Category: SQL Server Database Engine

Life, SQL Server Database Engine

Upcoming webinar: CI and CD with SSDT and Living to Tell About It

Unfortunately, due to unforeseen circumstances, the webinar had to be delayed to a later date. I’ll post an update as soon as a new date will be scheduled. I’m delivering an upcoming webinar in PASS Global Hebrew Virtual Group: CI and CD with SSDT and Living to Tell About It, on September 25th, 17:00 Israel Standard Time (GMT+3) Details and registration: https://globalhebrew.pass.org/MeetingDetails.aspx?EventID=14256 Meet SSDT (SQL … Continue reading Upcoming webinar: CI and CD with SSDT and Living to Tell About It

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SQL Server Database Engine

#TSQL2sday : I wish SQL Server had better Table Partitioning

For this month’s T-SQL Tuesday, Kevin Chant asked us to dream up our fantasy SQL Server feature.

The feature I wish we had is Table Partitioning, but… Better. Unfortunately, the feature by large remained the same way since its release in 2005, without any meaningful improvements (besides some parallelism and statistics maintenance improvements).

But I think Microsoft can do much better. Continue reading #TSQL2sday : I wish SQL Server had better Table Partitioning

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Joins
SQL Server Database Engine, SQL Server Performance

The LOOP, HASH and MERGE Join Types

Today I’ll talk about the available JOIN operator types in SQL Server (Nested Loops, Hash and Merge Joins), their differences, best practices and complexity. For the samples in this post, we’ll use the free AdventureWorks database sample available here: http://msftdbprodsamples.codeplex.com/releases/view/4004 Introduction: What are Join Operators? A join operator is a type of an algorithm which the SQL Server Optimizer chooses in order to implement logical … Continue reading The LOOP, HASH and MERGE Join Types

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SQL Server Database Engine

The "IGNORE_DUP_KEY" option in Primary Keys and Unique Indexes

Unlike foreign keys, primary keys and unique indexes cannot be “untrusted”. There’s no “NOCHECK” option for unique constraints. The closest there is, is the “ignore_dup_key” option. “Hmm… That sounds interesting”, you must be thinking. But let me stop you right there, buddy. Read this before you go off doing something potentially dangerous… Very, VERY dangerous. But it does NOT mean that you can create such … Continue reading The "IGNORE_DUP_KEY" option in Primary Keys and Unique Indexes

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SQL Server Database Engine, SQL Server Performance

The Curious Case of Collations and Performance in SQL Server

One fateful night, cold and dreary, I’ve stumbled upon an apparently little known fact about SQL Server – specifically SQL Server collations and how they affect performance… Yes, really!

While normalizing a table in their database, one of my clients had weird and inconsistent performance problems and couldn’t find a solution for it for quite a while. Continue reading The Curious Case of Collations and Performance in SQL Server

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SQL Server Database Engine, Tools and Scripts

Using Reporting Services as your Software Frontend

CREATE PROCEDURE MoveEmployeesFromManagerToManager @SourceManagerID INT, @DestinationManagerID INT AS DECLARE @RCount INT DECLARE @Output AS TABLE ( Msg NVARCHAR(MAX) ) BEGIN TRY INSERT INTO @Output VALUES( N’Moving employees from ManagerID ‘ + CONVERT(nvarchar(50), @SourceManagerID) + ‘ to ManagerID ‘ + CONVERT(nvarchar(50), @DestinationManagerID) + ‘…’ ) BEGIN TRANSACTION UPDATE Employees SET ManagerID = @DestinationManagerID OUTPUT N’Moved EmployeeID ‘ + CONVERT(nvarchar(50), INSERTED.EmployeeID) INTO @Output FROM HumanResources.Employee AS Employees … Continue reading Using Reporting Services as your Software Frontend

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