Some Thoughts about Big Data
“Big Data” gets more and more attention in general and very specific in software development. But, there are some misunderstandings and also some misinterpretations. The first point of […]
More DetailsFrom Virtualization to Big Data: A Change of Paradigm
I had some discussions lately with people about Virtualization and Big Data in regard to I/O performance. After years of work to bring servers into a virtual environment […]
More DetailsLocal Indices on Partitioned Tables
I wrote an article lately about a simple model to understand indices in databases. It may help to read the other article first. In a data processing […]
More DetailsSimple Model for Understanding Database Indices
I had a lot of discussions in the past about databases and indices. The type of the database is not important, as the general design of indices are […]
More DetailsJava: Performance issues with FileInputStream
During the studies of database design with the accompanying toy project DuctileDB, I found some disturbing performance issues. During the implementation of a needed log structured storage, […]
More DetailsThoughts on the Different Kinds of Test
General Remarks Testing shall assure the quality of a product and that development does not break the already implemented functionality. The quality is defined in ISO 9126 for […]
More DetailsHow to handle objects with a life cycle
In C++ and other programming languages, constructors are paired with destructors. These help to close file handles, database connections and the like in case the object is destroyed. […]
More DetailseXtended Objects: ORM for No-SQL Databases in JavaEE
Since the appearance of object relational mappers (ORM) the programming of persistence layers became easier and less error prone. ORMs store objects in SQL databases by interpreting the […]
More DetailsImplementation of a complex Java Iterator
In a lot of situations it is better to handle data as streams to keep the memory profile low and to decrease latency. To access data in such […]
More DetailsTest Approches for Green and Brown Field Projects
The picture on the right side show the relationships between the different test levels. The tests are a kind of test stages in green field projects. Usually, the […]
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