ALTER TABLE ADD CONSTRAINT (PRIMARY KEY or UNIQUE) Index on a local temp tableClustered index Only one subclause is allowed at a time. For example, you can't add and drop PRIMARY KEY or UNIQUE constraints in the same ALTER TABLE statement. ALTER TABLE DROP CONSTRAINT (PRIMARY KEY or UNI...
ALTER TABLE ADD CONSTRAINT (PRIMARY KEY or UNIQUE) Index on a local temp tableClustered index Only one subclause is allowed at a time. For example, you can't add and drop PRIMARY KEY or UNIQUE constraints in the same A...
企业版中,支持使用SORT_IN_TEMPDB命令时创建过程在temp数据库中完成,提高数据库的并发效率。同时通过ONLINE命令支持在索引创建过程中允许用户访问。 13. 索引选项 PAD_INDEX,FILLFACTOR,索引页面的填充率。 14. 索引管理 可以在FileGroup上创建索引,可以进行非聚簇索引分区。 15. 视图的类型 SQL Server 2005中支持:一...
Index on a local temp table Initial unique clustered index on a view Disabled clustered indexes Clustered columnstore indexes in SQL Server 2017 (14.x)) and earlier versions Nonclustered columnstore indexes in SQL Server 2016 (13.x)) and earlier versions Clustered index, if the underlying table...
Modifies an existing table or view index (rowstore, columnstore, or XML) by disabling, rebuilding, or reorganizing the index; or by setting options on the index.
when we create an index on a temp table, a sort operation is automatically done, which means an overhead time wise... later when the temporary table is used in a query then the optim...
bulk insert tableA FROM 'c:\temp\fileA.csv' csv文件的数据并行的装载到多个Row Group和多个Delta Store 中;超过102400条记录的数据进入Row Group,列压缩;没有超过102400条记录的数据进入 Delta Store (Delta Row group)。 因为Row Group提供了高的压缩比,所以装载数据产生的日志也会少很多; SQL Server会自动...
SQL Copy CREATE UNIQUE INDEX index1 ON schema1.table1 (column1 DESC, column2 ASC, column3 DESC); Key scenario: Starting with SQL Server 2016 (13.x), in Azure SQL Database, and in Azure SQL Managed Instance, you can use a nonclustered index on a columnstore index to improve data...
SQL Copy CREATE UNIQUE INDEX index1 ON schema1.table1 (column1 DESC, column2 ASC, column3 DESC); Key scenario: Starting with SQL Server 2016 (13.x), in Azure SQL Database, and in Azure SQL Managed Instance, you can use a nonclustered index on a columnstore index to improve data...
CREATE UNIQUE INDEX index1 ON schema1.table1 (column1 DESC, column2 ASC, column3 DESC); Key scenario: Starting with SQL Server 2016 (13.x), in Azure SQL Database, and in Azure SQL Managed Instance, you can use a nonclustered index on a columnstore index to improve data warehousing ...