rollback tran

TransactionThe so-called transaction is a user-defined series of database operations, which are either fully executed or not executed at all, and are an inseparable unit of work. For example, in a relational database, a transaction can be an SQL

In the process of writing stored procedures will inevitably encounter proc and cross-Library calls to other people proc, there is a proc in a number of multiple tables to write and modify the statement. Then we'll use the tran.If we're going to

A trigger is a special type of stored procedure that differs from the stored procedure we described earlier. Triggers are triggered primarily by an event that is automatically invoked to execute. The stored procedure can be called by the name of the

A trigger is a special type of stored procedure that differs from the stored procedure we described earlier. Triggers are triggered primarily by an event that is automatically invoked to execute. The stored procedure can be called by the name of the

SQL Server Performance Analysis-deadlock detection database blocking statementsWork in the database often appear in memory, found an articleRefer to Csdn, China Wind (Roy) A deadlock article block: One of the transactions is blocked, other

A trigger is a special type of stored procedure that differs from the stored procedure we described earlier. Triggers are triggered primarily by an event that is automatically invoked to execute. The stored procedure can be called by the name of the

What is a triggerA special stored procedure that is automatically executed when a trigger inserts, updates, or deletes a table. Triggers are typically used on more complex constraints of check constraints. The difference between a trigger and a

Characteristics of a transactionAtomicity: Either all executes, or none of them executes.Consistency: When a transaction completes, all data remains in a consistent state.Isolation: A concurrent transaction either modifies the state before another

A trigger is a special type of stored procedure that differs from the stored procedure we described earlier. Triggers are triggered primarily by an event that is automatically invoked to execute. The stored procedure can be called by the name of the

Transactions and locks in the database ACID properties of a transaction 1,A (atomicity) atomicity The transaction must be an atomic unit of work, or all of its data modifications, or none of them executed. 2,C (consistency) Consistency When a

1. Scalar function: The result is a single value that can contain the logical processing process. It is not possible to use nondeterministic system functions such as GETDATE (). Copy Code code as follows: --Scalar value function -- ====

A trigger (trigger) is a method that SQL Server provides to programmers and data analysts to ensure data integrity. It is a special stored procedure associated with a table event, and its execution is not invoked by the program or initiated manually,

asp.net| data Many database operations need to be transacted, and there are roughly 3 levels of transactions under ASP.net: (1) Transaction at the level of the stored procedure (2) Ado.net-level transactions (3) asp.net transaction at the page level

It is recommended that you read the stored procedure first:SQL Server Stored ProceduresØ BusinessIn a database, it is sometimes necessary to run instructions from multiple steps as a whole that either succeeds or fails altogether, which requires a

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,

A trigger is a special type of stored procedure that differs from the stored procedure we described earlier. Triggers are triggered primarily by an event that is automatically invoked to execute. The stored procedure can be called by the name of the

1. Simulate a deadlock first:1 CREATE TABLELock1 (C1int default(0));2 CREATE TABLELock2 (C1int default(0));3 INSERT intoLock1VALUES(1);4 INSERT intoLock2VALUES(1);5 6 --put the following code into the two Query Analyzer windows, respectively:7

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

A trigger is a special type of stored procedure that differs from the stored procedure we described earlier. Triggers are triggered primarily by an event that is automatically invoked to execute. The stored procedure can be called by the name of the

(1) Stored procedures[1] Creating a stored procedure (no parameters)CREATE PROCEDURE ProtestaAsSELECT * FROM TestA--Modify the stored procedure (with parameters as output)Alter PROCEDURE Protesta@LastName varchar = NULL outputAsIf @LastName is