以 GB 为单位的数据库大小，包括使用空间和可用空间 Oracle DB

Question

大家好，我正在尝试查找以 GB 为单位的数据库大小以及已用空间和可用空间

查询

select round(sum(used.bytes) / 1024 / 1024 / 1024 ) || 'GB' "Database Size"
, round(sum(used.bytes) / 1024 / 1024 / 1024 ) –
round(free.p / 1024 / 1024 / 1024) || 'GB' "Used space"
, round(free.p / 1024 / 1024 / 1024) || 'GB' "Free space"
from (select bytes
from v$datafile
union all
select bytes
from v$tempfile
union all
select bytes
from v$log) used
, (select sum(bytes) as p
from dba_free_space) free
group by free.p
/

错误

ORA-00911: invalid character
00911. 00000 -  "invalid character"
*Cause:    identifiers may not start with any ASCII character other than
           letters and numbers.  $#_ are also allowed after the first
           character.  Identifiers enclosed by doublequotes may contain
           any character other than a doublequote.  Alternative quotes
           (q'#...#') cannot use spaces, tabs, or carriage returns as
           delimiters.  For all other contexts, consult the SQL Language
           Reference Manual.
*Action:
Error at Line: 2 Column: 48

尝试后仍然无法纠正错误，有什么建议吗？

Answer 1

错误消息指的是第 2 行的第 48 个字符。“减号”字符是 en-dash，而不是 hyphen/minus。你可以通过dumping the characters看到区别。

您可能有意外的类型，或者可能是从 Word 文档中复制和粘贴的类型。这也可能导致“智能”引号出现问题，有时甚至会导致空格问题。

重新输入字符，它应该可以工作。

select round(sum(used.bytes) / 1024 / 1024 / 1024 ) || 'GB' "Database Size"
, round(sum(used.bytes) / 1024 / 1024 / 1024 ) -
round(free.p / 1024 / 1024 / 1024) || 'GB' "Used space"
...