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Statistics are small, and are created super fast– my query isn’t measurably any faster when I run it a second time.
Here’s what the statistics look like on the table in Object Explorer. If you want to verify which column is in each auto-created statistic, you can do that with this query: SELECT s.name, s.auto_created, s.user_created, as colname FROM sys.stats AS s JOIN sys.stats_columns as sc on s.stats_id=sc.stats_id and s.object_id=sc.object_id JOIN sys.columns as c on sc.object_id=c.object_id and sc.column_id=c.column_id WHERE s.object_id=OBJECT_ID('agg.
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Whenever you create an index in SQL Server, it creates a statistic associated with that index. You can’t drop statistics associated with indexes (unless you drop the index). SQL Server does a really good job creating single-column statistics automatically.If you have multiple SQL Servers using shared storage, that maintenance may hit the storage at the same time. ⇒ The moderate approach: One widely used free script is Ola Hallengren’s SQL Server Index and Statistics Maintenance script.If you’re managing lots of SQL Server instances and want ultimate customization, there is a free version of Minion Reindex. The answers to both of these questions impact what it does to GROUP those rows and SUM the Name Count column.Statistics take up a negligible amount of space compared to indexes.With default database settings, the SQL Server optimizer looks at how many changes have occurred for a given column statistic as part of query optimization.