监控flash_recovery_area的使用情况

监控flash_recovery_area的使用情况可以查询2个视图:

1.V$FLASH_RECOVERY_AREA_USAGE:displays usage information about flashback recovery areas

SQL >   select   *   from  v$flash_recovery_area_usage;

FILE_TYPE            PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES
-- ------------------ ------------------ ------------------------- ---------------
CONTROL  FILE                            0                           0                 0
REDO  LOG                                0                           0                 0
ARCHIVED  LOG                        30.81                           0                61
BACKUP  PIECE                           0                           0                 0
IMAGE  COPY                             0                           0                 0
FLASHBACK  LOG                       12.99                        8.54                70
FOREIGN  ARCHIVED  LOG                    0                           0                 0

已选择7行。

SQL >   select   sum (PERCENT_SPACE_USED)  from  v$flash_recovery_area_usage;

SUM (PERCENT_SPACE_USED)
-- ---------------------
                    43.8

2.V$RECOVERY_FILE_DEST:displays information about the disk quota and current disk usage in the flash recovery area.

SQL >   select   *   from  V$RECOVERY_FILE_DEST;

NAME                                     SPACE_LIMIT SPACE_USED SPACE_RECLAIMABLE NUMBER_OF_FILES
-- -------------------------------------- ----------- ---------- ----------------- ---------------
/ opt / oracle / flash_recovery_area            8589934592   3762538496           733315072               131

SQL >   select   round ( 100 * (a.space_used / space_limit), 2 )  from  v$recovery_file_dest a;

ROUND ( 100 * (A.SPACE_USED / SPACE_LIMIT), 2 )
-- -------------------------------------
                                    43.8

--本篇文章转自：http://www.blogjava.net/KingKong/archive/2011/05/30/351332.html