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Types of index scans

Indexes

Sequential Scan:

• Read every row in the table
• No reading of index. Reading from indexes is also expensive.

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Helm cheatsheet

• Helm cheatsheet
  • Get started
  • Struture
  • General Usage
  • Template
  • Hooks

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defmodule MyAppAPI.ReleaseTasks do
  alias Ecto.Migrator

  @otp_app :myapp_api
  @start_apps [:logger, :ssl, :postgrex, :ecto]

  def migrate do
    init(@otp_app, @start_apps)

    run_migrations_for(@otp_app)

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The standard names for indexes in PostgreSQL are:

{tablename}_{columnname(s)}_{suffix}

where the suffix is one of the following:

• pkey for a Primary Key constraint;
• key for a Unique constraint;
• excl for an Exclusion constraint;
• idx for any other kind of index;

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Preperation

Installation

• Install Elixir: http://elixir-lang.org/install.html
• Install Phoenix http://www.phoenixframework.org/docs/installation

sudo apt-get install inotify-tools #ubuntu
sudo apt-get install postgresql #Ubuntu

mix local.hex #install hex
mix archive.install https://github.com/phoenixframework/archives/raw/master/phoenix_new.ez #phoenix archive

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use Mix.Config

# We don't run a server during test. If one is required,
# you can enable the server option below.
config :hello_phoenix, HelloPhoenix.Endpoint,
  http: [port: 4001],
  server: false

# Print only warnings and errors during test
config :logger, level: :warn

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Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

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Name: Flash 
Serial: eNrzzU/OLi0odswsqnHLSSzOqDGoca7JKCkpsNLXLy8v1ytJTczVLUotKNFLzs8FAJHYETc=

if anyone wants to thank ETH: 0x527c2aB55b744D6167dc981576318af96ed26676
Thank you!

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Введение

Начать стоит отсюда. Не пугайтесь то, что это книга по незнакомой OS, эти термины практически везде одинаковые и здесь они изложены в понятной для начинающих форме.

http://www.qnx.com/developers/docs/6.4.1/neutrino/getting_started/s1_procs.html

Прочесть нужно треть главы до подраздела "Starting a process", если С не пугает, читайте полностью. После прочтения вы будете понимать, что такое process, thread, mutex, priorites, semaphores, scheduler, contex-switch, kernel states.

Ruby

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This runs a build for a small elixir (phoenix) project in about 40 seconds by caching as much of the compiled files as possible.

We've been using this for months in multiple projects without any issues. Please ping be if there is any issues with this script and I'll update it.

It should be generic enough to work on any elixir app using mix.

If you have a elixir_buildpack.config, then enable that section in the build script to keep versions in sync!