我在Windows 10上从Postgresql 11升级到Postgresql 12的解决方案如下。

首先，你需要能够停止和启动Postgresql服务。您可以在Powershell中通过以下命令完成此操作。

开始: pg_ctl start -D " d:\postgresql\11\data "

站: pg_ctl stop -D " d:\postgresql\11\data "

状态: pg_ctl status -D " d:\postgresql\11\data "

在进行升级之前进行备份是明智的。Postgresql 11实例必须正在运行。然后复制全局函数

pg_dumpall -U postgres -g -f d:\bakup\postgresql\11\globals.sql

然后是每个数据库

pg_dump -U postgres -Fc <database> > d:\backup\postgresql\11\<database>.fc

or

pg_dump -U postgress -Fc -d <database> -f d:\backup\postgresql\11\<database>.fc . d:\backup\postgresql\11\<database>.fc . d:\backup\postgresql\11\

如果还没有安装Postgresql 12 (Postgresql 11也安装在5433端口上)

然后按如下步骤进行升级:

1)停止Postgresql 11服务(见上文)

2)编辑d:\postgresql\12\data目录下的postgresql.conf文件，将port = 5433修改为port = 5432

3)编辑windows用户环境路径(windows start然后输入env)指向Postgresql 12而不是Postresql 11

4)执行upgrade，输入如下命令。

pg_upgrade `
-b “c:\program files\postgresql\11\bin” `
-B “c:\program files\postgresql\12\bin” `
-d “d:\postgresql\11\data” `
-D “d:\postgresql\12\data” --username=postgres

(在powershell中使用反引号(或反引号)'来继续下一行的命令)

5)最后启动新的Postgresql 12服务

pg_ctl start -D " d:\postgresql\12\data "

站在其他可怜的动物的肩膀上，踩着淤泥，我能够按照以下步骤重新站起来，并在约塞米蒂升级后运行:

假设您已经使用自制程序安装和升级Postgres，您可以执行以下步骤。

Stop current Postgres server: launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist Initialize a new 9.4 database: initdb /usr/local/var/postgres9.4 -E utf8 Install postgres 9.3 (as it was no longer present on my machine): brew install homebrew/versions/postgresql93 Add directories removed during Yosemite upgrade: mkdir -p /usr/local/var/postgres/{pg_tblspc,pg_twophase,pg_stat_tmp}/touch /usr/local/var/postgres/{pg_tblspc,pg_twophase,pg_stat_tmp}/.keep run pg_upgrade: pg_upgrade -v -d /usr/local/var/postgres -D /usr/local/var/postgres9.4 -b /usr/local/Cellar/postgresql93/9.3.5/bin/ -B /usr/local/Cellar/postgresql/9.4.0/bin/ Move new data into place: cd /usr/local/var mv postgres postgres9.3 mv postgres9.4 postgres Restart Postgres: launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist Check /usr/local/var/postgres/server.log for details and to make sure the new server started properly. Finally, re-install related libraries? pip install --upgrade psycopg2 gem uninstall pg gem install pg

用户手册详细介绍了这个主题。您可以:

pg_upgrade就地;或 Pg_dump和pg_restore。

如果有疑问，请使用转储。不要删除旧的数据目录，保留下来，以防出现问题/你犯了错误;这样，您就可以返回到未更改的9.3安装。

具体操作请参见产品手册。

如果你被卡住了，发一个详细的问题，解释你是如何被卡住的，在哪里，你首先尝试了什么。这也取决于你如何安装PostgreSQL，因为在OS X上有几个不同的PostgreSQL“发行版”(不幸的是)。所以你需要提供这些信息。

我认为这是您将postgres更新到9.6的解决方案的最佳链接

https://sandymadaan.wordpress.com/2017/02/21/upgrade-postgresql9-3-9-6-in-ubuntu-retaining-the-databases/

假设您已经使用自制程序安装和升级Postgres，您可以执行以下步骤。

Stop current Postgres server: launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist Initialize a new 10.1 database: initdb /usr/local/var/postgres10.1 -E utf8 run pg_upgrade (note: change bin version if you're upgrading from something other than below): pg_upgrade -v \ -d /usr/local/var/postgres \ -D /usr/local/var/postgres10.1 \ -b /usr/local/Cellar/postgresql/9.6.5/bin/ \ -B /usr/local/Cellar/postgresql/10.1/bin/ -v to enable verbose internal logging -d the old database cluster configuration directory -D the new database cluster configuration directory -b the old PostgreSQL executable directory -B the new PostgreSQL executable directory Move new data into place: cd /usr/local/var mv postgres postgres9.6 mv postgres10.1 postgres Restart Postgres: launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist Check /usr/local/var/postgres/server.log for details and to make sure the new server started properly. Finally, re-install the rails pg gem gem uninstall pg gem install pg

我建议你花点时间阅读PostgreSQL文档，了解你在上述步骤中所做的事情，以减少挫折。

看来Homebrew现在已经有了解决方案:

$ brew info postgresql
...
==> Caveats
To migrate existing data from a previous major version of PostgreSQL run:
  brew postgresql-upgrade-database
....