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Scrum – additional resources

November 28th, 2011 No comments

The basics of Scrum can be found in the Scrum Guide. Besides that there are loads of resources available on the subject. In this post I’ll share a few with you I recently discussed with my colleagues:

Besides these the online library of one of my colleagues gives some other great hints. You might also like to read his selection of 10 from ‘Corps Business: The 30 Management Principles of the U.S. Marines’.

Dis-economies of centralization

October 27th, 2011 No comments

While in a previous post I was arguing that we should handle industry models with care, because of very inconvenient side effects. This week I’ll blog in a similar way on centralization. Among the effects of centralization are often overlooked or neglected dis-economies of scale.

Dis-economies of scale

One of the main reasons for centralization is to gain economies of scale. Less known are the dis-economies of scale. I’ll give some examples in the paragraphs below.

The cost of communication between the central group and the rest of the organization. Although there are lots of tools that make communication easier. Distance in the physical sense or within an organization can create boundaries. These have to be dealt with and there are costs incurred for that. Besides that it has to be clear who to communicate for what matters. This, in my experience, is not always the case. With a greater (organizational) distance more effort has to be put into this.

There is a large possibility that top heavy management in a centralized department becomes isolated from the effects of their decisions. In other words the feedback loop is broken. Because the communication loop is broken, decision become more and more dysfunctional. This due to the lack of real world knowledge that should be incorporated in these decisions.

Centralization can lead to reduced agility. On one hand standardization is a great asset. The larger part of architecture, whether it is enterprise architecture, process architecture or infrastructure architecture, is about standards and reducing the “solution space”. This has several advantages, among which the reduction of software- and systems entropy. The downside of a centralized body that maintains standards is that it probably will lead to inertia and unwillingness to change.

I’m a big fan of (open) standards. They simplify life! However we should not neglect that standardization comes at a cost. There are the costs for implementing, adapting to and maintaining standards in our organization. Say for example that we use a canonical (data) model. There is are maintenance costs (at least some effort) while adopting to change outside and within our organization. These costs of standardization tend to be hidden.

What to do?

Bring the effects described before into the business case for centralization. You did make sure that there was some sort of trade off when you decided to centralize a certain part of your organization didn’t you?

Take measures to prevent these risks. It goes without saying that these measures will take effort, time and possibly money. Now you know you’re going to take measures don’t you?

Oracle BPM Suite 11g Handbook and free resources

October 27th, 2011 No comments

BPM Suite 11gRecently McGraw Hill published the Oracle Business Process Management Suite 11g Handbook. It is available on their site and at Amazon.com.

Here is the table of contents with the links to the free chapters:

    Part I: Introduction

  1. BPM – Background
  2. Standards in BPM
  3. BPM Suite 11g – Overview
  4. Part II: Mastering Oracle BPM 11g

  5. Quick Learners Guide to Oracle BPM 11g
  6. Business Process Modeling and Implementation using BPMN 2.0
  7. Mastering Business Rules
  8. Advanced Human Tasks
  9. Developing Rich User Interfaces for BPM with ADF
  10. Part III: Essentials of Oracle BPM Methodology

  11. Planning a BPM Adoption
  12. Strategic Analysis, Process Selection and Design
  13. Technical Design and Project Delivery Strategies

Industry Data Models, Processes and Architectures

October 13th, 2011 No comments

Recently while listening to OTN ArchBeat podcasts, a panel discussion on Reference Architectures (part 2 and part 3) I was thinking back to some pieces I wrote on industry data models and processes that I didn’t share with you yet. There a some similar argument to using these and reference architectures.

The value of reference models whether it contains data models, standardized messages, processes of a reference architecture, is or should be in a faster time to market and better quality of the solution.

Handle with care

What makes it hard to achieve this value, is the fact that these models contain always far more than is needed. That can be considered a waste. Even the parts that are not used still require attention while implementing and maintaining. This incurs work to understand the complex model, hide the details you don’t need, and customize and extend the parts you need.

Implementing a reference model requires spending time to determine how and to what extend this model meets the needs of your business? That is typically something you have to discover for yourself. It is where the majority of the time is spend! If you don’t go through the effort of understanding your business requirements, you are missing understanding of how the business can and should use the model. That makes it very hard to determine the value of the end solution to the business.

When using a reference models you should be aware that your business is not average. In some shape or form it delivers value to your customers in away a reference model doesn’t provide. Reference models should be used with care your business deserves.

Whitehorses publishes Oracle Forms Survey results

October 6th, 2011 No comments

WhitehorsesWhitehorses published the results of their Oracle Forms Survey on their blog. I’ll share three remarkable results. Please read the whole post on their blog:

  • Over 30% is still running Client – Server (Forms 4.5 or 6i).
  • Over 50% doesn’t consider upgrading their unsupported version.
  • When replacing Oracle Forms APEX is the most considered alternative.

The results are mostly in line with the findings in Germany (on which the survey was based).

Categories: Oracle, Tools
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Installing Oracle Enterprise Repository

September 22nd, 2011 No comments

This blog post will show you how to install Oracle Enterprise Repository, or OER in short. The assumptions is that you have a running WebLogic Server (with SOA Suite on top of it) and a database.

