- 相關(guān)推薦
PostgreSQL服務(wù)器啟動及關(guān)閉方法
PostgreSQL采用C/S(客戶機(jī)/服務(wù)器)模式結(jié)構(gòu)。應(yīng)用層通過INET或者Unix Socket利用既定的協(xié)議與數(shù)據(jù)庫服務(wù)器進(jìn)行通信。下面yjbys小編為大家搜集相關(guān)的PostgreSQL服務(wù)器啟動及關(guān)閉方法!
1. 啟動數(shù)據(jù)庫服務(wù)器(posgres用戶):
[postgres@localhost bin]$ postgres -D /opt/postgresql/data/ > /opt/postgresql/log/pg_server.log 2>&1 &
[1] 4508
當(dāng)然如果設(shè)置了環(huán)境變量
PGDATA=/opt/postgresql/data
export PGDATA
后,可使用pg_ctl工具進(jìn)行啟動:
[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]$
因為之前已經(jīng)啟動,所以打印“another server might be running”。此時,查看日志,有如下信息:
[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]$
當(dāng)然,最簡的啟動方式是:
[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
如果要在操作系統(tǒng)啟動時就啟動PG,可以在/etc/rc.d/rc.local 文件中加以下語句:
/opt/postgresql/bin/pg_ctl start -l /opt/postgresql/log/pg_server.log -D /opt/postgresql/data
2.關(guān)閉服務(wù)器
最簡單方法:
[postgres@localhost ~]$ pg_ctl stop
waiting for server to shut down.... done
server stopped
與Oracle相同,在關(guān)閉時也可采用不同的模式,簡介如下:
SIGTERM
不再允許新的連接,但是允許所有活躍的會話正常完成他們的工作,只有在所有會話都結(jié)束任務(wù)后才關(guān)閉。這是智能關(guān)閉。
SIGINT
不再允許新的連接,向所有活躍服務(wù)器發(fā)送 SIGTERM(讓它們立刻退出),然后等待所有子進(jìn)程退出并關(guān)閉數(shù)據(jù)庫。這是快速關(guān)閉。
SIGQUIT
令 postgres 向所有子進(jìn)程發(fā)送 SIGQUIT 并且立即退出(所有子進(jìn)程也會立即退出),而不會妥善地關(guān)閉數(shù)據(jù)庫系統(tǒng)。這是立即關(guān)閉。這樣做會導(dǎo)致下次啟動時的恢復(fù)(通過重放 WAL 日志)。我們推薦只在緊急的時候使用這個方法。
SIGKILL
此選項盡量不要使用,這樣會阻止服務(wù)器清理共享內(nèi)存和信號燈資源,那樣的話你只能在啟動服務(wù)器之前自己手工做這件事。另外,SIGKILL 直接把 postgres 殺掉,而不會等它把信號中繼給它的子進(jìn)程,因此我們還需要手工殺掉每個獨立子進(jìn)程。
使用方法舉例:
[postgres@localhost ~]$ pg_ctl stop -o SIGTERM
LOG: received smart shutdown request
LOG: autovacuum launcher shutting down
waiting for server to shut down....LOG: shutting down
LOG: database system is shut down
done
server stopped
[postgres@localhost ~]$
最快速關(guān)閉方法:kill postgres 進(jìn)程
[postgres@localhost ~]$ kill -INT `head -1 /opt/postgresql/data/postmaster.pid`
[postgres@localhost ~]$ LOG: received fast shutdown request
LOG: aborting any active transactions
LOG: autovacuum launcher shutting down
LOG: shutting down
LOG: database system is shut down
附:postgre啟動后的進(jìn)程,如下:
[postgres@localhost ~]$ ps -ef|grep post
root 4609 4543 0 13:57 pts/2 00:00:00 su - postgres
postgres 4610 4609 0 13:57 pts/2 00:00:00 -bash
postgres 4724 1 0 14:08 pts/2 00:00:00 /opt/postgresql/bin/postgres
postgres 4726 4724 0 14:08 ? 00:00:00 postgres: writer process
postgres 4727 4724 0 14:08 ? 00:00:00 postgres: wal writer process
postgres 4728 4724 0 14:08 ? 00:00:00 postgres: autovacuum launcher process
postgres 4729 4724 0 14:08 ? 00:00:00 postgres: stats collector process
postgres 4752 4610 0 14:11 pts/2 00:00:00 ps -ef
postgres 4753 4610 0 14:11 pts/2 00:00:00 grep post
[postgres@localhost ~]$
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