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Migración de Oracle a PostgreSQL

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Estrategias de Modernización OpenSource
Casos prácticos en servicios de migración
Benito Cuesta
Junio 2014

Published in: Software
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  • DOWNLOAD THAT BOOKS INTO AVAILABLE FORMAT (2019 Update) ......................................................................................................................... ......................................................................................................................... Download Full PDF EBOOK here { http://bit.ly/2m6jJ5M } ......................................................................................................................... Download Full EPUB Ebook here { http://bit.ly/2m6jJ5M } ......................................................................................................................... Download Full doc Ebook here { http://bit.ly/2m6jJ5M } ......................................................................................................................... Download PDF EBOOK here { http://bit.ly/2m6jJ5M } ......................................................................................................................... Download EPUB Ebook here { http://bit.ly/2m6jJ5M } ......................................................................................................................... Download doc Ebook here { http://bit.ly/2m6jJ5M } ......................................................................................................................... ......................................................................................................................... ................................................................................................................................... eBook is an electronic version of a traditional print book that can be read by using a personal computer or by using an eBook reader. (An eBook reader can be a software application for use on a computer such as Microsoft's free Reader application, or a book-sized computer that is used solely as a reading device such as Nuvomedia's Rocket eBook.) Users can purchase an eBook on diskette or CD, but the most popular method of getting an eBook is to purchase a downloadable file of the eBook (or other reading material) from a Web site (such as Barnes and Noble) to be read from the user's computer or reading device. Generally, an eBook can be downloaded in five minutes or less ......................................................................................................................... .............. Browse by Genre Available eBooks .............................................................................................................................. Art, Biography, Business, Chick Lit, Children's, Christian, Classics, Comics, Contemporary, Cookbooks, Manga, Memoir, Music, Mystery, Non Fiction, Paranormal, Philosophy, Poetry, Psychology, Religion, Romance, Science, Science Fiction, Self Help, Suspense, Spirituality, Sports, Thriller, Travel, Young Adult, Crime, Ebooks, Fantasy, Fiction, Graphic Novels, Historical Fiction, History, Horror, Humor And Comedy, ......................................................................................................................... ......................................................................................................................... .....BEST SELLER FOR EBOOK RECOMMEND............................................................. ......................................................................................................................... Blowout: Corrupted Democracy, Rogue State Russia, and the Richest, Most Destructive Industry on Earth,-- The Ride of a Lifetime: Lessons Learned from 15 Years as CEO of the Walt Disney Company,-- Call Sign Chaos: Learning to Lead,-- StrengthsFinder 2.0,-- Stillness Is the Key,-- She Said: Breaking the Sexual Harassment Story That Helped Ignite a Movement,-- Atomic Habits: An Easy & Proven Way to Build Good Habits & Break Bad Ones,-- Everything Is Figureoutable,-- What It Takes: Lessons in the Pursuit of Excellence,-- Rich Dad Poor Dad: What the Rich Teach Their Kids About Money That the Poor and Middle Class Do Not!,-- The Total Money Makeover: Classic Edition: A Proven Plan for Financial Fitness,-- Shut Up and Listen!: Hard Business Truths that Will Help You Succeed, ......................................................................................................................... .........................................................................................................................
