In an indexed view, I'm able to create indexes on (persistent & precise) computed columns, I'm able to create indexes on functions and scalar expressions, but I don't seem to be able to create an index on an expression that contains at least one computed column. Is that by design?
Assume that you have an indexed view on a table in Microsoft SQL Server 2012 or SQL Server 2014. When you run a query that contains common language runtime (CLR) functions in the WHERE clause against this view, a fatal exception ...
顾名思义,索引视图就是建有索引的视图,这是MSSQL提供的一项技术,用于提升某些SQL语句的查询性能。索引视图上的第一个索引必须是唯一簇索引,之后,可以在视图上创建更多的非簇索引,因为视图上的簇索引存储方式和表上的簇索引一样,因此,视图上的簇索引可以提升某些查询的性能。查询优化器可以通过索引视图来加速查询的...
so,. let close it with MS web site words Creating a unique clustered index on a view improves query performance because the view is stored in the database in the same way a table with a clustered index is stored. The query optimizer may use indexed views to speed up the query execution...
The usability of indexed views is limited. While all editions of SQL Server can create and consume an indexed view, it is only the Enterprise Edition and Developer Edition that will make use of them without the addition of the query hint NOEXPAND. As you'll see later, that condition limits...
With SQL Server 2000, the functionality of SQL Server views was expanded to provide system performance benefits. It is possible to create a unique clustered index on a view, as well as nonclustered indexes, to improve data access performance on the most complex queries. In SQL Server 2000 and...
This extends materialized view support to additional types of queries. This paper describes a prototype implementation of stacked views within Microsoft SQL Server and explains which classes of queries can be supported. To support view matching for stacked views, a signature mechanism was added to ...
situation is dramatically improved. But that’s not all. Now let’s run the original statement in Enterprise edition of SQL Server and see the plan. And this is the magic – even if you don’t reference the view in the select, SQL Server founds that it can use the view for this ...
GROUP BY TradingSymbol, PeriodId, StartDate, EndDate, MonthsInPeriodBelow is the SQL to build the clustered index.One thing to watch out for, when altering a view like this, the index is not scripted by default – i.e, if you do modify view or script view as alter, the index will...
With that caveat in mind, I’d like to do a review of Indexed Views because of a post I saw from a SQL User having trouble creating a Fulltext index on an indexed view.When we create a view we simply specify the select statement that will return the data we want displayed in the ...