--查看數據庫表空間文件
select * from dba_data_files;

--查看所有表空間的總容量
select dba.TABLESPACE_NAME, sum(bytes)/1024/1024 as MB  
from dba_data_files dba 
group by dba.TABLESPACE_NAME;

--查看數據庫表空間使用率
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 
order by used_pct desc;

--查看表空間總大小、使用率、剩余空間
select a.tablespace_name, total, free, total-free as used, substr(free/total * 100, 1, 5) as "FREE%", substr((total - free)/total * 100, 1, 5) as "USED%"
from
(select tablespace_name, sum(bytes)/1024/1024 as total from dba_data_files group by tablespace_name) a,
(select tablespace_name, sum(bytes)/1024/1024 as free from dba_free_space group by tablespace_name) b
where a.tablespace_name = b.tablespace_name
order by a.tablespace_name

--查看表空間使用率(包含臨時表空間)
select * from (
Select a.tablespace_name,
(a.bytes- b.bytes) "表空間使用大小(BYTE)",
a.bytes/(1024*1024*1024) "表空間大小(GB)",
b.bytes/(1024*1024*1024) "表空間剩余大小(GB)",
(a.bytes- b.bytes)/(1024*1024*1024) "表空間使用大小(GB)",
to_char((1 - b.bytes/a.bytes)*100,'99.99999') || '%' "使用率"
from (select tablespace_name,
sum(bytes) bytes
from dba_data_files
group by tablespace_name) a,
(select tablespace_name,
sum(bytes) bytes
from dba_free_space
group by tablespace_name) b
where a.tablespace_name = b.tablespace_name
union all
select c.tablespace_name,
d.bytes_used "表空間使用大小(BYTE)",
c.bytes/(1024*1024*1024) "表空間大小(GB)",
(c.bytes-d.bytes_used)/(1024*1024*1024) "表空間剩余大小(GB)",
d.bytes_used/(1024*1024*1024) "表空間使用大小(GB)",
to_char(d.bytes_used*100/c.bytes,'99.99999') || '%' "使用率"
from
(select tablespace_name,sum(bytes) bytes
from dba_temp_files group by tablespace_name) c,
(select tablespace_name,sum(bytes_cached) bytes_used
from v$temp_extent_pool group by tablespace_name) d
where c.tablespace_name = d.tablespace_name
)
order by tablespace_name

--查看具體表的占用空間大小
select * from (
select t.tablespace_name,t.owner, t.segment_name, t.segment_type, sum(t.bytes / 1024 / 1024) mb
from dba_segments t
where t.segment_type='TABLE'
group by t.tablespace_name,t.OWNER, t.segment_name, t.segment_type
) t
order by t.mb desc

alter database datafile ‘...\system_01.dbf' autoextend on;
alter database datafile ‘...\system_01.dbf' resize 1024M;

alter tablespace SYSTEM add datafile '/****' size 1000m autoextend on next 100m;

alter tablespace TEMP01 add tempfile'/****' size 1000m autoextend on next 100m;

--1.查看當前的數據庫默認表空間：
select * from database_properties
where property_name='DEFAULT_TEMP_TABLESPACE';

--2.創建新的臨時表空間
create temporary tablespace TEMP01 tempfile 
'/home/temp01.dbf' size 31G;

--3.更改默認臨時表空間
alter database default temporary tablespace TEMP01;

--4.刪除原來的臨時表空間
drop tablespace TEMP02 including contents and datafiles;

--如果刪除原來臨時表空間報錯ORA-60100：由于排序段，已阻止刪除表空間...
--（說明有語句正在使用原來的臨時表空間，需要將其kill掉再刪除，此語句多為排序的語句）
--查詢語句
Select se.username,se.sid,se.serial#,su.extents,su.blocks*to_number(rtrim(p.value))as Space,
tablespace,segtype,sql_text
from v$sort_usage su,v$parameter p,v$session se,v$sql s
where p.name='db_block_size' and su.session_addr=se.saddr and s.hash_value=su.sqlhash
and s.address=su.sqladdr
order by se.username,se.sid;

--刪除對應的'sid,serial#'
alter system kill session 'sid,serial#'

--查看表空間是否具有自動擴展的能力     
SELECT T.TABLESPACE_NAME,D.FILE_NAME,     
D.AUTOEXTENSIBLE,D.BYTES,D.MAXBYTES,D.STATUS     
FROM DBA_TABLESPACES T,DBA_DATA_FILES D     
WHERE T.TABLESPACE_NAME =D.TABLESPACE_NAME     
 ORDER BY TABLESPACE_NAME,FILE_NAME;