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1. What is a transaction: a transaction is an indivisible working logical unit that is used as the smallest control unit when performing concurrent operations on a database system. All of the database operations commands he contains are either

Here are a few of my statistical options: first Scenario (recursive): The simple table structure is: CategoryID Int (4), CategoryName nvarchar (50), ParentID Int (4), Depth Int (4) In this way, according to the parentid level of the use of

server| distributed Tests on whether SQL Server 2000 and SQL Server 2005 distributed transactions work togetherMS DTC 1. MS DTC Background 2. The purpose of the MSDTC test 3. MSDTC test Environment 3.1 Verification test Environment: 3.2 Environment

ACID properties of a transactionatomicity Atomic NatureEach transaction works as an atomic unit (that is, it can no longer be split), which means that all databases change transactions, either successfully or unsuccessfully.SQL Server considers each

1. BusinessIn 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 boundariesShow definition transaction begin TRAN If you

From:http://www.cnblogs.com/kissdodog/p/3169788.htmlThe 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

When talking about deadlocks in data, we have already encountered these deadlocks in the exam. Today, I would like to make a summary of database deadlocks!I. First, let's look at several definitions: 1. deadlock: a deadlock occurs when two or more

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

This section describes SQL statements, sqltransaction, and transactionscope. All examples in this section run in SQL Server 2008 and vs 2008 environments. If SQL Server 2005 is not available, the same applies to SQL Server, however, SQL se rver 2000

SQL Server database, how to add s lock or X lock to data items 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

This section describes SQL statements, SqlTransaction, and TransactionScope. All examples in this section are run in sqlserver2008 and vs2008 environments. If sqlserver2008 is not available, the same applies to sqlserver2005, but sqlserver2000

Several lock problemsI: Yujohny) 1. How to lock a row in a table SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED SELECT * FROM table rowlock where id = 1 2. Lock a table in the database SELECT * FROM table WITH (HOLDLOCK) Lock

Under the default transaction isolation level: The X lock under insert, update, and delete will wait until the transaction is completed.The S lock under the SELECT statement is released after the query is complete. Lock Overview I. Why should

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

Transactions are all about atomicity. The concept of Atomicity refers to the ability to treat things as a unit. From the database perspective, it refers to the minimum combination of one or more statements that should be executed or not executed at

When executing a stored procedure, we often encounter execution timeout. If there are too many data to be processed and the modification process is complicated, use the following methods to solve the problem: Add transaction management to

1. instance reproduction of four types of transaction concurrency problems in SQL Server Zhu Er (2006.3 reproduced please note the author) http://blog.csdn.net/netcoder/article/details/633153This articleArticleIt will use instances to reproduce

A transaction is an inseparable logical unit of work. It is used as the smallest control unit to execute concurrent operations on the database system. A transaction is an inseparable logical unit of work. It is used as the smallest control unit to

There are many infinite classification types on the network, but there are only two types: recursive algorithm and non-recursive algorithm .. There are many infinite classification types on the network, but there are only two types: recursive

Overview of the Lock Why should I introduce a lock?Concurrent operations on a database by multiple users can cause the following data inconsistencies: Missing updatesA,b two users read the same data and make changes, one of the user's changes to