SELECT * FROM TABLE WIHT(NOLOCK) SELECT * FROM TABLE_A AS a WIHT(NOLOCK) LEFT JOIN TABLE_B AS b WIHT(NOLOCK) ON a.ID=b.ID 2.关于在视图上使用WITH(NOLOCK) SELECT * FROM V_XXX WIHT(NOLOCK) 简而言之:查询视图的时候,使用WITH(NOLOCK),可以
对一个有聚簇索引的表来说是一个键查找(key lookup),对一个堆表来说是一个RID查找(RID lookup),这种查找即是——书签查找(bookmark lookup)。简单的说就是当你使用的sql查询条件和select返回的列没有完全包含在索引列中时就会发生书签查找。 解决方案:这种死锁可以通过Include列来减少书签查找,从而减少这种类型...
这里的with()叫做语句提示，即告诉数据库引擎要以什么方式查询表 nolock是不加锁查询，可以读取被事务锁定的数据，也称为脏读 http://wenku.baidu.com/view/8e42e42bbd64783e09122be6.html
EXEC sp_create_plan_guide @name = N'Guide7', @stmt = N'SELECTc.LastName, c.FirstName, e.TitleFROMHumanResources.EmployeeASeWITH(NOLOCK,INDEX(PK_Employee_EmployeeID))JOINPerson.ContactAScONe.ContactID = c.ContactIDWHEREe.ManagerID =2;', @type = N'SQL', @module_or_batch = NULL, ...
INSERT INTO Orders (UserName,Total) VALUES ('John', 12.50) SELECT * FROM Orders WITH(NOLOCK) where UserName = 'Viktar' Conclusion:If you have blocking issues try to eliminate them, but this is not always so simple. If you can not get rid of the severe blocking issues, see if using...
2 查看各表数据记录数量SELECT dbo.sysobjects.name As TableName,id As TableId, (Select top 1 rowcnt From dbo.sysindexes with (nolock) Where id=dbo.sysobjects.id) As RecordCount, ISNULL(E.name,'') As PropertyName, ISNULL(E.value,'') As PropertyValue FRO...
问使用SELECT和HAVING语句中的COUNT优化T-SQL查询ENWhere 是一个约束声明，使用Where约束来自数据库的数据...
Use AdventureWorks2022; GO BEGIN TRAN; SELECT APPLOCK_MODE('public', 'Form1', 'Transaction'); --Result set: NoLock SELECT APPLOCK_TEST('public', 'Form1', 'Shared', 'Transaction'); --Result set: 1 (Lock is grantable.) SELECT APPLOCK_TEST('public', 'Form1', 'Exclusive', 'Trans...
"SELECT INTO" with indexes? "Simple" SQL to check for alpha or numeric charcters isn't working right "String or binary data would be truncated.\r\nThe statement has been terminated." "String or binary data would be truncated" and field specifications “Unable to enlist in the transaction”...
2、确保是复制在相应的数据库上执行的新增查询编辑区域编辑脚本编辑分段落如上图的排比形式替换1、top 1 1 as counter 为 *替换2、union 为 “空格”替换3、with (nolock) 为 “空格”执行脚本确认选中的是所要执行的数据库名称执行后,会看到有不为空的 查询结果集。上图示例,是第二条语句的结果修改脚本se...