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$archived_log
where rownum
2.计算某日全天的日志生成计算：
select trunc(completion_time),sum(Mb)/1024 DAY_GB
from(select name,completion_time,BLOCKS*BLOCK_SIZE/1024/1024 Mb from v$archived_log
where COMPLETION_TIME between trunc(sysdate - 2) and trunc(sysdate) - 1)
group by trunc(COMPLETION_TIME)
1.计算归档日志的生产量：
select name,completion_time,BLOCKS * BLOCK_SIZE/1024/1024 MB
from v$archived_log
where rownum
2.计算某日全天的日志生成计算：
select trunc(completion_time),sum(Mb)/1024 DAY_GB
from(select name,completion_time,BLOCKS*BLOCK_SIZE/1024/1024 Mb from v$archived_log
where COMPLETION_TIME between trunc(sysdate - 2) and trunc(sysdate) - 1)
group by trunc(COMPLETION_TIME)
ops$admin@dw1>select trunc(completion_time),sum(Mb)/1024 DAY_GB
2 from(select name,completion_time,BLOCKS*BLOCK_SIZE/1024/1024 Mb from v$archived_log
3 where COMPLETION_TIME between trunc(sysdate - 2) and trunc(sysdate) - 1)
4 group by trunc(COMPLETION_TIME);
TRUNC(COMPLETION_T DAY_GB
---------------------------- ----------
31-AUG-11 511.713791
====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$archived_log)
group by trunc(completion_time)
order by (trunc(completion_time))
from(select name,completion_time,blocks*block_size /1024 /1024 mb from v$archived_log)
group by trunc(completion_time)
order by (trunc(completion_time))
