Last Updated February 28, 2009.
Managing Time in Relational Databases.
Forthcoming from Morgan-Kaufmann, Spring, 2010.
by Tom Johnston and Randy Weis.
About the BookAsserted Versioning: Fully Encapsulated Real-Time Access to Past, Present and Future Bi-Temporal Data.
A presentation I made, in June, 2008, to the New York ERwin Modeling User's Group. This is based on material from the Time and Time Again series.
The Time and Time Again Series.
A series of articles being published in DM Direct, the on-line newsletter of Information Management (formerly DM Review). Articles archived under "Johnston" at Information-Management.com.
The Asserted Versioning Glossary. (Updated February 28, 2009.)
The glossary, controlled vocabulary and ontology for that series.
Semantics and Ontology in IT Data Management.
A presentation I made at the Semantic Technology 2007 Conference.
Speaker notes for that presentation.Primary, Surrogate and Business Keys: the Semantics and Syntax of Codd's Information Principle.
A presentation I made at the DAMA International 2008 Conference, in San Diego CA.
Speaker Notes for that Presentation.What Is Semantics?
Semantics is what is expressed in taxonomies and ontologies -- and also in database schemas, program code and SQL statements. A brief introduction, for the IT professional, to a concept which is used far more than it is understood.
Reflections on Enterprise Architecture.
Last updated July 16, 2008.
Over three decades in business IT. Early years in mainframe COBOL and assembler, using BDAM and VSAM access methods, also working in MVS and CICS internals. Later years in OLTP, warehouse and dimensional data modeling, enterprise data models, enterprise data architectures, and recently, taxonomies and ontologies.
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Seminars: I offer one-day seminars, to be held at your site, on the following topics:
Terms: travel expenses plus an honorarium. |
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