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These scripts can be used to figure out how often different sets of column combinations are used to filter queries in PostgreSQL. It's most useful for getting a high-level view in order to design and refactor indexes (e.g. if a certain set of columns is rarely used to filter queries, it's possible using index-merging instead of composite indexes would improve overall performance).

Usage

• For each server in your database cluster, using credentials that can read pg_stat_statements.queryid (which is usually just superusers), download the contents of pg_stat_statements as CSV. This should be done separately for the primary and the replicas because pg_stat_statements tracks queries locally:

psql --csv -c 'SELECT * FROM pg_stat_statements' $DATABASE_URL > pg_stat_statements/$DATABASE_NAME.csv

systemist

class Example
  define_method(:call) do
    yield if block_given?
  end
end

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-- http://www.hammerspoon.org/docs/hs.hotkey.html

local function keyCode(key, modifiers)
  modifiers = modifiers or {}

  return function()
      hs.eventtap.event.newKeyEvent(modifiers, string.lower(key), true):post()
      hs.timer.usleep(1000)
      hs.eventtap.event.newKeyEvent(modifiers, string.lower(key), false):post()
  end

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RSpec.describe "Using a table for multiple examples" do
  def self.define_data_table(name, table_doc)
    fields, *records = *table_doc.lines.map { |l| l.split('|').map(&:strip).reject(&:empty?) }
    define_singleton_method(name) { records.map { |r| Hash[fields.map(&:to_sym).zip(r)] } }
  end

  define_data_table(:users, <<~USERS)
    | name   | email              | twitter         |
    | Aslak  | aslak@cucumber.io  | @aslak_hellesoy |
    | Julien | julien@cucumber.io | @jbpros         |

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1.1 Notes

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1.1 Assignments

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#!/bin/sh

# Check for Homebrew,
# Install if we don't have it
if test ! $(which brew); then
  echo "Installing homebrew..."
  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
fi

echo "Setting up XCode"

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import Ember from 'ember';

export default Ember.Route.extend({
  'things-store': Ember.inject.service('things-store'),
  model() {
    console.log('model', this.get('things-store.things').length);
    this.get('things-store').fetch();
    console.log('post', this.get('things-store.things').length);
    return this.get('things-store');
  },

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Account

{
  "name": "Account Name",
  "starting_balance": 354745, // Number in pennies
  "starting_balance_date": "2015-03-15",

  "current_balance": 269439 // Number in pennies
  "current_balance_date": "2015-07-03",

systemist

import ForecastCollection from './models';

let forecasts = new ForecastCollection();

var Store = _.extend({}, Backbone.Events, {
  initialize() {
    this.listenTo(forecasts, 'add remove change', () => this.trigger('change'));
  },

  getForecasts() {