What do the column names represent?

In wiew v$flashback_database_stat, there are some columns such as BEGIN_TIM, END_TIM, FLASH_DATA, DB_DATA, REDO_DATA. What do they represent?----No.159
Message was edited by:
frank.qian

From the Reference Guide
http://download-east.oracle.com/docs/cd/B14117_01/server.101/b10755/dynviews_1089.htm#sthref3128
BEGIN_TIME DATE Beginning of the time interval
END_TIME DATE End of the time interval
FLASHBACK_DATA NUMBER Number of bytes of flashback data written during the interval
DB_DATA NUMBER Number of bytes of database data read and written during the interval
REDO_DATA NUMBER Number of bytes of redo data written during the interval
ESTIMATED_FLASHBACK_SIZE NUMBER Value of ESTIMATED_FLASHBACK_SIZE in V$FLASHBACK_DATABASE_LOG at the end of the time interval

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