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17-Nov-2017 05:32

To be absolutely clear about it, the Enterprise-only view-matching feature never results in view statistics being created or updated.

This unintuitive behaviour is worth exploring a little, as it can have surprising side-effects.

This feature works with indexed views as well as base tables, but only if the view is explicitly named in the query and the hint is specified.

(There is always a statistics object associated with each index on a view, it is the automatic generation and maintenance of statistics not associated with an index that we are talking about here.) If you are used to working with non-Enterprise editions of SQL Server, you may never have noticed this behaviour before.

Lower editions of SQL Server require the is specified, automatic statistics are created on indexed views exactly as happens with ordinary tables.

Using SQL Server 2012 Standard Edition and the Adventure Works sample database, we first create a view that joins two sales tables and computes total order quantity per customer and product: For this view to support statistics, we need to materialize it by adding a unique clustered index.

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It is initially difficult to see where the cardinality estimate for the View Clustered Index Seek (11,267) came from.

This compilation does not create any statistics on the indexed view.



In a database, a view is the result set of a stored query on the data, which the database users can query just as they would in a persistent database collection object. This pre-established query command is kept in the database dictionary. Unlike ordinary base tables in a relational database, a view does not form part of the.… continue reading »


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May 10, 2012. A VIEW is a virtual table, defined by a query, that does not exist until it is invoked by name in an SQL statement. This may sound simple enough, but. or read-only, but not both. INSERT, UPDATE, and DELETE operations are allowed on updatable VIEW s and base tables, subject to other constraints.… continue reading »


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Jan 3, 2014. There is always a statistics object associated with each index on a view, it is the automatic generation and maintenance of statistics not associated with an index that we are talking about here. If you are used to working with non-Enterprise editions of SQL Server, you may never have noticed this behaviour.… continue reading »


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Jan 2, 2013. SQL Server views can get really weird when an underlying table is updated. I'll show. The broken views problem is something I discovered when working on a production system. When I first. I found an article SCHEMABINDING – use or not to use that discusses the consequences of schema binding.… continue reading »


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If you're comfortable working with SQL, you can also write an UPDATE statement by using SQL view. To use SQL view, create a blank, new query, and then switch the SQL view. This section presents the syntax for and an example of an UPDATE statement.… continue reading »


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In this tutorial, learn about INNER JOINS, MERGE, UPDATE and INSERT commands and how to use them on your SQL S. MERGE INTO books USING authors ON books.author_id = WHEN MATCHED THEN UPDATE SET books.primary_author = WHEN NOT MATCHED THEN INSERT.… continue reading »


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