85 lines
No EOL
2.2 KiB
Markdown
85 lines
No EOL
2.2 KiB
Markdown
## 当前用户表占用空间
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```sql
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select SEGMENT_NAME as TABLE_NAME,BYTES/1024/1024 as 大小MB
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from USER_SEGMENTS
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where SEGMENT_TYPE='TABLE'
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order by BYTES desc;
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```
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## 所有用户表占用空间
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```sql
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select OWNER,SEGMENT_NAME as TABLE_NAME,BYTES/1024/1024 as 大小MB
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from DBA_SEGMENTS
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where SEGMENT_TYPE='TABLE'
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order by OWNER,BYTES desc;
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```
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## 查询表空间及表空间所占空间大小
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```sql
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SELECT
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tablespace_name,
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sum( bytes ) / 1024 / 1024
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FROM
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dba_data_files
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GROUP BY
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tablespace_name;
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```
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## 查询表空间物理文件的名称及大小
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```sql
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SELECT
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a.tablespace_name,
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total,
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free,
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total - free AS used,
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substr( free / total * 100, 1, 5 ) AS "FREE%",
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substr( ( total - free ) / total * 100, 1, 5 ) AS "USED%"
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FROM
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(SELECT tablespace_name, sum( bytes ) / 1024 / 1024 AS total FROM dba_data_files GROUP BY tablespace_name) a,
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(SELECT tablespace_name, sum( bytes ) / 1024 / 1024 AS free FROM dba_free_space GROUP BY tablespace_name) b
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WHERE
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a.tablespace_name = b.tablespace_name
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ORDER BY
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a.tablespace_name;
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```
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## 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
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```sql
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SELECT
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a.tablespace_name,
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total,
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free,
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total - free AS used,
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substr( free / total * 100, 1, 5 ) AS "FREE%",
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substr( ( total - free ) / total * 100, 1, 5 ) AS "USED%"
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FROM
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(SELECT tablespace_name, sum( bytes ) / 1024 / 1024 AS total FROM dba_data_files GROUP BY tablespace_name) a,
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(SELECT tablespace_name, sum( bytes ) / 1024 / 1024 AS free FROM dba_free_space GROUP BY tablespace_name) b
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WHERE
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a.tablespace_name = b.tablespace_name
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ORDER BY
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a.tablespace_name;
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```
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## 查询某个具体的表所占空间的大小
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```sql
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SELECT
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t.segment_name,
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t.segment_type,
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sum( t.bytes / 1024 / 1024 ) "占用空间(M)"
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FROM
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dba_segments t
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WHERE
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t.segment_type = 'TABLE'
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AND t.segment_name = 'TABLE_NAME'
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GROUP BY
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OWNER,
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t.segment_name,
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t.segment_type;
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```
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## 查看每个表所占空间大小
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```sql
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select * from (
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select t.tablespace_name,t.owner, t.segment_name, t.segment_type, sum(t.bytes / 1024 / 1024) mb
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from dba_segments t
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where t.segment_type='TABLE'
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group by t.tablespace_name,t.OWNER, t.segment_name, t.segment_type
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) t
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order by t.mb desc
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;
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``` |