在 mac 下，可以利用 homebrew 直接安装 PostgreSQL：
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brew install postgresql -v
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稍等片刻，PostgreSQL 就安装完成。接下来就是初始数据库，在终端执行一下命令，初始配置 PostgreSQL：
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initdb /usr/local/var/postgres -E utf8
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上面指定 "/usr/local/var/postgres" 为 PostgreSQL 的配置数据存放目录，并且设置数据库数据编码是 utf8，更多配置信息可以 "initdb --help" 查看。
设成开机启动 PostgreSQL：
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ln -sfv /usr/local/opt/postgresql/*.plist ~/Library/LaunchAgents
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
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启动 PostgreSQL：
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pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start
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关闭 PostgreSQL：
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pg_ctl -D /usr/local/var/postgres stop -s -m fast
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创建一个 PostgreSQL 用户
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createuser username -P#Enter password for new role:#Enter it again: |
上面的 username 是用户名，回车输入 2 次用户密码后即用户创建完成。更多用户创建信息可以 "createuser --help" 查看。
创建数据库
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createdb dbname -O username -E UTF8 -e |
上面创建了一个名为 dbname 的数据库，并指定 username 为改数据库的拥有者（owner），数据库的编码（encoding）是 UTF8，参数 "-e" 是指把数据库执行操作的命令显示出来。
更多数据库创建信息可以 "createdb --help" 查看。
连接数据库
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psql -U username -d dbname -h 127.0.0.1 |
WARNING: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.
Success. You can now start the database server using:
/usr/local/Cellar/postgresql/9.5.1/bin/pg_ctl -D /usr/local/var/postgres -l logfile start
==> Caveats
If builds of PostgreSQL 9 are failing and you have version 8.x installed,
you may need to remove the previous version first. See:
https://github.com/Homebrew/homebrew/issues/2510
To migrate existing data from a previous major version (pre-9.0) of PostgreSQL, see:
http://www.postgresql.org/docs/9.5/static/upgrading.html
To migrate existing data from a previous minor version (9.0-9.4) of PosgresSQL, see:
http://www.postgresql.org/docs/9.5/static/pgupgrade.html
You will need your previous PostgreSQL installation from brew to perform `pg_upgrade`.
Do not run `brew cleanup postgresql` until you have performed the migration.
To have launchd start postgresql at login:
ln -sfv /usr/local/opt/postgresql/*.plist ~/Library/LaunchAgents
Then to load postgresql now:
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
Or, if you don't want/need launchctl, you can just run:
postgres -D /usr/local/var/postgres
==> Summary