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SQL Server 数据库引擎可处理对多种数据存储体系结构(例如,本地表、已分区表以及分布在多个服务器上的表)执行的查询。 以下部分介绍了 SQL Server 如何处理查询并通过执行计划缓存来优化查询重用。执行模式SQL Server 数据库引擎可使用两种不同的处理模式处理 Transact-SQL 语句:...
SQL Copy DROP INDEX IX_Document_Title ON Production.Document; GO Index with included columns guidelinesWhen you design nonclustered indexes with included columns consider the following guidelines:Nonkey columns are defined in the INCLUDE clause of the CREATE INDEX statement. Nonkey columns ...
适用于:SQL ServerAzure SQL 托管实例 跟踪标志用于设置特定服务器特征或更改特定行为。 例如,跟踪标志 3226 是一种常用的启动跟踪标志,可取消显示错误日志中的成功备份消息。 跟踪标志通常用于诊断性能问题或调试存储过程或复杂计算机系统,但也可能建议Microsoft 支持部门解决对特定工作负荷产生负面影响的行为。 当按照指示...
You use the Transact-SQL BULK INSERT statement, or the OPENROWSET(BULK) function, or you use one of the Bulk Insert API commands such as .NET SqlBulkCopy, OLEDB Fast Load APIs, or the ODBC Bulk Copy APIs to bulk copy data into a table. The TABLOCK hint is specified or...
Starting with SQL Server 2016 (13.x), fast inserts are enabled by default, using minimal logging when database is in simple or bulk logged recovery model to optimize insert performance for records inserted into new pages. With fast inserts, each bulk load batch acquires new extents bypassing ...
SQL Server Transact-SQL Index .NET Framework error occurred during execution of user-defined routine or aggregate "geography" 'IF EXISTS(SELECT COUNT(1))' VS 'IF EXISTS(SELECT 1) ' 'Incorrect syntax near' error while executing dynamic sql 'INSERT EXEC' within a function did not work 'Sort...
SQL -- Determining the amount of free space in tempdbSELECTSUM(unallocated_extent_page_count)AS[free pages], (SUM(unallocated_extent_page_count)*1.0/128)AS[freespaceinMB]FROMtempdb.sys.dm_db_file_space_usage;-- Determining the amount of space used by the version storeSELECTSUM(version_store...
Информация, предоставляемаякорпорацией O'Reilly Media, Inc. корпорацииМайкрософт: Развернутьтаблицу Information Отклик Названиеприложения ОтветыО'Рейли ...
I'll use SQL injection to send commands to the database server and ask it to do things for us. Note that I cannot connect directly to the database server, so instead I will ask it to make a connection to me. I'll begin by setting up a listener on the external network, and then...