[root@st169 /usr/local]# postmaster -i&

[1] 1514

[root@st169 /usr/local]#

"root" execution of the PostgreSQL backend is not permitted.

The backend must be started under it's own userid to prevent

a possible system security compromise. See the INSTALL file for

more information on how to properly start the postmaster.

[1]+ Exit 1 postmaster -i

이런 에러 메시지가 나타나는데...이유를 모르겠어요