oracle数据库里查看表空间使用状况

oracle表空间的事情状况要经常查看,一般空闲比例过低的时候就应该考虑增大表看空间了。查看方法如下SQL:

方法一:

select dbf.tablespace_name,
dbf.totalspace "总量(M)",
dbf.totalblocks as 总块数,
dfs.freespace "剩余总量(M)",
dfs.freeblocks "剩余块数",
(dfs.freespace / dbf.totalspace) * 100 "空闲比例"
from (select t.tablespace_name,
sum(t.bytes) / 1024 / 1024 totalspace,
sum(t.blocks) totalblocks
from dba_data_files t
group by t.tablespace_name) dbf,
(select tt.tablespace_name,
sum(tt.bytes) / 1024 / 1024 freespace,
sum(tt.blocks) freeblocks
from dba_free_space tt
group by tt.tablespace_name) dfs
where trim(dbf.tablespace_name) = trim(dfs.tablespace_name)

方法二:

SELECT Total.name "Tablespace Name",
Free_space, (total_space-Free_space) Used_space, total_space
FROM
(select tablespace_name, sum(bytes/1024/1024) Free_Space
from sys.dba_free_space
group by tablespace_name
) Free,
(select b.name, sum(bytes/1024/1024) TOTAL_SPACE
from sys.v_$datafile a, sys.v_$tablespace B
where a.ts# = b.ts#
group by b.name
) Total
WHERE Free.Tablespace_name = Total.name

当发现有的表空间不够的错误时,处理如下:

1:找出该表空间对应的数据文件及路径

select * from dba_data_files t
where t.tablespace_name = 'ARD'

2:增大数据文件

alter database datafile '全路径的数据文件名称' resize ***M

3:增加数据文件

alter tablespace 表空间名称

add datafile '全路径的数据文件名称' ***M

注解:表空间尽量让free百分比保持在10%以上,如果低于10%就增加datafile或者resizedatafile,一般数据文件不要超过2G。