Issues With Data Migration From Oracle To Postgres
When it comes to migrating databases, Oracle to Postgres is one of the most common types that individuals and businesses look for. This can be a very hard and expensive task if not done properly or if you don't have the right person for the job. It can sometimes be hard to find a company who will provide this service because of how hard it can be to finish. There are three major issues that impact the ease or difficulty in completing this job.
The first obstacle that people will come to is that the PL/SQL source code in Oracle does not translate well to the PL/pgSQL source code in Postgres. This conversion requires that the code be completely rewritten which is very time consuming and can be expensive. Additionally, the changes will need to be tested and retested several times to make sure that the translation was correct and will be functional with the PL/pgSQL source code.
The second issue that may come up is that the Oracle to Postgres translation will not always be functional. Even with similar syntax, the two source codes are known to work in completely different ways. This issue can make the translation hard since a direct translation is not always possible for the program to behave correctly. In order to have a functional outcome, the programmer will need to be skilled and fluent in both kinds of coding.
An additional issue that is often seen in this process is that client code interfaces are often affected. As stated before, the two source codes are incompatible which means that a direct translation is not possible. The Oracle to Postgres conversion is also nearly impossible to complete without at least a small amount of information misplaced.
Tools are offered to help make the process of Oracle to Postgres migration easier by allowing for a large scale conversion and testing/retesting in a shorter span of time. Generic migration tools are available directly from Oracle, but it is often best to have a tool designed specifically for the system to minimize the loss of data.
Because of all of the issues that may come up during the database migration, it is greatly recommended that a specialist is called upon to complete the process. This will help to keep the problems to a minimum as well as help to prevent lost information. Professionals will design a data migration tool that is specific to your system and will both take care of the conversion as well as the testing for functionality. If the migration is completed satisfactorily, then you will not notice a huge difference in the functionality and no major errors will occur.
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