如何启动postgresql

[postgres@localhost bin]$ postgres -D /opt/postgresql/data/ > /opt/postgresql/log/pg_server.log 2>&1 &

[1] 4508

PGDATA=/opt/postgresql/data

export PGDATA

[postgres@localhost log]$ pg_ctl start -l /opt/postgresql/log/pg_server.log

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

pg_ctl: could not start server

Examine the log output.

[postgres@localhost log]$

[postgres@localhost log]$ cat pg_server.log

FATAL:  lock file "postmaster.pid" already exists

HINT:  Is another postmaster (PID 4491) running in data directory "/opt/postgresql/data"?

[postgres@localhost log]$

[postgres@localhost ~]$ pg_ctl start

server starting

[postgres@localhost ~]$ LOG:  database system was shut down at 2011-07-09 13:58:00 CST

LOG:  autovacuum launcher started

LOG:  database system is ready to accept connections

/opt/postgresql/bin/pg_ctl start -l /opt/postgresql/log/pg_server.log -D /opt/postgresql/data