required archivelog files for a guaranteed restore point 查找GRP需要的归档文件

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.2 and later
Information in this document applies to any platform.

Goal

How can you determine the required archivelog files needed for a guaranteed restore point before running flashback database?
 

Solution

The following query should give this information:

   SELECT DISTINCT al.thread#, al.sequence#, al.resetlogs_change#, al.resetlogs_time
    FROM v$archived_log al,
         (select grsp.rspfscn               from_scn,
                 grsp.rspscn                to_scn,
                 dbinc.resetlogs_change#    resetlogs_change#,
                 dbinc.resetlogs_time       resetlogs_time
            from x$kccrsp grsp,  v$database_incarnation dbinc
           where grsp.rspincarn = dbinc.incarnation#
             and bitand(grsp.rspflags, 2) != 0
             and bitand(grsp.rspflags, 1) = 1 -- guaranteed
             and grsp.rspfscn <= grsp.rspscn -- filter clean grp
             and grsp.rspfscn != 0
         ) grsp
      WHERE al.next_change#   >= grsp.from_scn
          AND al.first_change#    <= (grsp.to_scn + 1)
          AND al.resetlogs_change# = grsp.resetlogs_change#
          AND al.resetlogs_time       = grsp.resetlogs_time
          AND al.archived = 'YES';