表空间

查询所有表空间
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);
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查看当前用户的缺省表空间
select username,default_tablespace from user_users;