注意存在表空间不存在于dba_free_space 中（可能是因为表空间过大已爆掉）

--1、查看表空间的名称及大小

SELECT t.tablespace_name, round(SUM(bytes / (1024 * 1024)), 0) ts_size

FROM dba_tablespaces t, dba_data_files d

WHERE t.tablespace_name = d.tablespace_name

GROUP BY t.tablespace_name;

--2、查看表空间物理文件的名称及大小

SELECT tablespace_name,

file_id,

file_name,

round(bytes / (1024 * 1024), 0) total_space

FROM dba_data_files

ORDER BY tablespace_name;

--3、查看回滚段名称及大小

SELECT segment_name,

tablespace_name,

r.status,

(initial_extent / 1024) initialextent,

(next_extent / 1024) nextextent,

max_extents,

v.curext curextent

FROM dba_rollback_segs r, v$rollstat v

WHERE r.segment_id = v.usn(+)

ORDER BY segment_name;

--4、查看控制文件

SELECT NAME FROM v$controlfile;

--5、查看日志文件

SELECT MEMBER FROM v$logfile;

--6、查看表空间的使用情况

SELECT SUM(bytes) / (1024 * 1024) AS free_space, tablespace_name

FROM dba_free_space

GROUP BY tablespace_name;

SELECT a.tablespace_name,

a.bytes total,

b.bytes used,

c.bytes free,

(b.bytes * 100) / a.bytes "% USED ",

(c.bytes * 100) / a.bytes "% FREE "

FROM sys.sm$ts_avail a, sys.sm$ts_used b, sys.sm$ts_free c

WHERE a.tablespace_name = b.tablespace_name

AND a.tablespace_name = c.tablespace_name;

--7、查看数据库库对象

SELECT owner, object_type, status, COUNT(*) count#

FROM all_objects

GROUP BY owner, object_type, status;

--8、查看数据库的版本　

SELECT version

FROM product_component_version

WHERE substr(product, 1, 6) = 'Oracle';

--9、查看数据库的创建日期和归档方式

SELECT created, log_mode, log_mode FROM v$database; 

 

--1G=1024MB

--1M=1024KB

--1K=1024Bytes

--1M=11048576Bytes

--1G=1024*11048576Bytes=11313741824Bytes

SELECT a.tablespace_name "表空间名",

total "表空间大小",

free "表空间剩余大小",

(total - free) "表空间使用大小",

total / (1024 * 1024 * 1024) "表空间大小(G)",

free / (1024 * 1024 * 1024) "表空间剩余大小(G)",

(total - free) / (1024 * 1024 * 1024) "表空间使用大小(G)",

round((total - free) / total, 4) * 100 "使用率 %"

FROM (SELECT tablespace_name, SUM(bytes) free

FROM dba_free_space

GROUP BY tablespace_name) a,

(SELECT tablespace_name, SUM(bytes) total

FROM dba_data_files

GROUP BY tablespace_name) b

WHERE a.tablespace_name = b.tablespace_name 

 

数据库会存在temp表空间

查询temp表空间和使用情况时需要单独的脚本

select d.tablespace_name,

space "sum_space(m)",

blocks sum_blocks,

used_space "used_space(m)",

round(nvl(used_space, 0) / space * 100, 2) "used_rate(%)",

nvl(free_space, 0) "free_space(m)"

from (select tablespace_name,

round(sum(bytes) / (1024 * 1024), 2) space,

sum(blocks) blocks

from dba_temp_files

group by tablespace_name) d,

(select tablespace_name,

round(sum(bytes_used) / (1024 * 1024), 2) used_space,

round(sum(bytes_free) / (1024 * 1024), 2) free_space

from v$temp_space_header

group by tablespace_name) f

where d.tablespace_name = f.tablespace_name(+)

TABLESPACE_NAME sum_space(m) SUM_BLOCKS used_space(m) used_rate(%) free_space(m)

但这种情况并不能表示目前临时表空间的使用情况，比如某临时表空间已经使用了100%，该操作完毕后，临时表空间的HWM标志没有被回收，所以如果想知道当前的临时表空间使用，需要通过v$sort_usgae来确定：

select sum(blocks*8192)/1024/1024 from v$sort_usage;

临时表空间，请查询DBA_TEMP_FREE_SPACE

SELECT TABLESPACE_NAME, FREE_SPACE/1024/1024 AS "FREE SPACE(M)"

  FROM DBA_TEMP_FREE_SPACE

WHERE TABLESPACE_NAME = '&tablespace_name';

临时表空间，请查询DBA_TEMP_FILES

SELECT TABLESPACE_NAME, FILE_ID, FILE_NAME, BYTES/1024/1024 AS "SPACE(M)"

  FROM DBA_TEMP_FILES

WHERE TABLESPACE_NAME = '&tablespace_name';

为空间不足的表空间增加数据文件

ALTER TABLESPACE &tablespace_name ADD DATAFILE '&datafile_name' SIZE 2G;

注：如果要为临时表空间扩容，使用下面的语句

ALTER TABLESPACE &tablespace_name ADD TEMPFILE '&datafile_name' SIZE 2G;

也可以修改数据文件的大小