begin tran

Atitit... trigger Mechanism ltriggermechanic ismsumup. o8f1. trigger Type 12. implementation Principle 13. after trigger VsInsteadOf trigger 14. DML trigger VsDDL trigger 35. trigger and transaction 36. the following describes the transactions in

Atitit... Summary of the trigger mechanism ltrigger mechanic sumup. O8f, ltriggero8f Atitit... Summary of the trigger mechanism ltrigger mechanic sumup. O8f   1. Trigger type 1 2. Implementation Principle 1 3. After trigger Vs Instead Of trigger 1 4.

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

After careful study, it is still a bit complicated to find the explicit transaction (display transaction) inside SQL Server. Here are some summaries:Commit TRANSACTION commits all nested transaction modifications. However, if the nested transaction

NOLOCK (without lock)When this option is selected, SQL Server does not add any locks when reading or modifying data. In this case, it is possible for the user to read the data in the incomplete transaction (uncommited Transaction) or rollback (roll

Understanding Transactions and LocksTransactions: The essential tool for maintaining logical data consistency and recoverability.Lock: When multiple users access the same database resource, a mechanism for the priority authority management of access,

The Study of the lock mechanism requires two conditions: 1. Large Data Volume 2. If multiple concurrent users lack these two conditions, the database is not prone to deadlock. It may take half the effort for research. If both conditions are met, but

From: http://blog.csdn.net/missmecn/archive/2008/10/06/3019798.aspx related articles: MySQL database lock Several lock modes in Oracle Recommendation circle:Pipboy More related recommendations The Study of the lock mechanism requires two

1. Handle deadlocks and set deadlock priority A deadlock occurs when multiple users apply for different blockages. The applicant has part of the blockages and waits for the blockages of other users. Set deadlock_priority can be used to control

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

SELECT * FROM dbo. AaSELECT * FROM dbo. B--1. Exclusive lock--no changes or additions to the search.-This is the database itself, in order to appear data confusion, dirty data processing mechanism of their own--Connection 1BEGIN TranUPDATE dbo. BSet

Transferred from: http://www.cnblogs.com/knowledgesea/p/3714417.htmlUnderstanding Transactions and LocksTransactions: The essential tool for maintaining logical data consistency and recoverability.Lock: When multiple users access the same database

Transactions are used in the stored procedure. transactions are used in the stored procedure. 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

Directory1. What is an execution plan? The information on which the execution plan depends.2. Unify SQL statement writing to Reduce parsing overhead3. Reduce SQL statement nesting4. Use "temporary table" to save intermediate results5. The SQL

How to handle massive Concurrent Data Operations File Cache, database cache, optimized SQL, data shunting, horizontal and vertical division of database tables, and optimized code structure! Summary of lock statements I. Why should I introduce

This series of articles I saw in the sqlskill.com's PAUL blog, many misunderstandings are more typical and representative, the original from the T-SQL Tuesday #11: Misconceptions about... EVERYTHING !!, After translation and arrangement by our team,

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

Isolation level for SQL Server transactionsDatabase is to be shared by the vast number of customers to access, then in the database operation process is likely to occur in the following kinds of uncertainty.Update missing (Lost update)Two

database transaction processing in SQL Server is an important concept, but also a little bit difficult to understand, many SQL beginners write transaction processing code is often a vulnerability, this article describes three different methods,

1. First, you must understand what an execution plan is? An execution plan is a query solution made by the database based on the statistics of SQL statements and related tables. This solution is automatically generated by the query optimizer, for