Article for:SQL Server▾ Query below lists table (and view) indexes. Query selectschema_name(t.schema_id) +'.'+ t.[name]astable_view,casewhent.[type] ='U'then'Table'whent.[type] ='V'then'View'endas[object_type], i.index_id,casewheni.is_primary_key =1then'Primary key'wheni...
適用於:SQL ServerAzure SQL 資料庫Azure SQL 受控執行個體Azure Synapse AnalyticsAnalytics Platform System (PDW)Microsoft Fabric 中的 SQL 資料庫 有關選項和建議,如何使用標準 SQL 的批量載入和緩慢插入方法,將資料載入至資料行存放區索引中。 將資料載入至資料行存放區索引是任何資料倉儲程序中不可或缺的一...
從SQL Server 2016 (13.x) 開始,您可以將非叢集 B-tree 或資料列存放區索引作為叢集資料行存放區索引的次要索引來建立。 資料列存儲索引發生變更時,B 型樹狀結構的非叢集索引也會更新。 您可以使用這項強大功能來發揮優勢。 藉由使用次要 B 型樹狀結構索引,您可以有效率地搜尋特定的資料列,而...
Azure SQL Database 支援資料表分割,方法是在 PRIMARY 檔案群組中建立分割。 針對 SQL Server 和 Azure SQL 受控執行個體,您可以根據檔案群組和檔案管理做法,考慮指定使用者建立的檔案群組。此範例會逐步說明如何使用 Transact-SQL 在 SQL Server Management Studio (SSMS) 中建立資料分割資料表,並將所有分割指派給 ...
在SQL Server Management Studio提供的查询分析器中,可以定义Transact-SQL的CREATE TABLE语句创建数据表。其语法格式如下: CREATETABLE[database_name . [ schema_name].|schema_name . ] table_name ( {<column_definition>|<computed_column_definition>}[<table_constraint>][,...n])[ON { partition_scheme...
1.--获取某个索引被使用的情况2.SETTRANSACTIONISOLATIONLEVELREADUNCOMMITTED;3.WITHXMLNAMESPACES(DEFAULT'http://schemas.microsoft.com/sqlserver/2004/07/showplan')4.SELECTCOALESCE(DB_NAME(p.dbid)5. ,p.query_plan.value('(//RelOp/OutputList/ColumnReference/@Database)[1]','nvarchar(128)'))6. AS...
-- Missing Indexes in current database by Index Advantage SELECT user_seeks * avg_total_user_cost * ( avg_user_impact * 0.01 ) AS [index_advantage] , migs.last_user_seek , mid.[statement] AS [Database.Schema.Table] , mid.equality_columns , mid.inequality_columns , mid.included_column...
-- List unused indexes SELECT OBJECT_NAME(i.[object_id]) AS [Table Name] , FROM sys.indexes AS i INNER JOIN sys.objects AS o ON i.[object_id] = o.[object_id] WHERE i.index_id NOT IN ( SELECT ddius.index_id FROM sys.dm_db_index_usage_stats AS ddius ...
Adistribution databasethat was created in an earlier version of SQL Server and is upgraded to SQL Server 2016 (13.x) RTM or Service Pack 1 has a compatibility level of 90, which isn't supported for other databases. This doesn't have an effect on the functionality of replication. Upgrading...
For columnstore indexes in SQL Server 2016 (13.x) and later versions, Azure SQL Database, and Azure SQL Managed Instance, REORGANIZE performs the following extra defragmentation optimizations online: Physically removes deleted rows from a rowgroup when 10% or more of the rows have been logically...