I have a big staging table in our data warehouse which is of 6TB. So, my question is how to keep the stats up to date for such big and changing tables.2. Does update stats also uses tempdb behind the screens? Are you using fullscan or using a sample for the update? The statistics on the index will have been updated by the index rebuild job but with the SAMPLE option.Currently Autocreatestats = 1, Autoupdatestats =1.1. Does updating statistics takes locks on the data pages and can affect concurrency when update stats is kicked off?? What happens if update stats is cancelled after running more than 3 hours ?? Use sp_helpstats to get a list of the statistics on the table and use sp_autostats to get a list of the statistics with the last updated time and the AUTOSTATS setting. How much RAM do you have and what is the throughput you get from your IO subsystem for a large scan?Of course, the worst case scenario would be if you first rebuild your indexes, which also updates the index statistics by scanning the entire table, and later you run UPDATE STATISTICS using the default values, which again updates the index statistics but this time only with a default and smaller sample.
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Benjamin has also been a speaker at many SQL Server conferences and events around the world including the PASS Summit, SQL Server Connections and SQLBits.
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2) I usually recommend for my clients to DISABLE autoupdate stats on data warehouse tables, certainly the fact tables and all stage objects.
You simply cannot want stats updates to fire whenever you cross that 20% 500rows boundary during (sometimes multiple times??
4) Reorganizing an index, for example using the ALTER INDEX …
REORGANIZE statement, does not update any statistics.So depending on your maintenance jobs and scripts several scenarios can exist.The simplest scenario is if you want to rebuild all the indexes and update all the statistics.The statistics on the index will have been updated by the index rebuild job but with the SAMPLE option.Ans : No I'd start by breaking the update statsistics down to do individual statistics on the table rather than the whole table.Hi All, Need some advise on how to deal with UPDATING STATISTICS huge tables.