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...
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 scalabili...
SQL Server、Azure SQL 資料庫 和 Azure SQL 受控執行個體 的語法。 syntaxsql 複製 ALTER INDEX { index_name | ALL } ON <object> { REBUILD { [ PARTITION = ALL [ WITH ( <rebuild_index_option> [ , ...n ] ) ] ] | [ PARTITION = partition_number [ WITH ( <single_partition_rebuild_...
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...
SQL Server 创建索引(index) https://www.cnblogs.com/Brambling/p/6754993.html https://www.cnblogs.com/yunfeifei/p/4140385.html https://blog.csdn.net/WuLex/article/details/73823668 索引的简介: 索引分为聚集索引和非聚集索引,数据库中的索引类似于一本书的目录,在一本书中通过目录可以快速找到你想要...
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...
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 ...
适用于:SQL ServerAzure SQL 数据库Azure SQL 托管实例Azure Synapse AnalyticsAnalytics Platform System (PDW) 为表或视图创建相关索引。 也称为行存储索引,因为它可能是聚集或非聚集的 B 树索引。 可以在表中不存在数据时创建行存储索引。 使用行存储索引提高查询性能,尤其是在查询从特定列中进行选择或需要按特定...
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 ...