{"id":942,"date":"2023-08-07T23:10:23","date_gmt":"2023-08-08T02:10:23","guid":{"rendered":"https:\/\/martafagundez.com\/codevolution\/?p=942"},"modified":"2024-11-17T19:38:55","modified_gmt":"2024-11-17T22:38:55","slug":"que-es-un-indice-en-una-base-de-datos","status":"publish","type":"post","link":"https:\/\/martafagundez.com\/codevolution\/que-es-un-indice-en-una-base-de-datos\/","title":{"rendered":"Qu\u00e9 es un \u00edndice en una base de datos"},"content":{"rendered":"\n<p>En una base de datos relacional, un \u00edndice es una estructura de datos asociada a uno o varios campos de una tabla que se crea con el prop\u00f3sito de <strong>acelerar las consultas<\/strong> sobre dicha tabla.<\/p>\n\n\n\n<p><\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"la-analogia-del-libro\">La analog\u00eda del libro<\/h3>\n\n\n<p>Un \u00edndice en una base de datos es muy similar a un \u00edndice en la parte posterior de un libro.<\/p>\n\n\n\n<p>Imaginemos un libro de 1000 p\u00e1ginas, dividido en 10 cap\u00edtulos, con 100 p\u00e1ginas por cap\u00edtulo. <\/p>\n\n\n\n<p>Si queremos encontrar un concepto en particular dentro de ese libro, sin una p\u00e1gina de \u00edndice, no tendr\u00edamos otra opci\u00f3n que <strong>revisar todo el libro<\/strong>, es decir: 1000 p\u00e1ginas.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/martafagundez.com\/codevolution\/wp-content\/uploads\/2023\/08\/analogia_del_libro_indice_base_de_datos-1024x576.jpg\" loading=\"lazy\" alt=\"\" class=\"wp-image-906\" srcset=\"https:\/\/martafagundez.com\/codevolution\/wp-content\/uploads\/2023\/08\/analogia_del_libro_indice_base_de_datos-1024x576.jpg 1024w, https:\/\/martafagundez.com\/codevolution\/wp-content\/uploads\/2023\/08\/analogia_del_libro_indice_base_de_datos-300x169.jpg 300w, https:\/\/martafagundez.com\/codevolution\/wp-content\/uploads\/2023\/08\/analogia_del_libro_indice_base_de_datos-768x432.jpg 768w, https:\/\/martafagundez.com\/codevolution\/wp-content\/uploads\/2023\/08\/analogia_del_libro_indice_base_de_datos-1536x864.jpg 1536w, https:\/\/martafagundez.com\/codevolution\/wp-content\/uploads\/2023\/08\/analogia_del_libro_indice_base_de_datos.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Pero con una p\u00e1gina de \u00edndice, s\u00f3lo necesitar\u00edamos buscar la palabra en el \u00edndice (que est\u00e1 ordenado alfab\u00e9ticamente) y al encontrarla -de manera mucho m\u00e1s eficiente- ir directamente a la\/s p\u00e1gina\/s donde se encuentra.<\/p>\n\n\n\n<p>Es decir, contando con un \u00edndice, tendr\u00edamos que <strong>revisar s\u00f3lo 1 \u00f3 2 p\u00e1ginas del \u00edndice<\/strong> para obtener la informaci\u00f3n que buscamos\u2026 en vez de tener que revisar las 1000 p\u00e1ginas del libro.<\/p>\n\n\n\n<p><\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"indices-implicitos\">\u00cdndices impl\u00edcitos<\/h3>\n\n\n<p>Los \u00edndices impl\u00edcitos son \u00edndices que <strong>el servidor de la base de datos crea autom\u00e1ticamente<\/strong> para la PK y las UK de las tablas.<\/p>\n\n\n\n<p><\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"cuando-usar-indices-y-cuando-no\">Cu\u00e1ndo usar \u00edndices y cu\u00e1ndo no<\/h3>\n\n\n<p>Los \u00edndices pueden mejorar la performance de las consultas, pero tambi\u00e9n implican ciertos \u00abcostos\u00bb.<\/p>\n\n\n\n<p><strong>Costos de espacio<\/strong>, ya que las tablas creadas para almacenar los \u00edndices ocupan espacio en la base de datos.<\/p>\n\n\n\n<p>Y <strong>costos de tiempo y recursos<\/strong>, ya que cada vez que se \u00abescribe\u00bb (UPDATE, INSERT o DELETE) en una tabla indexada, adem\u00e1s de actualizar la propia tabla se tienen que actualizar todas las tablas de \u00edndice definidas sobre ella.<\/p>\n\n\n\n<p>En cada caso se tendr\u00e1 que evaluar costos vs. beneficios para decidir en qu\u00e9 tablas y en qu\u00e9 campos la creaci\u00f3n de un \u00edndice puede mejorar la performance de la base de datos.<\/p>\n\n\n\n<p>Sin embargo, hay algunas circunstancias frente a las cuales t\u00edpicamente se suele recomendar o desaconsejar su uso.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Se suele recomendar su uso en<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>tablas que tienen grandes vol\u00famenes de datos<\/li>\n\n\n\n<li>tablas que tienen pocas necesidades de actualizaci\u00f3n<\/li>\n\n\n\n<li>tablas que reciben gran cantidad de consultas (SELECT)<\/li>\n\n\n\n<li>campos referenciados frecuentemente desde cl\u00e1usulas WHERE<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Se suele desaconsejar su uso en<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>tablas con poco datos<\/li>\n\n\n\n<li>tablas que tienen operaciones de inserci\u00f3n o modificaci\u00f3n grandes y frecuentes<\/li>\n\n\n\n<li>campos que contienen muchos valores nulos<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>En una base de datos relacional, un \u00edndice es una estructura de datos asociada a uno o varios campos de una tabla que se crea&#8230;<\/p>\n","protected":false},"author":1,"featured_media":904,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[39,27,42],"tags":[35],"class_list":["post-942","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-backend","category-bases-de-datos","category-desarrollo-web","tag-back-end"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu\u00e9 es un \u00edndice en una base de datos - CODEvolution<\/title>\n<meta name=\"robots\" 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