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Migración de Oracle a PostgreSQL

  1. 1. Casos prácticos en servicios de migración Migración de Oracle a PostgreSQL Benito Cuesta Junio 2014
  2. 2. • Objetivos • Escenario • Proyectos de migración • Compatibilidad Oracle • Estrategias de Migración • Migración • Herramientas (Ora2Pg) • Caso práctico Contenido 27/06/14 Copyright (c) Open Canarias, 2014 2
  3. 3. • Conocer la metodología para abordar proyectos de migración de bbdd Oracle a PG de forma sistemática. • Conocer las herramientas existentes que facilitan la migración. • Conocer los problemas de dichas herramientas y que requieren de intervención manual. Objetivos 27/06/14 Copyright (c) Open Canarias, 2014 3
  4. 4. • Migración del SGBD Oracle a la plataforma Enterprise DB Advanced Server – Migración de objetos – Migración de lógica de negocio (PL/SQL a PLpgSQL) Escenario 27/06/14 Copyright (c) Open Canarias, 2014 4
  5. 5. • ¿Qué es EnterpriseDB? PostgreSQL / EnterpriseDB 27/06/14 Copyright (c) Open Canarias, 2014 5
  6. 6. ¿Porqué Postgres? 27/06/14 Copyright (c) Open Canarias, 2014 6
  7. 7. • Lógica de Negocio fuera del SGBD. • Funcionalidad aportada por otros productos Oracle (GoldenGate, Reports, …) • Productos de terceros que necesitan Oracle. ¿Qué NO solucionamos con PostgreSQL? 27/06/14 Copyright (c) Open Canarias, 2014 7
  8. 8. • Pasos de un proyecto de migración – Obtención de datos del sistema actual. – Elaboración de assessment, oferta y plan de proyecto. – Preparación de los diferentes entornos (infraestructura) – Migración de objetos – Migración de datos – Migración de código – Adaptación de las aplicaciones – Pruebas – Corrección de defectos Proyectos de migración 27/06/14 Copyright (c) Open Canarias, 2014 8
  9. 9. – Obtener medidas para definir la estrategia • Cuantificación de objetos • Identificación del uso de constraints • Especificidades (tipos de datos de usuario, campos tipo blob, tablas particionadas, …) • Cuantificación de LOC • Uso de características específicas (Spatial, XML, Text Search, …) – Entender la arquitectura de la base de datos y su configuración • Infraestructura actual (versiones, hardware, cpu, almacenamiento) • Profiling (usuarios/día, transacciones/día) • Índice de crecimiento del almacenamiento • Configuración de alta disponibilidad (SLAs) • Políticas y herramientas de backup • Plataforma de aplicación Obtención de datos del sistema actual 27/06/14 Copyright (c) Open Canarias, 2014 9
  10. 10. • Introducción • Datos obtenidos Perfil de BBDD/Aplicación • Factores de compatibilidad (Object parameters, características, sintaxis del código, paquetes, implementación) • Mapa de Compatibilidad Elaboración de Assessment (I) 27/06/14 Copyright (c) Open Canarias, 2014 10
  11. 11. • Estimación del tiempo según Enterprise DB – Score 7 – 10 : 2 – 4 semanas – Score 4 -7 : 4 – 8 semanas – Score 0 – 4 : características no soportadas, riesgo de pérdida de funcionalidad, estimación en tiempo dependiendo de los problemas encontrados. • Estimación en PoC (sólo PL/SQL): 1,5 d por 10000 LOC Elaboración de Assessment (II) 27/06/14 Copyright (c) Open Canarias, 2014 11
  12. 12. • Ejemplo de cuadro de costes con Oracle • Ejemplo de cuadro de costes con PostgreSQL Realización de Assessment (III) 27/06/14 Copyright (c) Open Canarias, 2014 12
  13. 13. • Oracle Compatibility Developers’s Guide (¡680 páginas!) – Parámetros de configuración compatibles (edb_redwood_date, edb_redwood_strings, oracle_home,…) – Tipos de datos compatibles – Funciones de sistema compatibles – Vistas de sistema compatibles – Lenguaje compatible Compatibilidad Oracle (I) 27/06/14 Copyright (c) Open Canarias, 2014 13
  14. 14. • Ejecutar aplicaciones escritas para Oracle sin necesidad de cambiarlas. • Soporte para paquetes, procedimientos almacenados, triggers y mucho más • Soporte para OCI, PRO*C • Sin dependencia de un proveedor Compatibilidad Oracle (II) 27/06/14 Copyright (c) Open Canarias, 2014 14
  15. 15. • Soporte a SQL extendido – Decode, NVL, Substr, NVL2 – Date/time functions: add_month, extract, next_day • Soporte PL/SQL – REF Cursors – Looping – Cursores implícitos y explícitos – Declaración de variables – Sentencias condicionales – Arrays Associativos (INDEX BY) • Herramientas – EDB*Plus – equivalente a SQL*Plus – EDB*Loader – equivalente a SQL*Loader • Características – Procedimientos almacenados – Paquetes – Hints Compatibilidad Oracle (III) 27/06/14 Copyright (c) Open Canarias, 2014 15
