PostgreSQL三种关闭方式的区别

1、使用smart参数关闭数据库:

smart:最为安全,但最慢,需要将所有连接都断开后,才会关库,默认关库模式。

smart: 等所有的连接中止后,关闭数据库。如果客户端连接不终止, 则无法关闭数据库。

postgresql@master \~\]$ pg_ctl stop -D $PGDATA -m smart waiting for server to shut down.... done server stopped \[postgresql@master \~\]$ **使用smart参数关闭数据库的日志:** 2025-09-06 19:40:20.479 CST \[56233\] LOG: received smart shutdown request 2025-09-06 19:40:20.480 CST \[56233\] LOG: background worker "logical replication launcher" (PID 56241) exited with exit code 1 2025-09-06 19:40:20.480 CST \[56236\] LOG: shutting down 2025-09-06 19:40:20.485 CST \[56233\] LOG: database system is shut down **2、使用fast参数关闭数据库:** fast:强制中断会话,而不管有操作有没有提交,在做系统维护(系统维护时一般应用都正常关闭了,或者不再会有事务操作。)时,需要这种模式来关闭数据库。 fast: 快速关闭数据库, 断开客户端的连接,让已有的事务回滚,然后正常关闭数据库。 \[postgresql@master \~\]$ pg_ctl stop -D $PGDATA -m fast waiting for server to shut down.... done server stopped \[postgresql@master \~

使用fast参数关闭数据库的日志:

2025-09-06 19:40:59.477 CST [56258] LOG: received fast shutdown request

2025-09-06 19:40:59.478 CST [56258] LOG: aborting any active transactions

2025-09-06 19:40:59.478 CST [56258] LOG: background worker "logical replication launcher" (PID 56266) exited with exit code 1

2025-09-06 19:40:59.479 CST [56261] LOG: shutting down

2025-09-06 19:40:59.484 CST [56258] LOG: database system is shut down

3、使用immediate参数关闭数据库:

immediate:最暴力的方式,不管数据有没有落盘(POSGRE是遵循WAL机制),就直接关掉,待启动时进行实例恢复,如果在关库前有大量的事务没有写入磁盘,那这个恢复过程可能会非常的漫长。

immediate: 立即关闭数据库,立即停止数据库进程,直接退出,下次启动时会进行实例恢复。

postgresql@master \~\]$ pg_ctl stop -D $PGDATA -m immediate waiting for server to shut down.... done server stopped \[postgresql@master \~\]$ **使用immediate参数关闭数据库的日志:** 2025-09-06 19:41:40.311 CST \[56278\] LOG: received immediate shutdown request 2025-09-06 19:41:40.313 CST \[56284\] WARNING: terminating connection because of crash of another server process 2025-09-06 19:41:40.313 CST \[56284\] DETAIL: The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory. 2025-09-06 19:41:40.313 CST \[56284\] HINT: In a moment you should be able to reconnect to the database and repeat your command. 2025-09-06 19:41:40.315 CST \[56278\] LOG: database system is shut down **4、数据目录:** \[postgresql@master \~\]$ echo $PGDATA /usr/local/postgresql/data **5、启动数据库:** \[postgresql@master \~\]$ pg_ctl start -D $PGDATA waiting for server to start....2025-09-06 19:40:40.221 CST \[56258\] LOG: redirecting log output to logging collector process 2025-09-06 19:40:40.221 CST \[56258\] HINT: Future log output will appear in directory "log". done server started \[postgresql@master \~\]$

相关推荐
阿里小阿希10 小时前
Vue3 + Element Plus 项目中日期时间处理的最佳实践与数据库设计规范
数据库·设计规范
白鹭11 小时前
MySQL源码部署(rhel7)
数据库·mysql
666和77711 小时前
Struts2 工作总结
java·数据库
还听珊瑚海吗12 小时前
SpringMVC(一)
数据库
星期天要睡觉13 小时前
MySQL 综合练习
数据库·mysql
Y40900113 小时前
数据库基础知识——聚合函数、分组查询
android·数据库
JosieBook14 小时前
【数据库】MySQL 数据库创建存储过程及使用场景详解
数据库·mysql