如何启动postgresql

启动数据库服务器(posgres用户)：

[postgres@localhostbin]$postgres-D/opt/postgresql/data/>/opt/postgresql/log/pg_server.log2>&1&
[1]4508

当然如果设置了环境变量

PGDATA=/opt/postgresql/data
exportPGDATA

后，可使用pg_ctl工具进行启动:

[postgres@localhostlog]$pg_ctlstart-l/opt/postgresql/log/pg_server.log
pg_ctl:anotherservermightberunning;tryingtostartserveranyway
pg_ctl:couldnotstartserver
Examinethelogoutput.
[postgres@localhostlog]$

因为之前已经启动，所以打印“another server might be running”。此时，查看日志，有如下信息:

[postgres@localhostlog]$catpg_server.log
FATAL:lockfile"postmaster.pid"alreadyexists
HINT:Isanotherpostmaster(PID4491)runningindatadirectory"/opt/postgresql/data"?
[postgres@localhostlog]$

当然，最简的启动方式是：

[postgres@localhost~]$pg_ctlstart
serverstarting
[postgres@localhost~]$LOG:databasesystemwasshutdownat2011-07-0913:58:00CST
LOG:autovacuumlauncherstarted
LOG:databasesystemisreadytoacceptconnections

如果要在操作系统启动时就启动PG,可以在/etc/rc.d/rc.local文件中加以下语句：

/opt/postgresql/bin/pg_ctlstart-l/opt/postgresql/log/pg_server.log-D/opt/postgresql/data