A. A non-deferrable PRIMARY KEYor UNIQUE KEYconstraint in a table automatically attempts to creates a unique index.
B. Indexes should be created on columns that are frequently referenced as part of any expression.
C. When a table is dropped, the corresponding indexes are automatically dropped.
D. For each DML operation performed, the corresponding indexes are automatically updated.
Correct Answer: ACD
Section: (none)
Explanation：解析，有点数据库管理的意思
【OCP-12c】2019年CUUG OCP 071考试题库（75题）
原文：https://blog.51cto.com/13854012/2361161