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[多选] Which three statements are true about using flashback database in a multitenant container database(CDB)?()

A . The root container can be flashed back without flashing back the pluggable databases (PDBs).
B . To enable flashback database, the CDB must be mounted.
C . Individual PDBs can be flashed back without flashing back the entire cdb.
D . The DB_FLASHBACK RETENTION_TARGET parameter must be set to enable flashback of the cdb.
E . A CDB can be flashed back specifying the desired target point in time or an SCN, but not a restore point.

While setting up the database for your production environment, you want to create a user with following requirements.  1.The objects created by the user must be stored in a tablespace, TBS1, if the TABLESPACE option is not defined during the object creation.  2.The user should be able to use 10MB of space in the tablespace TBS1.  3.The user must change the password immediately after logging in for the first time. Which three options of the CREATE USER command would you use to achieve this objective?() profile。 account lock。 account unlock。 password expire。 quota 10MB on TBS1。 password never expire。 default tablespace TBS1。 quota unlimited on TBS1。 temporary tablespace TEMP。 temporary tablespace SYSTEM。 工伤职工的住院伙食补助费不属于工伤保险基金支出范围。 You are developing a Hotel Booking application for a travel company. The users request a wizard-style interface for this application. How could you satisfy this requirement?() Reference the Object Iron packages in your form module. 。 Write an HTML interface, and invoke it from your form module. 。 Include the Wizard class reusable component in your application. 。 Build a customized wizard using tab canvases and a horizontal toolbar canvas.。 平衡训练的基本原则有()、()、()、()、()、()和破坏前庭器官的平衡来保持身体的平衡。 “七月派”诗人()、牛汉、绿原等,在文革专制统治期间,依然写下了对人生和生命的个人感悟。 Which three statements are true about using flashback database in a multitenant container database(CDB)?()
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