openDBcopy is an open-source project by Anthony Smith, published under the terms of the GNU General Public License, see GPL License.
openDBcopy core component can be seen as an application framework providing everything required to run a plugin. Configure a database migration project using the openDBcopy graphical user interface.
I would like to specially thank Mr Blatter (Swiss Department for Defence, Civil Protection, Sports) for allowing me to publish openDBcopy as open-source software @sourceforge.
Thanks to all taking the time to test, use and improve openDBcopy.
If there is not a need, you normally do not find any software for it.
In summer 2003 I was asked to plan and migrate the database of the Swiss Sports Management System (National Database for Youth and Sports). The source database was IBM's DB2, running on a host, OS390. The destination platform was AIX5.2, Oracle 9i.
A database migration is normally required when systems are going to be changed. The former system was running completely on the host, using DB2 and Websphere 3. The new system is built up using Webserver and Application Server Clusters, all running on Linux. The database itself on AIX5.2.
I hope you can see what I want to show you. A database migration is normally not just copying tables. This includes changes of the application ... and therewith changes of the database schemas.
So I began looking for a database migration utility which was able to fulfill my special requirements. It became obvious that I either have to develop a lot of PL/SQL transformation scripts or develop a new utility - openDBcopy.
I first tried to use Oracle's Migration Workbench, which, at first glance, looks brilliant. But, but, but ... soon I got an answer from their staff that this migration workbench does not support DB2 on OS390. I tried out several other ways ... such as migrating into MS SQL first and then into Oracle ... and a lot of other nightmare scenarios. However, none of these ways solved my migration requirements elegantly enough.
Even if you have a migration tool that can copy data from DB2 to Oracle, you still need to modify your data according to the new requirements.
So the idea of openDBcopy began on a Saturday afternoon, when I was waiting for a tram... and 17 hours later I had my first implementation of openDBcopy. No GUI, just running from a shell.
Two weeks later a front end and further features were implemented, so that I was a able to make a first successful database migration.
At the end of 2003 we made the final migration. I was quite happy that I had developed openDBcopy to avoid too much repeated work. Think about how much manpower you need if you choose the conventional way ... extracting data into files, convert the files, write loading and transformation scripts.
Since then I have used openDBcopy on several other projects. Some of them were again DB2 to Oracle. Others were MySQL to PostgreSQL, MySQL to MySQL, MS Access to MS Access (using jdbc:odbc bridge).
openDBcopy comes with a handful of plugins which can be configured with a comfortable graphical user interface.
Special requirements can easily be developed. See the developer manual for more details.
By conventional way I understand dumping data from the old database, transfer, convert and prepare the data for the new database and last but not least, load the new data into the new database. Taking our projects as a reference this would have involved three people to do that job.
An "open" tin is a silent protest against these commercial database symbols looking like "closed" oil barrels ;-)