Applies to: SQL Server 2008 (10.0.x) and later versions, Azure SQL Database, Azure SQL Managed Instance The following example shows how to mark a transaction. The transaction CandidateDelete is marked. SQL Copy BEGIN TRANSACTION CandidateDelete WITH MARK N'Deleting a Job Candidate'; GO USE ...
For example, using the Microsoft® OLE DB Provider for SQL Server to access a database on Microsoft SQL Server 2000, you can create multiple nested transactions for the commands you execute.ADO ensures that changes to a data source resulting from operations in a transaction occur successfully ...
当使用BEGIN TRANSACTION开始一个事务时,SQL Server 会自动创建一个保存点(Savepoint),可以使用ROLLBACK回滚到该保存点。 下面是一个使用嵌套事务的示例代码: BEGINTRANSACTION;INSERTINTOCustomers(FirstName,LastName,Email)VALUES('John','Doe','john.doe@example.com');SAVETRANSACTIONSavePoint1;UPDATEOrdersSETStatus...
A minimally logged operation is performed in the database; for example, a bulk-copy operation is performed on a database that is using the Bulk-Logged recovery model. Database files have been added or removed by using ALTER DATABASE. An instance of SQL Server is stopped by a SHUTDOWN sta...
The example below shows how this may occur. Assume the two transactions below are executing at the same time. The two SELECT statements in the first transaction may return different results because the INSERT statement in the second transaction changes the data u...
In SQL Server 2000, the new request would not be granted, because, under its stricter FIFO implementation, new requests could not be granted until all previously made requests had been granted. In the following example, connections 1 and 3 would be granted when run against SQL Server 2005 in...
For example, given this DELETE statement: SQL Copy DELETE mytable WHERE name = 'Bob'; An exclusive (X) lock is placed on the index entry corresponding to the name Bob. Other transactions can insert or delete values before or after the row with the value Bob that is being deleted. ...
To verify this exact cause, run the DBCC OPENTRAN command while you're connected to the SQL Server CDC database. You'll see a non-distributed LSN number as shown in the following example: Console Kopiraj Replicated Transaction Information: Oldest distributed LSN : (0:0:0) Oldest non-distr...
In the ATM withdraw example, the SQL Server Engine will commit the overall transaction, including the amount deduction from the bank account, when all the steps are performed successfully, and the money received by the user. To handle the concurrency, the SQL Server Engine holds a lock on the...
The following example shows the effect of rolling back a named transaction. After you create a table, the following statements start a named transaction, insert two rows, and then roll back the transaction named in the variable@TransactionName. Another statement outside of the named transaction in...