I recently did some 'lock-in' consulting with a company who had heavily committed to an open source database. The database had two versions, community and enter

I recently did some 'lock-in' consulting with a company who had heavily committed to an open source database. The database had two versions, community and enterprise, previously both were open source with the enterprise version optionally being supported by a service contract. The company then changed the license of the enterprise version to a closed source pay only subscription model with a HUGE yearly license fee. The tech team are now eating major crow from the business side of the company. I ultimately recommended that they rewrite the data access layer to use PostgreSQL. Which they are doing, in the end it will result in a more modular and extensible application architecture. Lock-In is something that should be avoided.