Hotsos Symposium Speaker – Gerwin Hendriksen

Mr. Hendriksen is a prior Hotsos Symposium presenter.


Gerwin HendriksenGerwin Hendriksen has been working with Oracle technologies for more than ten years. He started work as a DBA at a consulting company in the Netherlands. After this, he worked for five years for Oracle in the role of Advanced Resolution Engineer. In this role, he has specialized in performance and high availability for the Oracle database and Oracle E-Business Suite. In his time at Oracle, he gave several training classes in different countries.

Later Mr. Hendriksen joined IBM, and worked there for two years. At IBM, he worked as a Technical Consultant for several projects in different countries. He also gave training classes in the IBM JSC in Montpellier, and at several customer sites. Currently, he is working for AMIS Services BV in the Netherlands, where he is working as a Technical Architect. At Amis, he has given several presentations about Oracle database performance and Oracle E-Business Suite performance. He has also given a presentation for the Oracle User Group Holland (March, 2007), at Hotsos Symposium 2008, at the DBA Symposium in Holland (Planboard) and at Oracle Open World 2008. During these last mentioned presentations, he presented on his newly developed performance method, called "GAPP".

Presentation Title

Practical Use of Method GAPP to Find Performance Bottlenecks for Business Processes in Complex Architectures


The presentation will demonstrate how business processes response times, from front-end to back-end, which can be profiled by usage of the performance method, called "General Approach Performance Profiling" (GAPP) that was introduced at Hotsos Symposium 2008. This method uses data mining and can be used easily in practice. In this presentation, actual customer data will be used, and a live demo will be given on how to use this new method easily and successfully. It is important for the attendees to know that GAPP is a method and not a tool.

The power of the performance method GAPP is in the fact that it not only looks at the database, but does a full analysis of the whole technical infrastructure, independent of the technology used. This method can use any data available, and it is a very "general approach". In the presentation, complex infrastructures with more than three nodes involved and SOA architectures will be analyzed. Business processes are influenced by many components like web, portal, Oracle internet directory, database, and application servers. This method will pinpoint where the biggest wait time is in such architectures and will even be able to predict where your biggest performance bottleneck will occur.

GAPP consists of four important steps:

  • Data Collection
  • Data Synchronization
  • Data Mining
  • Data Interpretation

During the presentation, these steps will be made clear. The data used for GAPP can come from ASH, system metrics, Moniforce, Load Runner, J-Meter, statspack, SOA Suite Dehydration Store, etc. This method is very useful in situations where performance bottlenecks are only found in production and tracing is not allowed. Currently, architectures are getting more and more complex, which will make these situations more common, and so GAPP is the right method to be used. SOA architectures will highly benefit from GAPP.

Presentation Materials

Mr. Hendriksen's presentation materials will be made available just before his presentation slot on Monday afternoon. We apologize for the delay, but we asked Gerwin to present after a last-minute cancellation. Please keep in mind that presentation materials are available online to attendees only.


The speaker schedules can be found at the following links: