电力系统是指电力网以及向其提供（）和获取（）的一切电气设备。
用人单位与工伤职工终止或者解除劳动合同时，应当享受的一次性医疗补助金和应当享受的一次性伤残就业补助金，按照国家规定由用人单位支付。
Identify two situations in which you can use Data Recovery Advisor for recovery. （）(Choose two.) The user has dropped an important table that needs to be recovered.。 The database files are corrupted when the database is open.。 You are not able to start up the database instance because the required database files are missing.。 The archived log files are missing for which backup is not available.。
You are working in an online transaction processing （OLTP） environment. You used the FLASHBACK TABLE command to flash back the CUSTOMERS table. Before executing the FLASHBACK TABLE command， the System Change Number （SCN） was 663571. After flashing back the CUSTOMERS table，you realize that the table is not in the correct state and the resultant changes are not what you had desired. So， you need to reverse the effects of the FLASHBACK TABLE command while ensuring that： a） No other user data in the database is affected. b） The operation takes the minimum possible time. Which option would you choose？（） use the ROLLBACK command with SCN 663571。 perform Flashback Transaction Query with SCN 663571。 execute the FLASHBACK DATABASE statement to retrieve the CUSTOMERS table as it was at SCN 663571。 execute another FLASHBACK TABLE statement to retrieve the CUSTOMERS table as it was at SCN 663571。
You want to create a role to meet these requirements： 1. The role is to be protected from unauthorized usage. 2. The password of the role is not to be embedded in the application source code or stored in a table. method would you use to restrict enabling of such roles（） Create the role with external authentication.。 Create the role as a secure application role.。 Create the role as a password-protected role.。 Create a role and use Fine-Grained Access Control （FGAC） to secure the role。
You work as a database administrator for Supportcenter.cn. While granting a role， SELECT_CATALOG_ROLE， to a user， SupportCenter， using Oracle Enterprise Manager 10g Database Control， you have cleared the DEFAULT check box. What will be the result？（）
