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Datomic - Lidando com dados de maneira versionada

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Palestra que o Rodrigo Flores e eu apresentamos no TDC 2015 na trilha NoSQL. Nesta palestra apresentamos uma introdução básica ao banco de Dados Datomic, e porque ele é ótimo para nossas necessidades no Nubank.

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Datomic - Lidando com dados de maneira versionada

  1. 1. Datomic Lidando com dados de maneira versionada
  2. 2. Rodrigo Flores @rlmflores rodrigo.flores@nubank.com.br
  3. 3. Luiz Hespanha @luiz_hespanha luiz.hespanha@nubank.com.br
  4. 4. Datomic Arquitetura ACID Funções
  5. 5. Dados em uma estrutura financeira
  6. 6. Datomic
  7. 7. Banco Orientado a Fatos
  8. 8. ID Nome Telefone Celular Telefone Fixo 1 John Doe 11 5555 5555 11 5556 5556 2 Mark Doe 11 5555 5556 NULL 3 Jane Doe 11 5555 6666 NULL
  9. 9. Modelo Entidade-Atributo-Valor (EAV)
  10. 10. ID Atributo Valor 1 Nome John Doe 1 Telefone Celular 11 5555 5555 1 Telefone Fixo 11 5556 5556 2 Nome Mark Doe 2 Telefone Celular 11 5555 5556 3 Nome Jane Doe 3 Telefone Celular 11 5555 6666
  11. 11. Modelo EAVT - Datomic
  12. 12. ID Atributo Valor Transação 1 Nome John Doe 12 1 Telefone Celular 11 5555 5555 12 1 Telefone Fixo 11 5556 5556 13 2 Nome Mary Poppins 25 2 Telefone Celular 11 5555 5556 67 2 Recomendado por 1 128 3 Nome Jane Doe 222 3 Telefone Celular 11 5555 6666 223
  13. 13. Fatos podem deixar de ser fatos
  14. 14. ID Atributo Valor Transação 1 Telefone Fixo 11 5555 5555 12 1 Telefone Fixo 11 5555 5555 55
  15. 15. É possível sobrescrever um fato
  16. 16. ID Atributo Valor Transação 1 Nome Jane Doe 25 1 Nome Jane Doe 98 1 Nome Jane Mary Doe 98
  17. 17. Mas isso é uma sobrescrita
  18. 18. Transações do banco de dados são entidades
  19. 19. ID Atributo Valor Transação 1 Nome John Doe 12 1 Telefone Celular 11 5555 5555 12 1 Telefone Fixo 11 5556 5556 13 2 Nome Mary Poppins 25 2 Telefone Celular 11 5555 5556 67 3 Nome Jane Doe 72 3 Telefone Celular 11 5555 6666 99
  20. 20. ID Atributo Valor 12 Hora 2012-09-12T00:00:00Z 13 Hora 2012-09-12T00:00:05Z 25 Hora 2012-09-22T00:00:00Z
  21. 21. Qualquer informação relevante pode ser adicionada na transação
  22. 22. ID Atributo Valor 12 Hora 2012-09-12T00:00:00Z 12 Usuário Joaquim José 13 Hora 2012-09-12T00:00:05Z 13 Usuário Maria Augusta
  23. 23. Arquivos em um controle de versão Arquivos em uma pasta vs
  24. 24. Queries
  25. 25. Programação Lógica
  26. 26. [[?entidade :atributo1 ?valor1]]

  27. 27. {:find [?celular]
 :in [?nome]
 :where [[?pessoa :pessoa/nome ?nome]
 [?pessoa :pessoa/telefone-celular ? celular]]}

