The Oracle BDB release notes have no meat at all, unfortunately.
Why would I want to switch from BDB JE version 5 to version 6? Does it have significant performance improvements? Because if not, I can only see these two cons:
- v5 uses Sleepycat, v6 uses AGPL 3. Thus v5 is compatible with GPL v2+, whereas v6 requires me to go to GPL v3
- v5 works with Java 6, v6 requires Java 7
