There usually a philosophic battle happening when it comes to underscore parameters. The official statement is more or less: It’s an underscore, hence it is undocumented and you shouldn’t touch it unless Oracle Support advises you to do so. I agree in many cases. But in this specific one, I don’t. And in this post I will explain why you should set
_EXCLUDE_SEED_CDB_VIEW=FALSE in all your singe- and Multitenant environments. Always!
A bit of history
At first, a little bit of a history excursion. This parameter wasn’t an underscore in Oracle 12.1. You can find it as
EXCLUDE_SEED_CDB_VIEW in 220.127.116.11 …