1Z0-052多項選擇題每日一練(2019.05.09)

You are working on a database that must be functioning 24 hours a day， 7 days a week. The databaseis configured in ARCHIVELOG mode. 
Which two options do you have for performing user-managed backups（）

You configured the Flash Recovery Area （FRA） for your database. The database instance is runningin ARCHIVELOG mode. The default location for the archived redo log files is the Flash Recovery Area. 
Which two files are removed automaticallyif the space is required in the FRA as per the retention policy（）

A constraint in a table is defined with the INITIALLY IMMEDIATE clause. You executed the ALTER TABLEcommand with the ENABLE VALIDATE option to enable the constraint that was disabled. 
What are the twoeffects of this command（）

Examine the command：
SQL> ALTER USER skd ACCOUNT LOCK；
Which two statements are true after the command is executed（）