RMAN备份FORMAT格式中%a的含义
Oracle文档对%a的描述是： %a Specifies the activation ID of the database. rman备份并保存，查询%a RMANgt; backup tabl
Oracle文档对%a的描述是：
rman备份并保存，查询%a
由此，可知%a为：790774120
查询x$kccdi
由此，可知%a便是DIRLC_I
查询v$database_incarnation
由此，可知%a、resetlogs_id和dirlc_i，此三者相同。RESETLOGS_ID显然是由RESETLOGS_TIME决定的。故此三者“同气连技”。
其实这个RESETLOGS_ID的值在V$ARCHIVED_LOG视图中也可以找到。而且这个值对应的就是归档日志格式中的%r。
%r官方文档解释：
如果进行了不完全恢复，这个变量就十分重要。
查询v$archived_log
可知，%r为824467pw
至此，小结：%a、resetlogs_id、dirlc_i和%r，都是oracle database的"生日".
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