Unable to understand meaning of next_time in v$archived_log

hi all,
i am working with 10g standby databases. There are column names FIRST_CHANGE#, FIRST_TIME, NEXT_CHANGE#, NEXT_TIME in v$archived_log. I am unable to understand the exact meaning of these columns by reading the oracle document.
Can somebody explain me the meaning of these columns in v$archived_log.
Same columns are there in v$log_history also but i think there meanings are different as from columns in v$archived_log.
thanks in advance.

Hi,
See, when you referred to "v$archived_log", by the name it depends on the Online Redo Log. See, the columns
FIRST_CHANGE#, FIRST_TIME, NEXT_CHANGE#, NEXT_TIME reflects the changes happened with respect to online redolog, Suppose if the online redo log for first time archived then the respect to record will be appeared, in the "v$archived_log" with respect to details like which is first changed started or done in this particular log and time of it, Next change comes to like a link of next log which happened and respective time. By tracking this details itwill help ful for process to apply the necessary logs on data files at the time of recovery.
Coming to " v$log_history " -> its maintains the history of logs, with respect to SCN numbers, by this we can information which SCN will fall under which log files or existing in which logs. it will have lowest SCN and Highest SCN Numbers with respect to Sequnence number of Log
- Pavan Kumar N

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