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  • OCP-1Z0-053-200题-21题-602

    QUESTION 21

    On Friday at 11:30 am you decided to flash back thedatabase because of a user error that occurred at 8:30 am.

    Which option must you use to check whether a flashback operation can recover the database to the specified time?

    A. Check the alert log file

    B. Query the V$FLASHBACK_DATABASE_LOG view

    C. Query the V$RECOVERY_FILE_DEST_SIZE view

    D. Query the V$FLASHBACK_DATABASE_STAT view

    E. Check the value assigned for the UNDO_RETENTION parameter

    Answer: B

    同602题:http://blog.csdn.net/rlhua/article/details/12423809


    Explanation/Reference:

    Section: Flashback Operations & Configuration

    select oldest_flashback_scn, oldest_flashback_time from v$flashback_database_log;

    SYBEX Oracle 1Z0-053 Study Guide, Chapter 9: Understanding Flashback Technology

    Query the V$FLASHBACK_DATABASE_LOGto determine the amount of space required in the recovery area to support the flashback activity generated by changesin the database.

    The values in the OLDEST_FLASHBACK_SCNand OLDEST_FLASHBACK_TIME columns give you information regarding how far back you can use Flashback Database.

    Oracle Press 1Z0-053 Exam Guide, Chapter 9: Configuring and Using Flashback

    You can determine how far back you can flashback the database by querying the V$FLASHBACK_DATABASE_LOG view. The amount of flashback data retained in the database is controlled by the initialization parameter and the size of the flash recovery area.

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  • 原文地址:https://www.cnblogs.com/hzcya1995/p/13316159.html
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