We are running V15.1 (active upgrade) in development. We carried forward our startup options from V14. The break options was set at 25 based on the DB system and Admin Guide - 'We therefore do not recommend using low numbers, such as 2 to 5. Picking a number in the range 15 to 25 is reasonable.'.
The Best Practices message is
DB01922W - BEST PRACTICE SUGGESTION - 1) BREAK LT 50, TARGET 100-200
The values suggested do not correspond to the paragraph in the Admin Guide. I will have to assume the best practices are correct, but the best practices suggestion 4 to 8 times higher than the Admin guide suggestion. I would request the Admin guide be updated to correspond to best practices suggested amounts to avoid confusion.