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## 当前用户表占用空间
```sql
select SEGMENT_NAME as TABLE_NAME,BYTES/1024/1024 as 大小MB
from USER_SEGMENTS
where SEGMENT_TYPE='TABLE'
order by BYTES desc;
```
## 所有用户表占用空间
```sql
select OWNER,SEGMENT_NAME as TABLE_NAME,BYTES/1024/1024 as 大小MB
from DBA_SEGMENTS
where SEGMENT_TYPE='TABLE'
order by OWNER,BYTES desc;
```
## 查询表空间及表空间所占空间大小
```sql
SELECT
tablespace_name,
sum( bytes ) / 1024 / 1024
FROM
dba_data_files
GROUP BY
tablespace_name;
```
## 查询表空间物理文件的名称及大小
```sql
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;
```
## 查询所有表空间以及每个表空间的大小，已用空间，剩余空间，使用率和空闲率
```sql
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;
```
## 查询某个具体的表所占空间的大小
```sql
SELECT
t.segment_name,
t.segment_type,
sum( t.bytes / 1024 / 1024 ) "占用空间(M)"
FROM
dba_segments t
WHERE
t.segment_type = 'TABLE'
AND t.segment_name = 'TABLE_NAME'
GROUP BY
OWNER,
t.segment_name,
t.segment_type;
```
## 查看每个表所占空间大小
```sql
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
;
```