Locking

Technical Article

Transaction locking and row versioning guide

  • Article

In any database, mismanagement of transactions often leads to contention and performance problems in systems that have many users. As the number of users that access the data increases, it becomes important to have applications that use transactions efficiently. This guide describes the locking and row versioning mechanisms the SQL Server Database Engine uses to ensure the physical integrity of each transaction and provides information on how applications can control transactions efficiently.

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2022-10-05

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Question of the Day

Subqueries II

What is wrong (if anything) with this code?

SELECT *
 FROM Sales.SalesOrderHeader AS soh 
 WHERE customerid IN (SELECT soh.CustomerID 
                       FROM Sales.Customer AS C
   WHERE soh.CurrencyRateID = 1
   ORDER BY c.ModifiedDate)

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