September 2024
Intermediate to advanced
514 pages
13h 29m
Spanish
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Capítulo 5. Índices
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Este capítulo presenta los índices de MongoDB. Los índices te permiten realizar consultas de forma eficiente. Son una parte importante del desarrollo de aplicaciones e incluso son necesarios para ciertos tipos de consultas. En este capítulo cubriremos:
Qué son los índices y por qué querrías utilizarlos
Cómo elegir qué campos indexar
Cómo imponer y evaluar el uso del índice
Detalles administrativos sobre la creación y eliminación de índices
Como verás, elegir los índices adecuados para tus colecciones es fundamental para el rendimiento.
Introducción a los índices
Un índice de base de datos es similar al índice de un libro. En lugar de buscar en todo el libro, la base de datos toma un atajo y sólo busca en una lista ordenada con referencias al contenido. Esto permite a MongoDB realizar consultas órdenes de magnitud más rápidamente.
Una consulta a que no utiliza un índice se denomina escaneo de colecciones, lo que significa que el servidor tiene que "buscar por todo el libro" para encontrar los resultados de una consulta. Este proceso es básicamente lo que harías si buscaras información en un libro sin índice: empezarías por la página 1 y lo leerías todo. En general, debes evitar que el servidor realice exploraciones de colecciones, porque el proceso es muy lento para colecciones grandes.
Veamos un ejemplo en. Para empezar, crearemos una colección con 1 millón ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.