Check digits–not to be confused with checksums–are often added to numeric identifiers such as customer and product numbers to reduce the chance of incorrect entries. Sequences of numbers are notoriously easy to mistype, and constraints alone generally won't do the job. In this excellent article, Lynn Fields shows you how to implement the "Cadillac" of check digit methods–the Verhoeff Dihedral Group.
2005-10-26
2,735 reads
One of the most difficult database operations to scale-up on high-end server systems is the network call. In fact, without special precautions, a high call volume database application can have severe negative scaling on large systems. It is suspected that this problem is more pronounced on NUMA systems than basic SMP systems. A NUMA system with 16 processors can have significantly lower throughput capability than an otherwise comparable 4-way SMP system.
2005-10-25
1,754 reads
There is an important technique for creating truly agile databases that I haven’t seen in his writings; one which is well-known to DBAs, but little understood in the application development community – the use of database views to create a layer of abstraction between the normalized relational tables and the applications that use the data.
2005-10-21
3,736 reads
In this article, I will introduce a significant improvement that underlies the new Analysis Services development approach, the Data Source View. A Data Source View is a design-time object that makes its home in the workbench environment of the Business Intelligence Development Studio.
2005-10-20
2,655 reads
SQL Server Profiler can correlate Microsoft Windows System Monitor (Performance Monitor in Windows NT 4.0) counters with SQL Server or SQL Server 2005 Analysis Services (SSAS) events. Windows System Monitor logs system activity for specified counters in performance logs. The first thing to remember is in order to have correlating information you need to obviously be in sync - in other words you must start the perfmon trace and profiler trace at the same time or else they won't match up.
2005-10-19
2,508 reads
Database geeks are all around us. I met Gary Mallow on the email list of a cycling group run by a local church. After some conversation, I discovered that he is a director of a group of developers who build applications, sometimes using .NET and often using Oracle as a database. Like me, Gary is not entirely comfortable with his ability as a UI developer, and so finds database work a good fit.
2005-10-18
1,689 reads
In the preceding articles of this series, Lock Granularity, Transactions, and ACID were introduced. Common lock types, such as Shared, Exclusive, and Update were explored, as well as using SP_Lock to obtain current system lock information. In this article, the normal internal SQL locking methods will be manipulated using Lock Hints in order to obtain finer lock control.
2005-10-14
4,123 reads
Have you ever had a need to run a query or a process as soon as SQL Server starts? Or run some set of tasks when SQL Server Agent Starts? Possibly you want to run a cleanup routine, a copy process or have some task started each time SQL server or SQL Agent is started. Well if this is the case then this article will discuss a couple of options you might consider using to accomplish automatically running your process.
2005-10-13
2,228 reads
Itzik Ben-Gan is a writer and mentor in the development community. He writes a monthly column for SQL Server Magazine and co-authored Advanced Transact-SQL for SQL Server 2000 . He is one of the founders of Solid Quality Learning, a global provider of education and solutions for the Microsoft database platform, and serves as its principal mentor.
2005-10-12
2,399 reads
One thing Access developers love about using SQL Server as the back end is that it is easy to do maintenance. I can't tell you how many times I toured around an office, looking for users who had their client open and connected to the data so I could ask them to log out. Too many times, the offender was at lunch or away from their desks, with their desktops locked.
2005-10-11
3,496 reads
Welcome back, my fellow sleuths, to my mystery-inspired blog series! I’m having a ton...
By Steve Jones
This was one of the original values: The facing page has this text: No...
By Chris Yates
For decades, enterprises have thought about data like plumbers think about water: you build...
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Hi everyone I have a 1000 plus line query and I am getting an...
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DECLARE @s VARCHAR(1000) = 'apple, pear, peach' SELECT * FROM STRING_SPLIT(@s, ', ')See possible answers