Prepare – database

The most important part of the preparation for the installation of Oracle Enterprise Repository is the creation of tablespaces and the user that will hold the database objects.
Create the required tablespaces
You can change the names of the tablespaces and alter the path and names of the data files according to your needs. The example is based on an installation on the Windows OS. If your on Linux/Unix you probably know what to do to make it work on your platform…

CREATE TABLESPACE OER_DATA
    DATAFILE 'D:\oracle\oraclexe\oradata\XE\oer_data.dbf' SIZE 300M
 AUTOEXTEND ON NEXT 10240K MAXSIZE UNLIMITED
    EXTENT MANAGEMENT LOCAL AUTOALLOCATE
    LOGGING
    ONLINE
    SEGMENT SPACE MANAGEMENT AUTO;
 
CREATE TABLESPACE OER_LOB
    DATAFILE 'D:\oracle\oraclexe\oradata\XE\oer_lob.dbf' SIZE 300M
 AUTOEXTEND ON NEXT 10240K MAXSIZE UNLIMITED
    EXTENT MANAGEMENT LOCAL AUTOALLOCATE
    LOGGING
    ONLINE
    SEGMENT SPACE MANAGEMENT AUTO;
 
CREATE TABLESPACE OER_INDEX
    DATAFILE 'D:\oracle\oraclexe\oradata\XE\oer_index.dbf' SIZE 300M
 AUTOEXTEND ON NEXT 5120K MAXSIZE UNLIMITED
    EXTENT MANAGEMENT LOCAL AUTOALLOCATE
    LOGGING
    ONLINE
    SEGMENT SPACE MANAGEMENT AUTO;

Create the user
Change the user name and password (both OER in this case) to cater your needs.

CREATE USER OER IDENTIFIED BY OER
DEFAULT TABLESPACE OER_DATA
    TEMPORARY TABLESPACE TEMP;
 
GRANT CREATE MATERIALIZED VIEW TO OER;
GRANT CREATE SEQUENCE TO OER;
GRANT CREATE SESSION TO OER;
GRANT CREATE SYNONYM TO OER;
GRANT CREATE TABLE TO OER;
GRANT CREATE TRIGGER TO OER;
GRANT CREATE VIEW TO OER;
GRANT UNLIMITED TABLESPACE TO OER;

Install OER

Us the follwing command from a dos prompt to start the OER installation. By default it will start in graphical mode. You can use the -mode option to start it in console or silent mode.

java -jar OER111150_generic.jar -log=C:\installSOA\logs\OER_install.log

Run WebLogic Server Domain Configuration Wizard

To run the Domain Configuration Wizard on Windows you can click: Start > Programs > Oracle Products > Tools > Configuration Wizard. On any platform you can run the config script in the /common/bin/config.cmd. For example:

> cd oracle\Middleware\wlserver_10.3\common\bin
> config.cmd

Post Install actions

To use all options in the Repository you need to install Java Web Start. To check whether Java Web Start is installed correctly use the test Java link.

In case the JNLP stuff (needed for java Web Start) doesn’t work. This Firefox JNLP fix might help you (via Andreas).

Virtual PC (0×80004005) doesn’t tolerate VMWare or VirtualBox

August 22nd, 2011 No comments

Since I had to test some webpages with IE6 (please don’t ask), I wanted to use Windows XP Mode on my Windows 7 laptop (actually run it in VMWare as described here). Microsoft provides virtual machines (vhd files) to run in Microsoft Virtual PC.

KB958559 fails with 0x80004005

Rolling back the update

Windows Virtual PC for Windows 7 is released as an update for Windows 7, and has the Knowledge Base Article ID of KB958559. So I tried to install it. That went actually pretty well until I had to reboot my laptop. At about 98% of the update process during the reboot it gave an error and rolled back the update. The log showed:

Installation failure: Windows failed to install the following update with error 0×80004005: Update for Windows KB958559

Digging into the support forums and blog posts on the subject, the most common working solution I found to the problem was to uninstall VMWare and/or VirtualBox. After the uninstall you can install Virtual PC without the error and after that reinstall VMWare and/or VirtualBox.

SOA Suite Installation Quick Start

July 14th, 2011 No comments

There are always quite some blog posts on installing SOA Suite on several platforms. Recently I discovered that Oracle publishes a Quick Start Guide on the SOA Suite (PDF!) that mainly deals with the installation process (and de-installation should you need it).

This guide is aimed at installations for developers and not for production machines. Unfortunately the installation of OSB is out of scope. I expect it to be upgraded to PS4 (11.1.1.5) soon. I could find any missing instructions while installing PS4 on a Windows7 VirtualBox.

This document looks very similar to the installation chapter in Getting Started with Oracle SOA Suite 11g R1.

Update

It was confirmed by Simone Geib, Product Manager in the Oracle SOA team, that both the OSB part and the PS4 update are coming soon.

Update September

The update for SOA Suite PS4 (11.1.1.5) including Oracle Service Bus is now available.

Lady Java promoting JavaZone 2010

August 26th, 2010 No comments

A tweet by meneer pointed me to this promotional video:

Don’t think this will settle the score for Java. However it is a good distraction… What are your thoughts? Please leave them in the comments.

Categories: Release, Tools
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