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SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED; GO DBCC TRACEON (8666); GO WITH XMLNAMESPACES (' as p) SELECT AS SQLCommand, qp.query_plan, Stats Used.XMLCol.value('@Field Value','NVar Char(500)') AS Stats Name FROM sys.dm_exec_cached_plans cp CROSS APPLY sys.dm_exec_query_plan(cp.plan_handle) qp CROSS APPLY sys.dm_exec_sql_text (cp.plan_handle) qt CROSS APPLY query_plan.nodes('//p: Field[@Field Name="wsz Stat Name"]') Stats Used(XMLCol) WHERE LIKE '%UPDATE%' AND LIKE '%Product ID%'; GO DBCC TRACEOFF(8666); GO statistic object in the query plan, and because it was out of date, SQL Server automatically updated it.If so, the plan is removed from the cache, and during recompilation of the query, the statistics are updated.The plan also is removed from the cache if any of the statistics it depends on have changed.The Oracle users can successfully see and use that field.The Oracle Table shows up in my SQL Server Linked Server.
If they are, then the automatic update of those statistics occurs.The technical article, Statistics Used by the Query Optimizer in Microsoft SQL Server 2008, documents these thresholds.For a regular table, statistics are out of date when:o The table had more than 500 rows when the statistics were gathered, and the colmodctr of the leading column of the statistics object has changed by more than 500 20% of the number of rows in the table when the statistics were gathered (test 3). Sales Order Detail table has 121317 rows:(121317 * 0.20) 500 = 24764The bulk insert below loads 24775 rows, which should be enough to invalidate statistics. The statistics have not updated, but the modification counter has changed, as expected.Invalidating Statistics For my demo I want to bulk insert enough rows to invalidate the statistics.SQL Server has pre-determined thresholds where it considers statistics to be out-of-date and therefore invalid.
The database had the Auto Update Statistics option enabled, and I had added almost 25,000 rows to a table with 121,000 rows.