{"id":11886,"date":"2015-07-31T11:46:31","date_gmt":"2015-07-31T15:46:31","guid":{"rendered":"http:\/\/mjtsai.com\/blog\/?p=11886"},"modified":"2015-07-31T11:46:31","modified_gmt":"2015-07-31T15:46:31","slug":"sqlite-fts5","status":"publish","type":"post","link":"https:\/\/mjtsai.com\/blog\/2015\/07\/31\/sqlite-fts5\/","title":{"rendered":"SQLite FTS5"},"content":{"rendered":"<p><a href=\"https:\/\/www.sqlite.org\/releaselog\/3_8_11_1.html\">SQLite Release Notes<\/a>:<\/p>\n<blockquote cite=\"https:\/\/www.sqlite.org\/releaselog\/3_8_11_1.html\"><p>Added the experimental FTS5 extension. Note that this extension is experimental and subject to change in incompatible ways.<\/p><\/blockquote>\n<p><a href=\"https:\/\/www.sqlite.org\/fts5.html\">SQLite FTS5 Extension<\/a>:<\/p>\n<blockquote cite=\"https:\/\/www.sqlite.org\/fts5.html\">\n<p>The principle difference between FTS3\/4 and FTS5 is that in FTS3\/4,\neach instance-list is stored as a single large database record, whereas\nin FTS5 large instance-lists are divided between multiple database records.\nThis has the following implications for dealing with large databases that\ncontain large lists:\n\n<\/p><ul>\n  <li> <p>FTS5 is able to load instance-lists into memory incrementally in\n       order to reduce memory usage and peak allocation size. FTS3\/4 very\n       often loads entire instance-lists into memory.\n\n  <\/p><\/li><li> <p>When processing queries that feature more than one token, FTS5 is\n       sometimes able to determine that the query can be answered by\n       inspecting a subset of a large instance-list. FTS3\/4 almost always\n       has to traverse entire instance-lists.\n\n  <\/p><\/li><li> If an instance-list grows so large that it exceeds\n       the SQLITE_MAX_LENGTH limit, FTS3\/4 is unable to handle it. FTS5\n       does not have this problem. \n<\/li><\/ul>\n<p>[&#8230;]<\/p>\n<p>FTS5 has no matchinfo() or offsets() function, and the snippet() function is not as fully-featured as in FTS3\/4. However, since FTS5 does provide an API allowing applications to create custom auxiliary functions, any required functionality may be implemented within the application code.<\/p>\n<p>The set of built-in auxiliary functions provided by FTS5 may be improved upon in the future.<\/p>\n<\/blockquote>","protected":false},"excerpt":{"rendered":"<p>SQLite Release Notes: Added the experimental FTS5 extension. Note that this extension is experimental and subject to change in incompatible ways. SQLite FTS5 Extension: The principle difference between FTS3\/4 and FTS5 is that in FTS3\/4, each instance-list is stored as a single large database record, whereas in FTS5 large instance-lists are divided between multiple database [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"apple_news_api_created_at":"","apple_news_api_id":"","apple_news_api_modified_at":"","apple_news_api_revision":"","apple_news_api_share_url":"","apple_news_coverimage":0,"apple_news_coverimage_caption":"","apple_news_is_hidden":false,"apple_news_is_paid":false,"apple_news_is_preview":false,"apple_news_is_sponsored":false,"apple_news_maturity_rating":"","apple_news_metadata":"\"\"","apple_news_pullquote":"","apple_news_pullquote_position":"","apple_news_slug":"","apple_news_sections":"\"\"","apple_news_suppress_video_url":false,"apple_news_use_image_component":false,"footnotes":""},"categories":[4],"tags":[978,74,138,71,425],"class_list":["post-11886","post","type-post","status-publish","format-standard","hentry","category-programming-category","tag-full-text-search","tag-opensource","tag-optimization","tag-programming","tag-sqlite"],"apple_news_notices":[],"_links":{"self":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/11886","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/comments?post=11886"}],"version-history":[{"count":1,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/11886\/revisions"}],"predecessor-version":[{"id":11887,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/11886\/revisions\/11887"}],"wp:attachment":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/media?parent=11886"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/categories?post=11886"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/tags?post=11886"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}