Additional Articles


External Article

In-Memory OLTP: Row Visibility in SQL Server’s MVCC

SQL Server's In-memory OLTP is fast, due to its multi-valued concurrency control (MVCC). MVCC avoids the need for locks by arranging for each user connected to the database to see a snapshot of the rows of the tables at a point in time, No changes made by the user will be seen by other users of the database until the changes have been completed and committed. It is conceptually simple but does the user always see the correct version of a row under all circumstances? Shel Burkow explains.

2016-10-17

3,150 reads

External Article

DELETE Operation in SQL Server HEAPs

You should stick to using tables in SQL Server, rather than heaps that have no clustered index, unless you have well-considered reasons to choose heaps. However, there are uses for heaps in special circumstances, and it is useful to know what these uses are, and when you should avoid heaps. Uwe Ricken explains, and demonstrates why you'd be unwise to use heaps rather than tables when the data is liable to change.

2016-10-14

3,646 reads

External Article

Going Interactive with C#

For some time now, C# programmers have gazed enviously at the interactive capabilities of F#, Python and PowerShell. For rapid prototyping work and interactive debugging, dynamic languages are hard to beat. C# Interactive slipped into view quietly, without razzmatazz, in Visual Studio 2015 Update 1. It's good, it's worth knowing about; and Tom Fischer is intent on convincing you of that.

2016-10-11

5,674 reads

External Article

Azure SQL Database - Azure AD Authentication

One of the challenges when considering migrating your on-premises SQL Server databases to Azure SQL Database is its lack of support for Active Directory-integrated authentication. With the advent of Azure SQL Database V12, the authentication capabilities have been expanded, allowing for more flexibility that leverages Azure Active Directory. In this article, Marcin Policht provides an overview of this functionality.

2016-10-10

3,995 reads

External Article

Taking Pictures from HTML

Sometimes a request from a user who doesn't appreciate the limitations of the technology can jolt you into discovering that an application feature that was, until recently, difficult to achieve is suddenly relatively easy. Dino was asked to allow the user to take photographs and associate them with an item of work. After he'd recovered from the shock, he decided that it was achievable, and now describes how he went on and did it.

2016-10-06

4,818 reads

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Question of the Day

Multiple Values Inserted

I have this code on SQL Server 2022. What happens when it runs all at once?

DROP TABLE IF EXISTS dbo.Commission
GO
CREATE TABLE dbo.Commission
(id INT NOT NULL IDENTITY(1,1) CONSTRAINT CommissionPK PRIMARY KEY
, salesperson VARCHAR(20)
, commission VARCHAR(20)
)
GO
INSERT dbo.Commission
( salesperson, commission)
VALUES
( 'Brian', 12 ),
( 'Brian', 'None' )
GO
 

See possible answers