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After the change, you can monitor overall system performance looking for improvements, especially around query execution plans.Recently in one of the webcast, while I was presenting about statistics and performance tuning, I was asked by one of the attendees that if there is anyway to find out all the outdated statistics based on the dates from the server. The definition of the outdated is extremely subjective and often misunderstood.The SQL Server creates statistics in different ways: When you set the AUTO_CREATE_STATISTICS option on, the Query Optimizer creates statistics on individual columns used in a predicate, if these statistics are not already available.These statistics are necessary to generate the query plan.You can also set the database to update statistics asynchronously: If you enable this option then the Query Optimizer will run the query first and update the outdated statistics afterwards.When you set this option to OFF, the Query Optimizer will update the outdated statistics before compiling the query.You can enable the automatic statistics creation by running this SQL statement: The outdated statistics can cause a lot of performance issues therefore it is recommended to enable it. The usual symptoms of non-updated statistics are suboptimal query plans and degraded performance.
The auto update statistics feature can be turned off at different levels: Please note that if you disable the auto update statistics option on the database level then there will be no statistics updates regardless of the individual table, index or statistics object settings.
You can use SQL Server Profiler to monitor the Missing Column Statistics event class.
You should also consider creating statistics when your query selects from a subset of data or the query predicate contains multiple correlated columns.
There are opposing viewpoints, though, and here’s a few links for more learning: In SQL Server Management Studio, you can right-click on each database and go into its properties to change Auto Update Stats Asynchronously back to the default, Disabled.
Auto Update Stats also has to be enabled for this change to actually do anything – otherwise stats aren’t being updated anyway.