Sql server statistics not updating
They say that the performance of the application running on top of SQL Server runs slower when the statistics are being updated, but there may be other reasons that may degrade performance like the intense disk activity produced when updating statistics.In this tip, we will cover a scenario where we update statistics while the database is being used to see if blocking does occur during the statistics update.These statistics are used by the Query Optimizer to determine the optimal Query Execution Plan.The characteristics of these statistics objects are further discussed here.
SQL Server has pre-determined thresholds where it considers statistics to be out-of-date and therefore invalid.Try as I might, I find it hard to over-emphasize the importance of statistics to SQL Server.Bad or missing statistics leads to poor choices by the optimizer: The result is horrific performance.This is a hot topic in the SQL Server DBA community.Some people say that a statistics update blocks transactional activity.
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The database had the Auto Update Statistics option enabled, and I had added almost 25,000 rows to a table with 121,000 rows.