----查看表空间大小-----
select tablespace_name, sum(bytes),file_name from dba_data_files group by tablespace_name,file_name;
-----查看表空间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;
--------查看表空间使用情况-------------
select upper(f.tablespace_name) "表空间名",
d.tot_grootte_mb "表空间小(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 "最快(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
-----删除表空间下所有表----
select 'Drop table ' ||table_name|| ';'
from user_tables
where tablespace_name='YBTTBSPACE'
-----表空间相关的三个系统表---
dba_free_tablepsace
all_tablespace
---------重建新的临时表空间并进行切换----------
SQL> create temporary tablespace temp tempfile '/opt/oracle/oradata/conner/temp1.dbf' size 10M;
Tablespace created.
SQL> alter tablespace temp add tempfile '/opt/oracle/oradata/conner/temp2.dbf' size 20M;
Tablespace altered.
SQL> alter database default temporary tablespace temp;
Database altered.
SQL> select username,temporary_tablespace from dba_users;
USERNAME TEMPORARY_TABLESPACE