[postgres@uxtest bin]$ ./postmaster /i /S /D /usr/local/pgsql/data/

IpcMemoryCreate: shmget failed (식별자 제거됨) key=5432010, size=144, permission=700

This type of error is usually caused by an improper

shared memory or System V IPC semaphore configuration.

For more information, see the FAQ and platform/specific

FAQ's in the source directory pgsql/doc or on our

web site at http://www.postgresql.org.

IpcMemoryIdGet: shmget failed (식별자 제거됨) key=5432010, size=144, permission=0

IpcMemoryAttach: shmat failed (부적절한 인수) id=/2

FATAL 1: AttachSLockMemory: could not attach segment

[postgres@uxtest bin]$

"postmaster"를 실행시키면 저런 에러가 뜨는데 왜 그런가요?

고수님들의 빠른 답변 부탁드립니다.