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  • [bbk4485]第二章Flashback Database 04

    Monitoring Flashback Database

    To monitor the ability to meet your retention target:

    • View the Fast Recovery Area disk quota:
    SQL> select estimated_flashback_size,flashback_size FROM V$FLASHBACK_DATABASE_LOG;
    
    ESTIMATED_FLASHBACK_SIZE FLASHBACK_SIZE
    ------------------------ --------------
                   236912640       63766528

    根据实际运行情况,估算磁盘配额比例

    • Determine the current flashback window
    SQL> SELECT oldest_flashback_scn,oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG;
    
    OLDEST_FLASHBACK_SCN OLDEST_FLASHBACK_T
    -------------------- ------------------
                 4284553 15-MAY-13

    最早能闪回到哪个点?时间点、SCN;

    • Monitor logging in the Flashback Database logs:
    SQL> SELECT * FROM V$FLASHBACK_DATABASE_STAT;
    
    BEGIN_TIME         END_TIME           FLASHBACK_DATA    DB_DATA  REDO_DATA ESTIMATED_FLASHBACK_SIZE
    ------------------ ------------------ -------------- ---------- ---------- ------------------------
    15-MAY-13          15-MAY-13                32456704   39747584   31642112                        0
    15-MAY-13          15-MAY-13                 3506176    4407296    1249792                101498880
    15-MAY-13          15-MAY-13                 3481600    4399104    1229824                106487808
    15-MAY-13          15-MAY-13                 8298496   11722752    2757632                115752960

    V$FLASH_RECOVERY_AREA_USAGE

    You can query V$FLASH_RECOVERY_AREA_USAGE to view the flash recovery area disk space usage.

    SQL> SELECT file_type,percent_space_used AS used,percent_space_reclaimable AS reclaimable,number_of_files AS "number" FROM V$FLASH_RECOVERY_AREA_USAGE;
    
    FILE_TYPE                  USED RECLAIMABLE     number
    -------------------- ---------- ----------- ----------
    CONTROL FILE                  0           0          0
    REDO LOG                      0           0          0
    ARCHIVED LOG              62.72           0        188
    BACKUP PIECE              11.37           0          2
    IMAGE COPY                    0           0          0
    FLASHBACK LOG               .59           0          4
    FOREIGN ARCHIVED LOG          0           0          0
    
    7 rows selected.
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  • 原文地址:https://www.cnblogs.com/arcer/p/3080869.html
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