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我最近遇到了一个问题，Rails 正在断开与我的 PostgreSQL 的连接，导致每个请求多次重新连接，从而显着降低了请求速度。我目前正在使用以下环境在 Mac OS X 上本地运行所有内容：

  • Mac OS X 10.8（山狮）
  • 战俘
  • NginX (ssl unwrapping - 相同的应用程序重新连接行为即使没有启用此功能)
  • PostgreSQL 9.2.2 通过 Homebrew
  • 导轨 3.2.11

这是我的database.yml：（数据库和用户名已编辑）

development:
  adapter: postgresql
  encoding: unicode
  database: <database>
  pool: 5
  username: <user>
  password:

development.log这是典型请求期间的输出：（特定模型和渲染已编辑）

Connecting to database specified by database.yml


Started GET "/" for 127.0.0.1 at 2013-02-05 12:25:38 -0800
Processing by HomeController#index as HTML
  ... <app performs model loads and render calls>
Completed 200 OK in 314ms (Views: 196.0ms | ActiveRecord: 60.9ms)
Connecting to database specified by database.yml
Connecting to database specified by database.yml

我还在 Postgres 中启用了语句日志记录，以便更好地了解在给定请求期间数据库端到底发生了什么。这是来自的输出postgresql-<date>.log：（特定于我的应用程序的查询已编辑）

LOG:  connection received: host=[local]
LOG:  connection authorized: user=<user> database=<database>
LOG:  statement: set client_encoding to 'UTF8'
LOG:  statement: set client_encoding to 'unicode'
LOG:  statement: SHOW client_min_messages
LOG:  statement: SET client_min_messages TO 'panic'
LOG:  statement: SET standard_conforming_strings = on
LOG:  statement: SET client_min_messages TO 'notice'
LOG:  statement: SET time zone 'UTC'
LOG:  statement: SHOW TIME ZONE
LOG:  statement: SELECT 1
LOG:  statement: SELECT 1
    ... <app makes queries for request>
LOG:  disconnection: session time: 0:00:01.346 user=<user> database=<database> host=[local]
LOG:  connection received: host=[local]
LOG:  connection authorized: user=<user> database=<database>
LOG:  statement: set client_encoding to 'UTF8'
LOG:  statement: set client_encoding to 'unicode'
LOG:  statement: SHOW client_min_messages
LOG:  statement: SET client_min_messages TO 'panic'
LOG:  statement: SET standard_conforming_strings = on
LOG:  statement: SET client_min_messages TO 'notice'
LOG:  statement: SET time zone 'UTC'
LOG:  statement: SHOW TIME ZONE
LOG:  statement: SELECT 1
LOG:  connection received: host=[local]
LOG:  connection authorized: user=<user> database=<database>
LOG:  statement: set client_encoding to 'UTF8'
LOG:  statement: set client_encoding to 'unicode'
LOG:  statement: SHOW client_min_messages
LOG:  statement: SET client_min_messages TO 'panic'
LOG:  statement: SET standard_conforming_strings = on
LOG:  statement: SET client_min_messages TO 'notice'
LOG:  statement: SET time zone 'UTC'
LOG:  statement: SHOW TIME ZONE
LOG:  statement: SELECT 1
LOG:  statement: SELECT 1
LOG:  statement: SELECT 1
LOG:  disconnection: session time: 0:00:00.750 user=<user> database=<database> host=[local]
LOG:  disconnection: session time: 0:00:00.733 user=<user> database=<database> host=[local]

我很高兴更新相关配置或命令调用的日志输出。另外，为什么所有的SELECT 1电话？他们的目的是什么？

谢谢！

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1 回答 1

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答案是将 PostgreSQL 升级到更新的版本。我刚刚升级到原始问题中使用的9.2.4from9.2.2并且问题完全消失了，预期的性能特征返回到我的开发应用程序。

于 2013-05-05T09:11:42.873 回答