  16. 16. • Características (cont) – Database links – Consultas jerárquicas – Sinónimos – Rownum – Tipos de datos – Control explícito de transacción • No soportado en el interior de un procedimiento almacenado. – Tipos objetos • Create type … as object • Create type … as table • Object methods – Bulk Binding / Fetch – Usuarios / Roles – SQL Dinámico Compatibilidad Oracle (IV) 27/06/14 Copyright (c) Open Canarias, 2014 16
  17. 17. • Paquetes incluidos Compatibilidad Oracle (V) 27/06/14 Copyright (c) Open Canarias, 2014 17
  18. 18. • Diccionario de datos equivalente – Vistas ALL_, DBA_, USER_ • Diagnóstico – DRITA (Dynamic Runtime Instrumentation Tools Architecture) – System and session waits • No expuestos en PostgreSQL • Parte de Advanced Server – Statspack como reporting Compatibilidad Oracle (y VI) 27/06/14 Copyright (c) Open Canarias, 2014 18
  19. 19. Estrategia Beneficios Desarrollo / Despliegue Aplicaciones nuevas • Significativo ahorro de costes para sistemas no-críticos • Bajo Riesgo Despliegue de Postgres Plus como un Oracle Replication Server • Significativo ahorro de costes • Aprovecha Postgres Plus RS • Mejora rendimiento de consultas y transacciones. Migrar aplicaciones Oracle no críticas a Postgres • Significativo ahorro de costes • Bajo riesgo Migrar aplicaciones de misión crítica a Postgres • Ahorro de costes muy significativos • Mayor flexibilidad de implementación. Estrategias de migración 27/06/14 Copyright (c) Open Canarias, 2014 19
  20. 20. Recursos de EnterpriseDB • Compatibilidad con Oracle [video] • Estrategias de contención de coste • Oracle Compatibility Developers’s Guide • Oracle Migration Tutorial • Ejemplo de Assessment. http://www.enterprisedb.com/solutions/oracle-compatibilit 27/06/14 Copyright (c) Open Canarias, 2014 20
  21. 21. • Migración de esquemas – Crear usuarios y esquemas con el mismo nombre (search_path) • Identificadores – Ojo con los nombres de los esquemas, tablas, columnas, funciones,… – Limitar el uso de comillas en los identificadores (posible problemas en las aplicaciones) Migración de esquema. Consideraciones (I) 27/06/14 Copyright (c) Open Canarias, 2014 21
  22. 22. • Tablas – CREATE TABLE compatible, excepto • Tablas temporales globales Usar LOCAL TEMP – Clausulas de particionamiento – Clasulas de almacenamiento INITTRANS, MAXEXTENTS Eliminarlas – PCTFREE : Usar fillfactor • Columnas – Columnas virtuales Usar vistas – Tipos de datos Migración de esquema. Consideraciones (II) 27/06/14 Copyright (c) Open Canarias, 2014 22
  23. 23. • Constraints – Primary Key, Foraign Key, Unique, CHECK, NOT NULL  OK • Índices – Btree / Descending  OK – Reverse Key / Bitmap / Bitmap Join  No implementado – Índices Globales  No soportado • Particiones – Hash, List, Range  OK (implementado con table inheritance y rules) • Tablespaces – No es lo mismo que en Oracle, pero tienen el mismo propósito. Migración de esquema. Consideraciones (III) 27/06/14 Copyright (c) Open Canarias, 2014 23
  24. 24. • Transformación de código a código debido a la similitud entre lenguajes. • No hay extracción de arquitectura ni de conocimiento del sistema. • Cuando el gap entre lenguajes es más amplio, se han de usar otro tipo de técnicas. Migración de código 27/06/14 Copyright (c) Open Canarias, 2014 24
  25. 25. • Las migraciones de Oracle a Postgres son posibles! • Las migraciones 100% automáticas no son posibles (o sólo en casos muy simples) • No hay milagros  Es necesario reescribir código • Herramientas: – EDB Migration Toolkit (MTK) – Ora2Pg – ETL (para grandes volúmenes de datos, campos blob,...) Posibilidades 27/06/14 Copyright (c) Open Canarias, 2014 25
  26. 26. • Reescribe código de PL/SQL a PlpgSQL. • Reemplaza expresiones. • Elimina código sobrante. ¿Qué hace Ora2Pg con el código PL/SQL? 27/06/14 Copyright (c) Open Canarias, 2014 26
  27. 27. • Problemas de encoding. – Cambiar el encoding en los ficheros SQL SET client_encoding TO ‘ISO-8859-1’; • Nomenclatura de objetos. Objetos con nombres con espacios, vocales acentuadas y caracteres especiales. • Usar comillas dobles en el nombre de los objetos. • Expresiones regulares de Ora2Pg no son perfectas. Dificultades habituales 27/06/14 Copyright (c) Open Canarias, 2014 27
  28. 28. CasoPráctico
  29. 29. Escenario Demo 27/06/14 Copyright (c) Open Canarias, 2014 29 Oracle 11g PostgreSQL 9.3 Centos 6.5 JDBC Export Schema Code Dataora2pg java8 Create DB User pg psql JDBC
  30. 30. Gracias

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