問題文
An application must read rows that live in another Oracle database. The developer compares a REST Enabled SQL reference with a database link. Which statement describes a difference between them?
選択肢
- A database link returns a response that describes its own columns and their data types while a REST Enabled SQL reference needs columns described by hand.
- A REST Enabled SQL reference reads the rows over the network every time while a database link copies the remote rows into a local table on a schedule that the developer defines.
- A database link works at the SQL level so a query can mix remote and local tables while a REST Enabled SQL reference cannot be joined to a local table.
- A REST Enabled SQL reference is defined inside one application and stays private to it while a database link is stored at the workspace level and is visible to every application there.