创建视图，查询表空间的利用情况

首先创建视图：
create or replace view dba_tablespace_free as
select a.tablespace_name,a.total_space_mb allocated_space_mb,round(b.free_space_mb,2) free_space_mb,(a.max_space-a.total_space_mb) free_allocate_mb,round(a.max_space,2) max_space_mb,
round((a.total_space_mb-b.free_space_mb)/a.total_space_mb*100,2) pct_usage,round(a.total_space_mb/a.max_space*100,2) pct_allocated
from (select tablespace_name,sum(bytes)/1024/1024 total_space_Mb,decode(sum(maxbytes/1024/1024),0,
sum(bytes)/1024/1024,sum(case when AUTOEXTENSIBLE='YES' then maxbytes
else bytes end)/1024/1024) max_space
from dba_data_files group by tablespace_name)a,(select tablespace_name, sum((bytes)/1024/1024) free_space_Mb
from dba_free_space group by tablespace_name) b where a.tablespace_name=b.tablespace_name;
报错：01031:insufficient privileges

赋权：SQL> grant select any table to chenjh;
SQL> grant select any dictionary to chenjh;
SQL> grant select any table,create view to chenjh;

赋权后再创建视图成功：



查询此视图：
SELECT UPPER(F.TABLESPACE_NAME) "表空间名",
　　D.TOT_GROOTTE_MB "表空间大小(M)",
　　D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
　　TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,2),'990.99') || '%' "使用比",
　　F.TOTAL_BYTES "已扩展空闲空间(M)",
(SELECT free_space_mb+free_allocate_mb FROM dba_tablespace_free a where a.tablespace_name= f.tablespace_name) "总剩余空间",
　　F.MAX_BYTES "最大块(M)"
　　FROM (SELECT TABLESPACE_NAME,
　　ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,
　　ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES
　　FROM SYS.DBA_FREE_SPACE
　　GROUP BY TABLESPACE_NAME) F,
　　(SELECT DD.TABLESPACE_NAME,
　　ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB
　　FROM SYS.DBA_DATA_FILES DD
　　GROUP BY DD.TABLESPACE_NAME) D
　　WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME
　　ORDER BY 3 desc;
效果图：