oracle查看表空间已分配和未分配空间的语句分享
selectb.tablespace_name,mbytes_alloc,mbytes_free
from(select round(sum(bytes)/1024/1024) mbytes_free,tablespace_name
from dba_free_space
group by tablespace_name) a,
(select round(sum(bytes)/1024/1024) mbytes_alloc,tablespace_name
from dba_data_files
group by tablespace_name) b
where a.tablespace_name(+)=b.tablespace_name
and b.tablespace_name='USERS'
/
https://www.uoften.com/dbs/oracle/20180415/73070.html
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