--查询表空间使用情况

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                    "空闲空间(M)",

       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 1

--查询表空间的free space

select tablespace_name, count(*) AS extends,round(sum(bytes) / 1024 / 1024, 2) AS MB,sum(blocks) AS blocks from dba_free_space group BY tablespace_name;

--查询表空间的总容量

select tablespace_name, sum(bytes) / 1024 / 1024 as MB from dba_data_files group by tablespace_name;

--查询表空间使用率

SELECT total.tablespace_name,

       Round(total.MB, 2)           AS Total_MB,

       Round(total.MB - free.MB, 2) AS Used_MB,

       Round(( 1 - free.MB / total.MB ) * 100, 2)

       || '%'                       AS Used_Pct

FROM   (SELECT tablespace_name,

               Sum(bytes) / 1024 / 1024 AS MB

        FROM   dba_free_space

        GROUP  BY tablespace_name) free,

       (SELECT tablespace_name,

               Sum(bytes) / 1024 / 1024 AS MB

        FROM   dba_data_files

        GROUP  BY tablespace_name) total

WHERE  free.tablespace_name = total.tablespace_name;

--查出占用的进程

select username,sid,serial# from v$session 

--删掉进程

alter system kill session'156,108';

--删除用户

drop user psyy cascade;