begin tran

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

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

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

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

Myth #26: There is a real "transaction nesting" in SQL ServerError Nested transactions do not appear to allow transaction nesting as their syntax behaves. I don't know why anyone would write code like that, and the only thing I could think of was a

V. Lock and TRANSACTION isolation levelsTransaction ISOLATION level The simple thing is that when the transaction is activated, the control transaction causes the locking of the SQL statement to be kept multiple, and the extent of the impact, in

SQL Server shared lock, exclusive lock, update lock use previous/next 2009-11-08 00:29:17/personal Category: DatabaseView (889)/comment (0)/rating (0/0)Overview of LocksI. Why to introduce a lockConcurrent operations on a database by multiple users

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

A stored procedure in Transact-SQL, very similar to a method in the Java language, can be called repeatedly. After the stored procedure executes once, the statement can be cached so that the statements in the cache are used directly at the next

The example in this article describes the method of writing transactions in SQL Server stored procedures. Share to everyone for your reference, specific as follows: database transactions in SQL Server are quite useful, and since many SQL beginners

Directly cut the topic. There is A table in the table: ChenJiID, DanWeiID, Name, and ChenJi. The IDDanWeiIDNameChenJi ---------------------------- the consumer opens two connections in the query analyzer to connect A to begintrant. There is a table

simple syntax for using transactions in a stored procedureWhen using transactions in a stored procedure, it is important to use the data to maintain the associated integrity of the data, and it is simple to use the transaction in a SQL Server stored

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

What is an execution plan? The information on which the execution plan depends. 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

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

If you are using an sqlserver database! You don't want to use background operations. you can see the following operations on text. write operation (WRITETEXT) here, the commonly used function is TextPtr to obtain the pointer of the text field, and

What is an execution plan? The information on which the execution plan depends. 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

SQL lock mechanism advanced Before reading this article, I would like to briefly introduce the locks and translate several specialized words. What is a lock? SQL Server 2000 uses locks to implement synchronization control when multiple users modify

Strategy a property of a transaction Transactions have ACID properties: Atomic atomicity, consistent consistency, isolated isolation, durable permanent Atomicity is that a transaction should be a unit of work, the transaction completes, all work is

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