cpursley

PostgreSQL is Enough

• Simplify: move code into database functions
• Just Use Postgres for Everything
• PostgreSQL is the worlds’ best database
• Postgres is eating the database world
• Hacker News discussion

Background and Cron Jobs

warhammerkid

require 'bigdecimal'
require 'json'
require 'mqtt'
require 'prometheus_exporter'
require 'prometheus_exporter/server'

class MetricsServer
  def initialize(broker)
    @broker = broker

hartleybrody

Postgres is usually run automatically on my laptop. I also have a weekly cronjob that does brew update and brew upgrade which sometimes bumps the version of portgres that I'm running. Newer versions of the postgres server software aren't necessarily compatible with the older version's data directory structure, and so you need to "upgrade" your database to see all of your old data in the upgraded postgres server.

Trying to start the database manually with

pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start

Which gives an error message and tells me where to look (note that I passed in the log directory when I ran the command)

waiting for server to start.... stopped waiting

pg_ctl: could not start server

JoshKaufman

var sendString = (function(rfb, force, sendDelay) { 
  sendDelay = sendDelay || 25;
  var _q = [];
  var _qStart = function() {
    var chr = _q.shift();
    if (chr) {
      rfb.sendKey(chr);
      setTimeout(_qStart, sendDelay);
    }
  };

magicznyleszek

Jekyll & Liquid Cheatsheet

A list of the most common functionalities in Jekyll (Liquid). You can use Jekyll with GitHub Pages, just make sure you are using the proper version.

Running

Running a local server for testing purposes:

adamlj

requests.post("https://api.mailgun.net/v2/DOMAIN/messages",
              auth=("api", "key-SECRET"),
              files={
                  "attachment[0]": ("FileName1.ext", open(FILE_PATH_1, 'rb')),
                  "attachment[1]": ("FileName2.ext", open(FILE_PATH_2, 'rb'))
              },
              data={"from": "FROM_EMAIL",
                    "to": [TO_EMAIL],
                    "subject": SUBJECT,
                    "html": HTML_CONTENT

willurd

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

rgreenjr

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

mshafrir

{
    "AL": "Alabama",
    "AK": "Alaska",
    "AS": "American Samoa",
    "AZ": "Arizona",
    "AR": "Arkansas",
    "CA": "California",
    "CO": "Colorado",
    "CT": "Connecticut",
    "DE": "Delaware",