WITH NOLOCK:无锁 WITH HOLDLOCK:挂一个保持锁 WITH UPDLOCK:挂一个更新锁 WITH XLOCK:挂一个排他锁 需要注意的是 with nolock 是不能用于update,delete insert 这种更新语句的,说绕了。 简单的说 with nolock 只能用于select 例如:update dbo.test with(NOLOCK) set username='wokofo' ——这样的语句是...
许多有经验的数据库开发或者DBA都曾经头痛于并行查询计划，尤其在较老版本的数据库中（如sqlserver2000、...
SQLServer中WITH（NOLOCK）浅析 概念介绍 开发⼈员喜欢在SQL脚本中使⽤WITH(NOLOCK), WITH(NOLOCK)其实是表提⽰（table_hint）中的⼀种。它等同于READUNCOMMITTED 。具体的功能作⽤如下所⽰（摘⾃MSDN）：1：指定允许脏读。不发布共享锁来阻⽌其他事务修改当前事务读取的数据，其他事务设置的排他锁...
[Execute SQL Task] Error: The value type (__ComObject) can only be converted to variables of type Object. [ODBC Driver Manager] Data source name not found and no default driver specified [ODBC SQL Server Driver] Invalid Parameter Number/ Invalid Description or Index [Sql server 2012] Change...
如下所示,CLR表值函数是不能使用WITH(NOLOCK)的。它会提示语法错误。 USE YourSQLDba; 1. GO 1. SELECT * 1. FROM [yUtl].[clr_GetFolderList]('C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA', 1. '*.mdf') WITH(NOLOCK) ...
如下所示,CLR表值函数是不能使用WITH(NOLOCK)的。它会提示语法错误。 USEYourSQLDba; GO SELECT* FROM[yUtl].[clr_GetFolderList]('C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA', '*.mdf')WITH(NOLOCK) Msg 319,Level15,State1, Line 43 ...
Use EXPAND VIEWS if you want to be sure to have SQL Server process a query by accessing data directly from the base tables referenced by the query, instead of possibly accessing indexed views. EXPAND views may in some cases help eliminate lock contention that could be experienced with an inde...
This issue occurs because the NOLOCK hint causes the query to incorrectly read values in the table when the query reads the same values multiple times. Resolution The issue was first fixed in ...
给EF Core 查询增加 With NoLock Intro EF Core 在 3.x 版本中增加了Interceptor,使得我们可以在发生低级别数据库操作时作为 EF Core 正常运行的一部分自动调用它们。 例如,打开连接、提交事务或执行命令时。 所以我们可以自定义一个Interceptor来记录执行的 sql 语句,也可以通过Interceptor来实现 sql 语句的执行。
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