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百度搜索引擎工作原理-3-檢索排序

檢索排序是百度搜索引擎中的一個(gè)重要環(huán)節(jié)，它決定了搜索結(jié)果的排序方式，確保用戶能夠獲得最相關(guān)、最有用的搜索結(jié)果。百度搜索引擎的檢索排序主要分為兩個(gè)階段：候選集生成和排序打分。 1. 候選集生成：在這一階段，百度搜索引擎首先通過用戶輸入的關(guān)鍵詞進(jìn)行網(wǎng)頁索引的初步篩選，選取與關(guān)鍵詞相關(guān)的網(wǎng)頁進(jìn)行后續(xù)處理。百度搜索引擎通過倒排索引技術(shù)，將海量的網(wǎng)頁按關(guān)鍵詞進(jìn)行索引，以加快搜索速度和提高搜索結(jié)果的相關(guān)性。根據(jù)關(guān)鍵詞在網(wǎng)頁中的出現(xiàn)頻率、位置等信息，生成一個(gè)包含相關(guān)網(wǎng)頁的候選集。 2. 排序打分：在候選集生成后，百度搜索引擎對(duì)每個(gè)網(wǎng)頁進(jìn)行排序打分，以確定搜索結(jié)果的展示順序。在排序打分階段，百度搜索引擎考慮了多個(gè)因素，包括頁面質(zhì)量、網(wǎng)頁的外部鏈接權(quán)重、用戶體驗(yàn)等。 - 頁面質(zhì)量：百度搜索引擎會(huì)分析網(wǎng)頁的內(nèi)容質(zhì)量、頁面結(jié)構(gòu)、關(guān)鍵詞密度等因素，評(píng)估網(wǎng)頁的質(zhì)量，并根據(jù)質(zhì)量進(jìn)行排序。 - 外部鏈接權(quán)重：百度搜索引擎會(huì)分析其他網(wǎng)頁對(duì)該網(wǎng)頁的鏈接情況，根據(jù)鏈接的質(zhì)量、數(shù)量等因素，評(píng)估網(wǎng)頁的權(quán)重，并根據(jù)權(quán)重進(jìn)行排序。 - 用戶體驗(yàn)：百度搜索引擎還會(huì)考慮用戶的點(diǎn)擊行為、停留時(shí)間等因素，根據(jù)用戶的反饋信息，對(duì)搜索結(jié)果進(jìn)行調(diào)整和排序。基于以上綜合因素，百度搜索引擎會(huì)為每個(gè)網(wǎng)頁分配一個(gè)排序打分，根據(jù)打分高低，將最相關(guān)的網(wǎng)頁展示在搜索結(jié)果的前面。需要注意的是，百度搜索引擎的搜索排序算法會(huì)不斷調(diào)整和優(yōu)化，以適應(yīng)不斷變化的互聯(lián)網(wǎng)環(huán)境和用戶需求。因此，搜索結(jié)果的排序可能會(huì)因時(shí)間和地點(diǎn)的不同而有所差異。

Public @ 2023-07-24 20:00:45

Google搜索引擎的工作原理

PPCblog.com呈現(xiàn)給我們一幅由Jess Bachman（在WallStats.com工作）精心描繪的示意圖，這張流程圖展示了每天擁有3億次點(diǎn)擊量的Google搜索按鈕背后搜索引擎在那不到1秒的響應(yīng)時(shí)間內(nèi)所進(jìn)行的處理。這張流程圖演示了在你點(diǎn)擊Google搜索按鈕后，在Google返回查詢結(jié)果前那一眨眼的功夫里，Google是如何處理你的搜索請(qǐng)求的？這可是搜索巨人Google年贏利額高達(dá)200

