Articles

Technical Article

Accurate Numeric Identifiers: Using Verhoeff's Method for Check Digits

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

External Article

High Call Volume SQL Server Applications on NUMA Systems

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

SQLServerCentral Article

Conducting a SQL Server Operational Audit

Auditing, analyzing and documenting your SQL Server installation is becoming more important all the time, especially as more and more attention is being paid to the security of your environment. Chad Miller brings us a look at a framework and a sample document you can use in your environment to conduct an audit.

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2005-10-24

13,644 reads

Technical Article

VIEWS: The Key to Database Agility

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

SQLServerCentral Article

Have You Been Told Today

SQL Server 2000 has a great job and alert subsystem, but it doesn't do everything. There are times when you want to be notified that something has completed, or not completed. New author Frank Loschiavo brings us a way to ensure that when you run a query you are notified if and when it completes.

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2005-10-20

6,150 reads

Technical Article

The Steps to monitoring greatness

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

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Question of the Day

What is Page Density

In SQL Server, there is a concept of page density. This is determined by how much data is stored on each page. What is a page density of 90%?

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