There are times when you don’t what to return a complete set of records. When you have this kind of requirement to only select the TOP X number of items Transact SQL (TSQL) has the TOP clause to meet your needs. In this article Greg Larsen explores how to select a subset of data from a record set.
2015-04-16
9,580 reads
Spatial Data in SQL Server has special indexing because it has to perform specialised functions. It is able, for example, to break down an indexed space into a grid hierarchy by using a technique called tessellation. This is a rules-based system that, when you compare a shape to an index, works out how many cells in the the grid hierarchy are touched by that shape , and how deep down the grid hierarchy to search. There is powerful magic in Spatial Indexes as Surenda and Roy explain.
2015-04-15
7,242 reads
Aaron Bertrand presents a more elegant to prevent developers from attempting to log into production databases using application logins (and to log any such attempts).
2015-04-14
7,318 reads
It is always bad news if your SQL queries are having to use the SORT operator. It is worse news if you get a warning that sort operations are spilling onto TempDB. If you have a busy, slow TempDB, then the effect on performance can be awful. You should check your query plans to try to eliminate SORTs and never leave a SORT warning unheeded. Fabiano Amorim shows the range of ways of getting information on what is going on with a query that is doing a SORT and when requests are made for memory.
2015-04-13
8,822 reads
Was the marketing hook 'The Internet of Things' conjured up before the technical definition? Are we being persuaded to spend money on fending off yet another fantasy tsunami of data? Already, we have televisions that listen to, and report, your conversations; so are we facing the Science Fiction future of gadgets that report where you go, who you visit and what medications you take? As Robert Sheldon says; "It's big, almost too big to get your arms around".
2015-04-10
11,037 reads
If you have a reporting requirement where users want to enter report parameters by either selecting values from a dropdown list or entering To and From range values, Ghanesh Prasad explains how to accomplish this in a Reporting Services report?.
2015-04-09
9,591 reads
Refactoring a database object can often cause unexpected behavior in the code that accesses that object. In this article, adapted from his excellent book, Defensive Database Programming with SQL Server, Alex Kuznetsov discusses several techniques that will harden your code, so that it will not break, or behave unpredictably, as a result such changes.
2015-04-08
11,414 reads
In this tip, Daniel Farina explains an unconventional way of deleting millions of old records from a table which is accessed by a system 24x7, and without impacting that system.
2015-04-07
10,661 reads
More and more applications require the handling of geospatial data. It is easy to store spatial data, but it takes rather more thought to retrieve and manipulate it. Tasks like searching neighborhoods, and calculating distances between points is often required from databases. But how do you start? Roy and Surenda take you through the basics.
2015-04-06
9,426 reads
The Azure Active Directory Graph API enables some interesting scenarios that you can implement in your applications by enabling you to query and manipulate directory objects in Azure AD. In this article, Rick Rainey provides a clear walkthrough of its implementation.
2015-04-03
6,836 reads
By Brian Kelley
I am guilty as charged. The quote was in reference to how people argue...
By Steve Jones
Learn how to tie a bowline knot. Practice in the dark. With one hand....
By HeyMo0sh
As a DevOps practitioner, I’ve always focused on performance, scalability, and automation. But as...
Hi, I have a SQL Server instance where users connect to via Windows Authentication,...
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I have a query from a former DBA that we run on SQL Server 2025 to check on database metadata. This query references sys.sysaltfiles. I want to refactor this code to be more modern. Which DMV should I reference instead?
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