You might have seen the recent news reports about the collision between U.S. and Russian communication satellites. The U.S. satellite was one of the Iridium satellites. What wasn’t reported and you probably don’t know is that an object database management system (ODBMS) is an important part of the Iridium system. Even though ODBMSs are a [...]
February 13, 2009
I am now also posting on the Cutter Blog. My initial posting is (The Acronym) SOA is (Perhaps) Dead (at Some Companies); Long Live Services. It is a response to Anne Thomas Manes’ SOA is Dead; Long Live Services on her blog at the Burton Group.
January 9, 2009
The typical definition of an atomic task or process is one that cannot be decomposed further. This is vague and subject to interpretation. The Decomposition Matrix on this site uses a specific definition: A task (for business process diagrams) or a process (for data flow diagrams) is atomic if every input relates to every output [...]
December 3, 2008
My last posting referenced the criteria for a well-formed business process diagram mentioned in Business Process Driven SOA using BPMN and BPEL by Matjaz B. Juric and Kapil Pant. I am going to expand on their criteria to create a more comprehensive definition of a well-formed business process diagram. To start, here are three criteria [...]
November 18, 2008
I recently received two new books on business process modeling. Both books looked interesting because they had great titles. As it turns out, one book is great and the other not so good. The not so good book is Business Process Driven SOA using BPMN and BPEL by Matjaz B. Juric and Kapil Pant. There [...]
October 9, 2008
The Design Decomposition Blog is written by Doug Barry.
The myth that ODBMSs are slow has no basis in reality. ODBMSs have always
excelled at high performance on complex data. It is not unusual to see private
benchmarks that show ODBMSs running anywhere from 10 to 1000 times faster than
an RDBMS when accessing complex data. See complex
data (new window).
I have been able to think of two possible sources of this myth:
Some people who have a strong background in relational modeling often, at
first, have trouble designing an object model. It is sometimes quite hard to
not use intersection entities and type codes that are used so often in
relational models but can nearly be eliminated in object models. So, a
poorly design object model has the potential of making an ODBMS run slowly.
Some people believe ODBC stands for Object Database Connectivity. (I have
seen press releases that use ODBC this way!) Well, ODBC stands for Open
Database Connectivity and it does have a reputation for being slow. So, if
you think ODBC refers to object databases, you could understandably have the
wrong idea that ODBMSs are slow.
Don't just take my word for it, listen to what Dr.
Michael Stonebraker said about object database performance at the
Object/Relational Summit in August 1997. At the time, Dr. Stonebraker was the
Chief Technology Officer at Informix Corporation. In this audio clip he mentions
ODBMS performance with C++. Java had not as yet come on the scene. Audio clip: Stonebraker.mp3.
There are nearly 400 pages of articles on this site with over 50 pages on object-oriented database management systems.
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