (Jack Parker)

> According to the book, you want to update stats high. In real life I do not
> recommend that against a huge table. I would instead go medium for large
> tables. Also set PSORT_NPROCS=10 from the environment, theoretically that
> helps.

I hate to be controversial but I have seen both these bits of advice given on the forum before now and I think they need to come with health warnings.

Using any form of parallelism for UPDATE STATISTICS HIGH or MEDIUM makes it take longer while at the same time doing more I/O and consuming more CPU VPs. The only effective way to get through a large amount of data quickly is to do multiple tables in parallel with PDQ off. I have spent quite a lot of time testing this to come to this conclusion.

Going for UPDATE STATISTICS MEDIUM for large tables will certainly complete the stats run a lot faster and it might work ok for you but you risk having insufficient resolution in your distributions for the optimizer to choose the right query plan. More generally I would say that if you deviate from the recommendations of HIGH mode on leading index columns, medium mode on non-leading index columns, you should do your own testing to make sure your apps and SQL still perform well.

If you employ the strategy of switching off PDQ, running a few stats streams in parallel you might not need to consider moving to medium level distributions for large tables.

Ben.

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