  28. 28. {:find [?nome]
 :where [[?pessoa :pessoa/nome ?nome]
 [?pessoa :pessoa/idade ?idade]
 [(> ?idade 35)]]}
  29. 29. Schema
  30. 30. Todo atributo tem um tipo
  31. 31. Integer String Long Boolean Double UUID Big Int Ref Big Dec Instant Float
  32. 32. Sempre não nulo Não há obrigatoriedade de campo
  33. 33. Viajando no tempo
  34. 34. Default
  35. 35. ID Atributo Valor Hora da Transação 1 Nome Jane Doe 25/03/2015 10:00:12Z 1 CPF 11111111111 25/03/2015 10:00:12Z 1 Telefone 11 5555 5555 25/03/2015 10:00:12Z 1 Nome Jane Doe 12/04/2015 15:02:27Z 1 Nome Jane Mary Doe 12/04/2015 15:02:27Z
  36. 36. As Of
  37. 37. ID Atributo Valor Hora da Transação 1 Nome Jane Doe 25/03/2015 10:00:12Z 1 CPF 11111111111 25/03/2015 10:00:12Z 1 Telefone 11 5555 5555 25/03/2015 10:00:12Z 1 Nome Jane Doe 12/04/2015 15:02:27Z 1 Nome Jane Mary Doe 12/04/2015 15:02:27Z
  38. 38. Qual era o telefone da cliente cujo CPF é “11111111111” no instante 2015-05-08T01:12:00Z ?
  39. 39. ID Atributo Valor Hora da Transação 1 Nome Jane Doe 25/03/2015 10:00:12Z 1 CPF 11111111111 25/03/2015 10:00:12Z 1 Telefone 11 5555 5555 25/03/2015 10:00:12Z 1 Nome Jane Doe 12/04/2015 15:02:27Z 1 Nome Jane Mary Doe 12/04/2015 15:02:27Z
  40. 40. Qual o nome do cliente cujo CPF é “11111111111” no instante 2015-04-01T01:12:00Z ?
  41. 41. ID Atributo Valor Hora da Transação 1 Nome Jane Doe 25/03/2015 10:00:12Z 1 CPF 11111111111 25/03/2015 10:00:12Z 1 Telefone 11 5555 5555 25/03/2015 10:00:12Z 1 Nome Jane Doe 12/04/2015 15:02:27Z 1 Nome Jane Mary Doe 12/04/2015 15:02:27Z
  42. 42. Since
  43. 43. ID Atributo Valor Hora da Transação 1 Nome Jane Doe 25/03/2015 10:00:12Z 1 CPF 11111111111 25/03/2015 10:00:12Z 1 Telefone 11 5555 5555 25/03/2015 10:00:12Z 1 Nome Jane Doe 12/04/2015 15:02:27Z 1 Nome Jane Mary Doe 12/04/2015 15:02:27Z
  44. 44. Quais foram os clientes que mudaram de nome após dia 01/04 ?
  45. 45. ID Atributo Valor Hora da Transação 1 Nome Jane Doe 25/03/2015 10:00:12Z 1 CPF 11111111111 25/03/2015 10:00:12Z 1 Telefone 11 5555 5555 25/03/2015 10:00:12Z 1 Nome Jane Doe 12/04/2015 15:02:27Z 1 Nome Jane Mary Doe 12/04/2015 15:02:27Z
  46. 46. History
  47. 47. ID Atributo Valor Hora da Transação 1 Nome Jane Doe 25/03/2015 10:00:12Z 1 CPF 11111111111 25/03/2015 10:00:12Z 1 Telefone 11 5555 5555 25/03/2015 10:00:12Z 1 Nome Jane Doe 12/04/2015 15:02:27Z 1 Nome Jane Mary Doe 12/04/2015 15:02:27Z
  48. 48. Qual foram todos os nomes utilizados pelo cliente cujo CPF é 11111111111 ?
  49. 49. ID Atributo Valor Hora da Transação 1 Nome Jane Doe 25/03/2015 10:00:12Z 1 CPF 11111111111 25/03/2015 10:00:12Z 1 Telefone 11 5555 5555 25/03/2015 10:00:12Z 1 Nome Jane Doe 12/04/2015 15:02:27Z 1 Nome Jane Mary Doe 12/04/2015 15:02:27Z
  50. 50. Qual era o nome do cliente cujo nome hoje é Jane Mary Doe no dia 01/04/2015 ?
  51. 51. Múltiplos bancos
  52. 52. (d/query {:find [?as-of-nome]
 :in [$current-db $as-of-db]
 :where [[$current-db ?pessoa :pessoa/ nome "Jane Mary Doe"]
 [$old-db ?pessoa :pessoa/nome ? as-of-nome]]}
 (d/db connection)
 (d/as-of #inst "2015-04-01T00:00:00Z"))
  53. 53. Banco orientado a fatos
  54. 54. Fatos não são “apagados” ou alterados: escrevemos novos valores como novas “versões" de fatos antigos
  55. 55. Pode-se buscar no banco com uma data específica, com fatos inseridos a partir de uma certa data, ou em todo o histórico
  56. 56. Pode-se utilizar mais de um banco em uma query;
  57. 57. Arquitetura Imagem retirada de http://docs.datomic.com/architecture.html
  58. 58. Serviço de "storage"
  59. 59. Peers
  60. 60. Processo que manipula o banco usando a biblioteca “Datomi Peer"
  61. 61. API para Clojure e Java
  62. 62. Cada Peer possui um cache com o serviço de Storage
  63. 63. Qualquer processo pode ser um Peer • Web Server • Aplicação GUI • Aplicação de linha de comando
  64. 64. Mas eu não uso uma linguagem JVM-Hosted, e agora?
  65. 65. REST API Um PEER pode ser iniciado como um serviço HTTP standalone.
  66. 66. Transactor
  67. 67. Responsável por toda escrita no banco de dados
  68. 68. Notifica todos os PEERS sobre novos fatos.
  69. 69. E quando o Datomic não é uma boa escolha ?
  70. 70. ACID
  71. 71. Atômico
  72. 72. Transação
  73. 73. Ou faz tudo, ou aborta
  74. 74. Consistente
  75. 75. Validação de tipos e NULL
  76. 76. Transações só são vistas por completo
  77. 77. Isolamento
  78. 78. Uma escrita por vez
  79. 79. Durável
  80. 80. Só dá o OK depois de escrever no storage
  81. 81. ACID
  82. 82. Funções com regras de negócio
  83. 83. Funções a nível de transação.
  84. 84. Escopo limitado / Banco filtrado
  85. 85. Excision - Apagar dados de maneira definitiva
  86. 86. Conclusão
  87. 87. Dados são importantes
  88. 88. Auditoria de informação
  89. 89. Bancos históricos
  90. 90. Facilidade de deploy
  91. 91. OBRIGADO! Estamos contratando! http://bit.ly/trabalhe-na-nubank

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