关于postgresQL突然退出引发的问题

有时候突然没电导致电脑关机或者别的非正常因素导致postgresQL停止运行，在运行工程时报下面的错误：

“Is the server running on host “localhost” (127.0.0.1) and accepting TCP/IP connections on port 5432?”

然后百度后指引你去 想当然的在终端启动postgresql服务：

pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start

结果终端上又显示了：

pg_ctl: another server might be running; trying to start server anyway

server starting

天啊，怎么办？

别着急 看下log：

cat  /usr/local/var/postgresql/server.log

然后反复报下面这些

FATAL:  lock file "postmaster.pid" already exists

HINT:  Is another postmaster (PID 418) running in data directory "/usr/local/var/postgres"?

FATAL:  lock file "postmaster.pid" already exists

HINT:  Is another postmaster (PID 418) running in data directory "/usr/local/var/postgres"?

FATAL:  lock file "postmaster.pid" already exists

HINT:  Is another postmaster (PID 418) running in data directory "/usr/local/var/postgres"?

FATAL:  lock file "postmaster.pid" already exists

HINT:  Is another postmaster (PID 418) running in data directory "/usr/local/var/postgres"?

好吧告诉你们解决方法：

进入postgresql安装目录，删除掉那个pid文件就一切OK了

不知道怎么进入？

终端直接输入  open /usr/local/var/postgres  把里面那个pid文件干掉