commit tran

Server|sqlserver first, starting from the error in SQL Server, there are some strange error-handling errors at the same level as 16 but the results are different. SELECT * from an absent table if @ @error print ' This has no output ' Go

This article uses six points to describe SQL lock usage overview. If you need to know about mssql locks, you can refer to this article for details. This article uses six points to describe SQL lock usage overview. If you need to know about mssql

I. Simple Syntax of transactions used in Stored Procedures It is very important to use transactions in the stored procedure. Using data can maintain the integrity of the data association. It is also very easy to use transactions in the stored

Lock Overview   I. Why should I introduce locks?   When multiple users perform concurrent operations on the database, the following data inconsistency occurs:   Update loss A and B read and modify the same data. The Modification result

The transaction is about atomicity. The concept of atomicity means that some things can be viewed as an inseparable unit. From a database point of view, it refers to the smallest combination of one or more statements that should be executed all or

Under the SQL Server standard read COMMITTED isolation level, a read operation is blocking each other from a write operation. Uncommitted read (READ UNCOMMITTED) Although there is no such blocking, read operations may read dirty data, which is

***************Set Table1 (A, B, C)A B CA1 B1 C1A2 B2 C2A3 B3 C3 1) exclusive lockCreate two connectionsExecute the following statement in the first connection:Begin tranUpdate Table1Set a = 'A'Where B = 'b2'Waitfor delay '00: 00: 30' -- wait 30

SQL ServerMedium DatabaseTransaction ProcessingIs quite useful, given that many SQL beginners write Transaction ProcessingCodeVulnerabilities often exist. This article introduces three different methods to illustrate howStored ProcedureWrite the

Lock Overview I. Why should I introduce locks? When multiple users perform concurrent operations on the database, the following data inconsistency occurs: Update lossA and B read and modify the same data. The Modification result of one user destroys

The transaction is about atomicity. The concept of atomicity means that some things can be viewed as an inseparable unit. From a database point of view, it refers to the smallest combination of one or more statements that should be executed all or

The transaction is all about atomicity. The concept of atomicity means that some things can be viewed as a unit. From a database perspective, it refers to the smallest combination of one or more statements that should be executed all or none of them.

Let's take a look at the transaction processing technology in this article.Why use a transaction, what is the use of a transaction, for instance.Suppose we now have a business, as the success of something to the 2 table to insert data, a table, B

1. Business In SQL Servce, a transaction is a unit of work that may contain queries and modify data, as well as modify data definitions, and can also display or implicitly define transaction boundaries Show definition transaction begin TRAN If you

Lock Overview I. Why should I introduce locks? When multiple users perform concurrent operations on the database, the following data inconsistency occurs: Update lossA and B read and modify the same data. The Modification result of one user

Lock Overview I. Why should I introduce locks?When multiple users perform concurrent operations on the database, the following data inconsistency occurs: Update lossA and B read and modify the same data. The Modification result of one user destroys

SQL Server insert efficiency (heap table vs clustered index table) "Which of the following is more efficient for SQL Server insert operations in heap tables or clustered index tables? Why is it high ?" Some colleagues have asked me this question

I. Why should I introduce locks? When multiple users concurrently perform database operations, the following data inconsistency occurs: ◆ Update loss A and B read and modify the same data. The Modification result of one user destroys the

------------------------------------------------ Transaction control ----------------------------------------------------- SQL Server 2005/2008 provides begin Tran, commit Tran, and rollback Tran to use transactions.Begin Tran indicates that the

SQL Server lock type (SQL) favorites1. holdlock: Keep the shared lock on the table until the entire transaction ends, instead of releasing the added lock immediately after the statement is executed.2. nolock: no shared or exclusive locks are added.

I. Why should I introduce locks?When multiple users perform concurrent operations on the database, the following data inconsistency occurs:Update lossA and B read and modify the same data. The modification result of one user destroys the