为什么PostgreSQL的shell向我显示了一个不同的OS版本而不是我的真实操作系统？

Question

When I execute the following command:

SELECT version();

I get:

PostgreSQL 9.6.3 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-16), 64-bit

What does Red Hat 4.4.7-16 means? I am running PostgreSQL on Debian 9 so, why this shows me Red Hat instead?

Answer 1

It does not report your OS, but the software it was compiled with, ie GCC compiler version 4.4.7. More specifically: 4.4.7-16 (update 16) on Red Hat OS.

Your are running on x86_64-pc-linux-gnu (that is Debian 9 I suspect). See uname -a .

Just checked one of our servers (Debian 8):

PostgreSQL 9.6.4 on x86_64-pc-linux-gnu, compiled by gcc (Debian 4.9.2-10) 4.9.2, 64-bit

So, the Debian version should be built on Debian. See comment tadman.