SQLServer的查询优化器总是尝试找到最佳的执行计划,有时候虽然你建立了索引视图,但优化器依然使用了原始表上的索引,此时你可以使用 WITH NOEXPAND 来强制使用索引视图上的索引(而不是原始表上的索引)。 索引视图在SQLServer2012 的各个版本上都有支持,在开发版或企业版中查询处理器甚至能以此来把匹配索引视图的查询都...
The maximum allowable size of the combined index values is 900 bytes for a clustered index, or 1,700 for a nonclustered index. The limits are 16 columns and 900 bytes for versions before SQL Database and SQL Server 2016 (13.x).Columns that are of the large object (LOB) data types ...
The size of a column depends on the data type and length specification. For more information, see Data Types (Transact-SQL). Num_Leaf_Cols = Num_Key_Cols + number of included columns Fixed_Leaf_Size = Fixed_Key_Size + total byte size of fixed-length included columns Num_Variable_Leaf_...
SQL Copy SELECT AddressLine1, AddressLine2, City, StateProvinceID, PostalCode FROM Person.Address WHERE PostalCode BETWEEN N'98000' AND N'99999'; GO To cover the query, each column must be defined in the index. Although you could define all columns as key columns, the key size would ...
FullTextIndexSize Property Reference Feedback Definition Namespace: Microsoft.SqlServer.Management.Smo Assembly: Microsoft.SqlServer.Smo.dll Package: Microsoft.SqlServer.SqlManagementObjects v160.2004021.0 C# 複製 [Microsoft.SqlServer.Management.Sdk.Sfc.Metadata.SfcProperty(Microsoft.SqlServer.Managemen...
FullTextIndexSize 属性Gets the size of the full-text index.命名空间: Microsoft.SqlServer.Management.Smo 程序集: Microsoft.SqlServer.Smo(在 Microsoft.SqlServer.Smo.dll 中)语法 C# 复制 [SfcPropertyAttribute] public int FullTextIndexSize { get; } 属性值 类型:System. . :: . .Int32 An Int...
| <grid_size>, <grid_size>, <grid_size>, <grid_size> } ) } <tessellation_cells_per_object> ::= { CELLS_PER_OBJECT = n } <grid_level> ::= { LEVEL_1 = <grid_size> | LEVEL_2 = <grid_size> | LEVEL_3 = <grid_size> | LEVEL_4 = <grid...
Index对数据库性能有着举足轻重的作用。Index设计的优劣直接影响到DB执行的效率。所以在做DB Tuning时,一部分会从Index着手处理,SQL Server也提供了很好的工具Database Engine Tuning Advisor,会给出一些建Index和优化方面的建议。 二:Index概述 这方面在各个博客论坛上面已经讲的比较多了,在此大致总结一下: ...
If ADR is enabled, creating or rebuilding a large index online can substantially increase the size of persistent version store (PVS) while the index operation is in progress. Ensure that the database has sufficient free space for PVS to grow. For more information, seeMonitor and troubleshoot ...
| <grid_size>, <grid_size>, <grid_size>, <grid_size> } ) } <tessellation_cells_per_object> ::= { CELLS_PER_OBJECT = n } <grid_level> ::= { LEVEL_1 = <grid_size> | LEVEL_2 = <grid_size> | LEVEL_3 = <grid_size> | LEVEL_4 = <grid_size> } <grid_size...