“实际上”足够的数据库规范化水平是多少？

Question

I am designing a database and I reached (as per my little knowledge) the Third Normal Form (3NF)

Some of my colleagues told me about a Sixth Normal Form .! I was wondering how to know if the level of normalization of database is enough.

Answer 1

In my experience, it's pretty rare to hear anyone talk about going beyond 3NF for real-world production applications. That should be sufficient for nearly all cases.

Answer 2

Normally 3NF good enough, but it really depends on your requirements. Be practical in your design.

Answer 3

I usually optimize my DBs up to 3 NF. Usually, it is enough.

Answer 4

Practically - it depends on your needs. For small and quick applications, you are happy with 1NF.. even 0NF, since you don't care.

As much as application grows, you need datastructure optimizations.

If you are trying to-do some upfront desing keep 3NF as major.

Answer 5

Aim to be in 5NF unless you find good reasons to deviate from that. 6NF should only be applied in special cases because in most cases in most DBMSs you won't be able to implement all important dependencies under 6NF.