The idea of grid computing is to use many inexpensive devices to provide the total resources required, thereby providing intrinsic redundancy (if one device fails, replace it) and scalability (add more devices as the load increases). This is similar to the concept used with RAID. Grid Computing,
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Flashback Technology: Recovering from Human Errors
According to many studies, 40% of application outages are caused by operator or user errors. Part of being human is making mistakes. But these errors are extremely difficult to avoid and in can be particularly difficult to recover from without advance planning and the right technology. Such errors c
The Keys to the Database
(Robert Catterall) Choices related to primary key selection are among the more important decisions made in developing a database design to support an application. In this column, I would like to share with you some of my thoughts about primary key selection for a DB2 database.
Bind variables – The key to application performance
If you’ve been developing applications on Oracle for a while, you’ve no doubt come across the concept of «Bind Variables». Bind variables are one of those Oracle concepts that experts frequently cite as being key to application performance, but it’s often not all that easy to pin down exactly what t
Implementing the Physical Database
(Thomas Moore and Ed Tittel) This chapter deals with the physical components of a SQL Server database system. Beginning with the server hardware, organizing the data storage and creating the physical files is where a lot of future performance will be determined. There are many options to conside
Understanding UDDI’s tModel
(liyang yu) Recently I have been working on semantic Web and semantic Web services, this effort requires some fairly detailed understanding of UDDI data structures and APIs, especially its tModel concept. Reading some official documents about tModel’s specification only made me even more confused: w
Work with Web services in enterprise-wide SOAs, Part 8: Notify Web services and EAIs in heterogeneous SOAs
(Judith Myerson) In Part 7 of this series, I showed why the XML-binary Optimized Packaging specification (XOP) package is more effective than XML parsers in processing large, bloated Web services in text format. I also showed how to convert them into a more streamlined, binary format in multiple Ser
Workload Manager Implementation and Exploitation
(Paola Bari) This IBM Redbook gives a broad understanding of the Workload Manager component of the z/OS system. It covers basic aspects of Workload Manager (WLM) together with the new functions available in the z/OS release up to z/OS 1.7. The book provides a discussion on how to create WLM policies
Processing XML with Xerces and SAX
(Ethan McCallum) In my previous article, I introduced the Xerces-C++ XML toolkit and explained how to use Xerces for DOM parsing. This time, I’ll explain Xerces SAX parsing, plus error handling and validation.
SQL Server 2005 – SQL Server Integration Services – Part 12 – Logging
(Marcin Policht) In one of our earlier articles dedicated to the WMI Event Watcher Task of the SQL Server 2005 Integration Services, we briefly mentioned SSIS logging functionality (which needs to be enabled in order to configure the ActionatEvent configuration WMI option). This allows us to verify