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。

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

这对我很有用。

https://gist.github.com/dideler/60c9ce184198666e5ab4

言简意赅。老实说，我的目标不是理解PostgreSQL的精髓，我只想把事情做好。

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
....

在Windows上，当尝试使用pg_upgrade时，我一直面临不同的错误消息。

为我节省了很多时间

备份数据库 卸载PostgreSQL的所有副本 安装9.5 恢复数据库

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。