索引主要目的是提高了SQL Server系统的性能,加快数据的查询速度与减少系统的响应时间 。 但是索引对于提高查询性能也不是万能的,也不是建立越多的索引就越好。索引建少了,用 WHERE 子句找数据效率低,不利于查找数据。索引建多了,不利于新增、修改和删除等操作,因为做这些操作时,SQL SERVER 除了要更...
table_or_view_name 要为其建立索引的表或视图的名称。 若要在视图上创建索引,必须使用该视图定义 SCHEMABINDING该视图。 必须先为视图创建唯一的聚集索引,才能为该视图创建非聚集索引。 有关索引视图的详细信息,请参阅 “备注”。 从SQL Server 2016 (13.x) 开始,该对象可以是聚集列存储索引存储的表。 当<dat...
table_or_view_name 要建立索引之資料表或檢視的名稱。 若要在檢視上建立索引,必須使用 定義 SCHEMABINDING檢視。 必須先在檢視表上建立唯一叢集索引,才能建立任何非叢集索引。 如需索引檢視的詳細資訊,請參閱。 從SQL Server 2016 (13.x) 開始,此物件可以是與叢集資料行存放區索引一併儲存的資料表。 當<databa...
索引主要目的是提高了SQL Server系统的性能,加快数据的查询速度与减少系统的响应时间 。 但是索引对于提高查询性能也不是万能的,也不是建立越多的索引就越好。索引建少了,用 WHERE 子句找数据效率低,不利于查找数据。索引建多了,不利于新增、修改和删除等操作,因为做这些操作时,SQL SERVER 除了要更新数据表本身,还...
For more information, see XML indexes (SQL Server). SQL Server 2012 SP1 introduced a new type of XML index known as a Selective XML Index. This new index can improve querying performance over data stored as XML, allow for faster indexing of large XML data workloads, and improve scalability...
For more information, see XML indexes (SQL Server). SQL Server 2012 SP1 introduced a new type of XML index known as a Selective XML Index. This new index can improve querying performance over data stored as XML, allow for faster indexing of large XML data workloads, and improve scalability...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL database in Microsoft Fabric Modifies an existing table or view index (rowstore, columnstore, or XML) by disabling, rebuilding, or reorganizing the index; or by ...
To see which indexes the query optimizer uses for a specific query, in SQL Server Management Studio, on the Query menu, select Include Actual Execution Plan.Do not always equate index usage with good performance, and good performance with efficient index use. If using an index always helped ...
For more information about the editions of SQL Server that support parallel index operations, see Editions and supported features of SQL Server 2022. Because a shared (S) lock or a schema modification (Sch-M) lock is held in the final phase of the index operation, be careful when you run...
On multiprocessor systems that are running SQL Server Enterprise or higher, index statements may use multiple processors (CPUs) to perform the scan, sort, and index operations associated with the index statement just like other queries do. The number of CPUs used to run a single index statement...