4.Which four are true about creating and running a remote database scheduler jobs?
A) A credential is optional for a remote database job.
B) A database destination group must exist or be created for a job to run on multiple remote databases.
C) A destination is optional for a remote database job because DB links can be used instead.
D) It must run as a user that is defined on the remote database.
E) A credential must be created to define the remote user.
F) Remote database jobs always run as the same user who submits the Job on the local database.
G) A database destination must exist or be created for the remote database.
Answer：BDEG
(解析：Database Destination (數據庫路徑),通過 CREATE_DATABASE_DESTINATION 創建，在 CREATE_JOB 中作爲一個輸入參數，用來執行遠程調度。redential (證書),證書用來保存 OS 或者數據庫的用戶密碼，在執行 External Job 或者遠程數據庫作業時使用。ocp討論3組：1015267481 驗證ocp)