IDM 7.1 does not support MySQL repository database?

Question

In the IDM 7.1 release notes it states a note under the requirements
Identity Manager supports the following repository database servers...
NOTE Identity Manager supports MySQL in a development environment only.
MySQL is not supported in a production environment.
Can someone comment on this. This is new.

Answer 1

Note that the support for MySQL also extends to the SPE functionality; you can run a MySQL script to allow you to build a development instance without having to have an Oracle instance, thus saving money in the dev environment. However, in production, installations relying on the SPE transactional functionality in IdM would almost always use Oracle over MySQL. So far, no SPE customer we know of is running MySQL in production, thus the stance of development only, not production.
As for the IN versus JOIN; JOIN works as construct if the sought after value appears in more than one column/table within the database (Orders.EmployeeID = Employee.EmpID). As IdM has a datasparse design and tends to do more lookups from the user interface, there is a need to rely on IN to try and find the desired records. IN is a perfectly legal basic SQL command that is supported across all databases (thus not a bug). To fork the code to handle MySQL differently (if the lookup is feasible with a join) would defeat the purpose of using standard SQL to access the repository.