Public @ 2013-07-27 16:21:54

搜索引擎如何抓取你的網(wǎng)頁

搜索引擎優(yōu)化（SEO）是搜索引擎有好的收錄網(wǎng)頁的過程，適當(dāng)?shù)腟EO有利于蜘蛛爬行你的網(wǎng)站，使你的內(nèi)容符合搜索引擎算法，以便確認(rèn)它與關(guān)鍵詞高度相關(guān)。優(yōu)化的目的就是使網(wǎng)頁的內(nèi)容便于蜘蛛理解，下面我就以百度新收錄的一篇內(nèi)容來進(jìn)行說明，我以一個(gè)完整標(biāo)題進(jìn)行搜索，其目的是能反映出更多關(guān)鍵詞在百度自然搜索的結(jié)果頁面，能更好的說明搜索引擎是如何抓取你的網(wǎng)頁的。搜索引擎如何抓取你的網(wǎng)頁網(wǎng)站優(yōu)化 SEO優(yōu)化 SE

Public @ 2019-08-19 16:22:21

百度搜索引擎工作原理-5-結(jié)果展現(xiàn)

結(jié)構(gòu)化數(shù)據(jù)——助力站點(diǎn)獲得更多點(diǎn)擊網(wǎng)頁經(jīng)歷了抓取建庫，參與了排序計(jì)算，最終展現(xiàn)在搜索引擎用戶面前。目前在百度搜索左側(cè)結(jié)果展現(xiàn)形式很多，如：鳳巢、品牌專區(qū)、自然結(jié)果等，一條自然結(jié)果怎樣才能獲得更多的點(diǎn)擊，是站長(zhǎng)要考慮的重要一環(huán)。目前自然結(jié)果里又分為兩類，見下圖，第一個(gè)，即結(jié)構(gòu)化展現(xiàn)，形式比較多樣。目前覆蓋80%的搜索需求，即80%的關(guān)鍵詞下會(huì)出現(xiàn)這種復(fù)雜展現(xiàn)樣式；第二個(gè)即一段摘要式展現(xiàn)，最原始的展現(xiàn)

Public @ 2021-09-11 16:21:45

百度搜索引擎工作原理-2-抓取建庫

Spider抓取系統(tǒng)的基本框架互聯(lián)網(wǎng)信息爆發(fā)式增長(zhǎng)，如何有效的獲取并利用這些信息是搜索引擎工作中的首要環(huán)節(jié)。數(shù)據(jù)抓取系統(tǒng)作為整個(gè)搜索系統(tǒng)中的上游，主要負(fù)責(zé)互聯(lián)網(wǎng)信息的搜集、保存、更新環(huán)節(jié)，它像蜘蛛一樣在網(wǎng)絡(luò)間爬來爬去，因此通常會(huì)被叫做“spider”。例如我們常用的幾家通用搜索引擎蜘蛛被稱為：Baiduspdier、Googlebot、Sogou Web Spider等。Spider抓取系統(tǒng)是搜索

Public @ 2022-09-10 16:21:47

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[ DB ] CONNECT:[ UseTime:0.025558s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.018452s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 9873 LIMIT 1 [ RunTime:0.017226s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'const', 'possible_keys' => 'PRIMARY', 'key' => 'PRIMARY', 'key_len' => '4', 'ref' => 'const', 'rows' => 1, 'extra' => NULL, ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='cate' order by times desc limit 15 [ RunTime:0.017882s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using filesort', ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='tags' order by times desc limit 100 [ RunTime:0.017848s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using filesort', ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='tags' order by rand() limit 30 [ RunTime:0.018724s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using temporary; Using filesort', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 9873 LIMIT 1 [ RunTime:0.017671s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'const', 'possible_keys' => 'PRIMARY', 'key' => 'PRIMARY', 'key_len' => '4', 'ref' => 'const', 'rows' => 1, 'extra' => NULL, ) ]
[ SQL ] update `ob_article` set views=views+1 where id=9873 [ RunTime:0.020361s ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海搜索引擎工作原理' AND `status` <> -1 LIMIT 1 [ RunTime:0.027006s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 8035, 'extra' => 'Using where', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海搜索引擎工作原理' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.042324s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 8035, 'extra' => 'Using where; Using temporary; Using filesort', ) ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海百度搜索引擎工作原理（百度搜索資源平臺(tái)）' AND `status` <> -1 LIMIT 1 [ RunTime:0.024340s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 8035, 'extra' => 'Using where', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海百度搜索引擎工作原理（百度搜索資源平臺(tái)）' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.050850s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 8035, 'extra' => 'Using where; Using temporary; Using filesort', ) ]

0.502298s