根据每日归档的生成量，可以反过来估计每日的数据库活动性及周期性，并决定空间分配的问题！
1.计算归档日志的生产量：
select name,completion_time,BLOCKS * BLOCK_SIZE/1024/1024 MB
from v$archived_log
where rownum < 11 and completion_time between trunc(sysdate) - 2 and trunc(sysdate) - 1;
2.计算某日全天的日志生成计算：
select trunc(completion_time),sum(Mb)/1024 DAY_GB
from(select name,completion_time,BLOCKS*BLOCK_SIZE/1024/1024 Mb from v$archived_log
where COMPLETION_TIME between trunc(sysdate - 2) and trunc(sysdate) - 1)
group by trunc(COMPLETION_TIME)
3.最近日期的日志生成统计
select trunc(completion_time),sum(mb)/1024 day_gb
from(select name,completion_time,blocks*block_size /1024 /1024 mb from v$archived_log)
group by trunc(completion_time)
order by (trunc(completion_time))
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