--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;

?

1.建立表空间:

create tablespace test datafile '/u01/test.dbf'? size 10M uniform size 128k #指定区尺寸为128k ,块大小为默认8K?? #大文件表空间 create bigfile tablespace big_tbs datafile? '/u01/big_tbs.dbf ' size 100G

?

2.建非标准表

show parameter db alter system set db_2k_cache_size=10M create tablespace test datafile '/u01/test.dbf' size 10M blocksize 2K uniform size 128k?? #常见错误 SQL> alter system set db_2k_cache_size=2M; alter system set db_2k_cache_size=2M ERROR at line 1: ORA-02097: parameter cannot be modified because specified value is invalid ORA-00384: Insufficient memory to grow cache #解决 SQL> alter system set sga_max_size=400M scope=spfile; SQL> shutdown immediate; SQL> startup SQL> alter system set db_2k_cache_size=10M; System altered.

?

3.查看区大小与块大小

#区大小 conn y / 123 create table t(i number) tablespace test; Insert into t values(10) select bytes/1024 from user_segments where segment_name=upper('t'); #块大小 Show parameter block(默认64K) #非标准表空间的blocksize SQL> select * from v$dbfile; SQL> select name,block_size,status from v$datafile; SQL> select block_size from v$datafile where file#=14;

?

4.删除表空间

drop tablespace test including contents and datafiles

?

5.查表空间:

#查数据文件 select * from v$dbfile; #所有表空间 select * from v$tablespace; #表空间的数据文件 select file_name,tablespace_name from dba_data_files;

?

6.建立undo表空间

create undo tablespace undotbs01 datafile '/u01/undotbs01.dbf' size 5M; #切换到新建的undo表空间 alter system set undo_tablespace=undotbs01;

?

7.建立临时表空间

create temporary tablespace temp_data tempfile '/u01/temp.db'? size 5M; create bigfile temporary tablespace bigtem tempfile '/u01/bigtemp.db'? size 5M;

?

8.改变表空间状态
(0.)查看状态#表空间状态 select tablespace_name,block_size,status from dba_tablespaces; #数据文件状态 select name,block_size,status from v$datafile;

(1.)表空间脱机alter tablespace test offline #如果意外删除了数据文件 alter tablespace test offline for recover

(2.)表空间联机alter tablespace test online

(3.)数据文件脱机select * from v$dbfile; alter database datafi