=?UTF-8?B?c3F1aWQgd2FyZA==?= <squidw@mail.ru> writes:
> Question is why directory name not equal as database name?
Because (1) it doesn't work for database names that aren't legal as
filenames (according to the none-too-well-standardized rules of your
particular filesystem); (2) SQL requires us to treat "FOO" and "foo"
as distinct names, but the filesystem might not; (3) renaming a database
is dangerous, as there's no way to make the directory rename action
atomic with commit of the system catalog updates; (4) renaming a database
causes problems for concurrent sessions that might be in the middle of
opening files in that database. And probably a few other reasons I
don't recall off the top of my head.
> Can i change it?
No.
regards, tom lane