For more information about SQL Server isolation levels, see "Isolation Levels in the Database Engine" in SQL Server Books Online. See also Performing transactions with the JDBC driver SET TRANSACTION ISOLATION LEVEL (Transact-SQL) Feedback
切换回窗口2发现插入成功,插入后返回13条记录,为了下面的实验删除插入的新纪录 5.Snapshot Isolation Levels(SNAPSHOT 和READ COMMITTED SNAPSHOT) Sql server 2005开始兼容将记录的前一个版本存入tempdb的模式,基于记录版本技术,Sql server增加了对SNAPSHOT 和READ COMMITTED SNAPSHOT的支持。SNAPSHOT功能和SERIALIZABLE ...
Assembly: Microsoft.SqlServer.TransactSql.ScriptDom.dll Package: Microsoft.SqlServer.TransactSql.ScriptDom v161.8901.0 Isolation levels for SET TRANSACTION ISOLATION LEVEL command C# 복사 public enum IsolationLevel Inheritance Enum IsolationLevel Fields 테이블 확장 NameValueDescription ...
如果你不想读到脏数据,那么你需要更高级别的隔离层级,防止读到脏数据的的最低隔离层级就是READ COMMITTED ,它也是所有版本的Sql Server读操作时的默认隔离层级.顾名思义,这个层级只允许读取已经提交过的数据。这就是说如果更新一行的事务还没有结束时试图读取该行的操作将被Block(只能等待更新事务结束unblock), 因...
SQL Server Native Client catalog procedures Dynamic management views and functions For more information about isolation levels, see SET TRANSACTION ISOLATION LEVEL (Transact-SQL).The following table provides a summary of metadata access under various isolation levels.توسيع الجد...
For more information about isolation levels, see 数据库引擎中的隔离级别. For more information about the available values, see the IsolationLevel enumerations that are used in the System.Data namespace, in ADO and in OLE DB. The following table lists the values that are available for the ...
Database Engine Isolation Levels The ISO standard defines the following isolation levels, all of which are supported by the SQL Server Database Engine: Read uncommitted (the lowest level where transactions are isolated only enough to ensure that physically corrupt data is not read) ...
Table 1. Read Uncommitted database types and equivalent isolation levels Database type Equivalent isolation level Oracle Not applicable Db2 Uncommitted read Microsoft SQL Server Read uncommitted Sybase Adaptive Server Enterprise Read uncommitted Informix® Dirty read Read Committed A tran...
This is the least restrictive of the isolation levels.In SQL Server, you can also minimize locking contention while protecting transactions from dirty reads of uncommitted data modifications using either:The READ COMMITTED isolation level with the READ_COMMITTED_SNAPSHOT database option set to ON. ...
Table 4. Reproducible read databases and equivalent isolation levels DatabaseEquivalent isolation level Oracle Not applicable Db2 Read stability Microsoft SQL Server Repeatable read Sybase Adaptive Server Enterprise Repeatable read Informix Repeatable read ...