oracle表空间有关的查询语句

--合并表空间大小

alter tablespace users coalesce

--查询数据文件

select file_name,file_id from dba_data_files

--查询数据库对象占空间大小

select owner,segment_name,sum(bytes) from dba_extents where file_id=4 group by owner,segment_name order by sum(bytes) desc

select sum(bytes),tablespace_name from dba_free_space group by tablespace_name order by 1 desc

--修改数据文件大小

alter database datafile 'D:\ORACLE11GXE\APP\ORACLE\ORADATA\XE\USERS.DBF' resize 7000M;

--查询表空间利用率

select  s.tablespace_name,

       round(sum(s.bytes / 1024 / 1024), 2) as Space,

       round((sum(s.bytes / 1024 / 1024) - nvl(d.fr,0)), 2) used,

       nvl(round(d.fr, 2),0) free,

       decode(round(sum(s.maxbytes / 1024 / 1024 / 1024), 2),0,'NO','YES') auto_extend,

       round(sum(s.maxbytes / 1024 / 1024 / 1024), 2) MaximumGB

  from dba_data_files s,

       (select c.tablespace_name,

               round(sum(c.bytes / 1024 / 1024), 2) fr

          from dba_free_space c

         group by c.tablespace_name) d

 where s.tablespace_name = d.tablespace_name(+)

 group by s.tablespace_name,d.fr

 order by s.tablespace_name

 --查询表空间状态

 select file_id,file_name,tablespace_name,AUTOEXTENSIBLE  from dba_data_files;