oracle关于查询空间使用情况的几个sql语句

1、查看表空间使用率

col Tablespace format a24

col "% Used" for 99.99

select df.tablespace_name "Tablespace",df.bytes/(1024*1024) "Total Size(MB)",

sum(fs.bytes)/(1024*1024) "Free Size(MB)", round(sum(fs.bytes)*100/df.bytes) "% Free",

round((df.bytes-sum(fs.bytes))*100/df.bytes,2) "% Used"

from dba_free_space fs,

(select tablespace_name, sum(bytes) bytes from dba_data_files group by tablespace_name ) df

where fs.tablespace_name = df.tablespace_name

group by df.tablespace_name, df.bytes;

2、所有表空间总大小

select sum(bytes)/(1024*1024*1024) "Total Size(GB)" from dba_data_files;

3、所有表空间剩余大小

select sum(bytes)/(1024*1024*1024) "Total Size(GB)" from dba_free_space;

4、业务表空间总大小（业务表空间在这里指的是表空间大小>20G的表空间）

select sum(df.bytes) / (1024 * 1024 * 1024) total

from (select tablespace_name, sum(bytes) bytes

from dba_data_files

group by tablespace_name) df

where (df.bytes / (1024 * 1024 * 1024)) > 20;

5、业务表空间剩余大小

select sum(fs.bytes) total

from (select tablespace_name, sum(bytes) / (1024 * 1024 * 1024) bytes

from dba_free_space

group by tablespace_name) fs

where fs.tablespace_name in

(select tablespace_name

from (select tablespace_name, sum(bytes) bytes

from dba_data_files

group by tablespace_name) df

where (df.bytes / (1024 * 1024 * 1024)) > 20);