同样,把整个table的记录都删除,要记很多log,我们可以用truncate table命令代替上述语句完成相同功能。 1>truncate table large_tab 2>go 这样,表中记录都删除了,而使用truncate table 命令,log只记录空间回收情况,而不是记录删除表中每一行的操作。 基于子查询的数据插入 例: 1>insert new_tab select col1,col2...
INSERT INTO `table1` (`field1`, `field2`) VALUES ("data1", "data2"); INSERT INTO `table1` (`field1`, `field2`) VALUES ("data1", "data2"); INSERT INTO `table1` (`field1`, `field2`) VALUES ("data1", "data2"); INSERT INTO `table1` (`field1`, `field2`) VALUES (...
-- Syntax for SQL Server and Azure SQL Database [ WITH <common_table_expression> [...n] ] UPDATE [ TOP ( expression ) [ PERCENT ] ] { { table_alias | <object> | rowset_function_limited [ WITH ( <Table_Hint_Limited> [ ...n ] ) ] } | @table_variable } SET { column_name...
Applies to: SQL Server 2016 (13.x) and later versions.Scope: Global or session. 715 Enables table lock for bulk load operations into a heap with no nonclustered indexes. When this trace flag is enabled, bulk load operations acquire bulk update (BU) locks when bulk copying data into a ...
Large memory support (up to 16 terabytes). SMP support (up to 64 processors). Support for large Windows Server 2003 Data Center Server clusters. Support for multiple instances of SQL Server 2000 on a single server. Integration with Active Directory to provide location-transparent access to serve...
Limit the execution of DML statements on a wide table that update multiple rows of a clustering key. These statements can require significant memory resources to compile and execute. Switch partition operations on wide tables can be slow and might require large amounts of memory to process. The...
Applies to: SQL Server 2016 (13.x) and later versions.Scope: Global or session. 715 Enables table lock for bulk load operations into a heap with no nonclustered indexes. When this trace flag is enabled, bulk load operations acquire bulk update (BU) locks when bulk copying data into a ...
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在SQL Server 中,索引优化是提高查询性能的重要手段。以下是一个具体的业务场景,假设我们有一个销售订单系统,订单表 Orders 需要根据不同的查询需求来进行索引优化。 业务场景 查询需求1:按 CustomerID 和OrderDate 查询订单信息。 查询需求2:按 ProductID 查询所有相关的订单。 查询需求3:查询某一订单的详细信息(...
If you have batch updates that occasionally affect a large number of rows at the Subscriber, you should consider updating the published table using a stored procedure and publish the execution of the stored procedure. Instead of sending an update or delete for every row affected, the Distribution...