摘要： 1.查看表空间大小及已经使用的百分比select a.tablespace_name,a.bytes/1024/1024 "Sum MB", (a.bytes-b.bytes)/1024/1024 "used MB", b.bytes/1024/1024 "free MB", round(((a.bytes-b.bytes)/a.bytes)*100,2) "percent_used" from (select tablespace_name,sum(bytes) bytes from dba_data_files 阅读全文