Version: Microsoft SQL Server 2012 (SP3) (KB3072779) - 11.0.6020.0 (X64) Oct 20 2015 15:36:27 Copyright (c) Microsoft Corporation Enterprise Edition: Core-based Licensing (64-bit) on Windows NT 6.3 (Build 9600: )

Once I update my statistics with full scan, with 10~20 seconds some of the statistics on the same table are getting update on secondary with a sample. I ran extended event trace to capture auto update stats on secondary node but nothing was logged. On primary node once I run this: Update statistics Tablename with fullscan I see this about my stats status enter image description here

When I query for the stats on secondary I get this. Look at the rows_sampled and last_updated column. enter image description here

I also ran an extended event trace to capture the auto update stats but nothing was logged. Here is the defination of my XE trace.

CREATE EVENT SESSION [AutoUpdateStats] ON SERVER ADD EVENT sqlserver.auto_stats(
  • No matter what I do, I can't get this to repro. Do you have an exact list of steps that you can repro this every time? – Sean Gallardy - Retired User Dec 14 '16 at 20:53
  • Yes I can. Update statistics on table1 with full scan. check statistics on both node. Running XE trace to capture auto update stats on Secondary node. – SqlWorldWide Dec 15 '16 at 13:19
  • That's exactly what I attempted (except for the XE) and could not reproduce. Does this happen on all of your 2012 AGs? – Sean Gallardy - Retired User Dec 15 '16 at 14:44
  • Not sure. I was not explicitly looking for this but found out when one of the query was taking longer on secondary node. I even tried to reproduce this in another table of same database but could not. – SqlWorldWide Dec 15 '16 at 17:08

I did open a case with Microsoft Support. I was notified similar behavior was reported by other customers. For now the solution is to rebuild the index. Microsoft is investigating further about the root cause.

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