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搜索引擎工作原理

搜索引擎的工作原理基本上包括以下幾個(gè)步驟： 1. 網(wǎng)絡(luò)爬蟲：搜索引擎首先會(huì)派出網(wǎng)絡(luò)爬蟲（也稱為蜘蛛或機(jī)器人），自動(dòng)訪問(wèn)互聯(lián)網(wǎng)上的頁(yè)面，并把這些頁(yè)面的內(nèi)容和相關(guān)信息收集下來(lái)。 2. 索引：搜索引擎將爬取到的頁(yè)面內(nèi)容和相關(guān)信息存儲(chǔ)到搜索引擎數(shù)據(jù)庫(kù)中，以方便后續(xù)搜索。 3. 檢索：當(dāng)用戶輸入關(guān)鍵詞進(jìn)行搜索時(shí)，搜索引擎會(huì)根據(jù)關(guān)鍵詞從數(shù)據(jù)庫(kù)中檢索相關(guān)的頁(yè)面。 4. 排名：搜索引擎會(huì)根據(jù)一系列算法評(píng)估每個(gè)頁(yè)面的相關(guān)性和質(zhì)量，并根據(jù)結(jié)果進(jìn)行排名。排名通常以關(guān)鍵詞匹配度、頁(yè)面質(zhì)量、外部鏈接數(shù)量等因素為基礎(chǔ)。 5. 返回搜索結(jié)果：最后，搜索引擎會(huì)將排名靠前的頁(yè)面返回給用戶，以供用戶選擇。

Public @ 2023-04-19 05:00:10

搜索引擎技術(shù)揭密：中文分詞技術(shù)

信息的飛速增長(zhǎng)，使搜索引擎成為人們查找信息的首選工具，Google、百度、中國(guó)搜索等大型搜索引擎一直是人們討論的話題。隨著搜索市場(chǎng)價(jià)值的不斷增加，越來(lái)越多的公司開發(fā)出自己的搜索引擎，阿里巴巴的商機(jī)搜索、8848的購(gòu)物搜索等也陸續(xù)面世，自然，搜索引擎技術(shù)也成為技術(shù)人員關(guān)注的熱點(diǎn)。搜索引擎技術(shù)的研究，國(guó)外比中國(guó)要早近十年，從最早的Archie，到后來(lái)的Excite，以及altvista、overtur

Public @ 2011-06-23 16:12:35

百度搜索引擎工作原理

最新更新章節(jié)：2019-03-04關(guān)于百度以及其它搜索引擎的工作原理，其實(shí)大家已經(jīng)討論過(guò)很多，但隨著科技的進(jìn)步、互聯(lián)網(wǎng)業(yè)的發(fā)展，各家搜索引擎都發(fā)生著巨大的變化，并且這些變化都是飛快的。我們?cè)O(shè)計(jì)這個(gè)章節(jié)的目的，除了從官方的角度發(fā)出一些聲音、糾正一些之前的誤讀外，還希望通過(guò)不斷更新內(nèi)容，與百度搜索引擎發(fā)展保持同步，給各位站長(zhǎng)帶來(lái)最新的、與百度高相關(guān)的信息。本章主要內(nèi)容分為四個(gè)章節(jié)，分別為：抓取建庫(kù)；檢

Public @ 2014-04-22 16:21:48

搜索引擎網(wǎng)頁(yè)去重算法分析

相關(guān)統(tǒng)計(jì)數(shù)據(jù)表明：互聯(lián)網(wǎng)上近似重復(fù)的網(wǎng)頁(yè)的數(shù)量占網(wǎng)頁(yè)總數(shù)量的比例高達(dá)29%，完全相同的網(wǎng)頁(yè)大約占網(wǎng)頁(yè)總數(shù)量的22%.研究表明，在一個(gè)大型的信息采集系統(tǒng)中，30%的網(wǎng)頁(yè)是和另外70%的網(wǎng)頁(yè)完全重復(fù)或近似重復(fù)的。即：互聯(lián)網(wǎng)的網(wǎng)頁(yè)中相當(dāng)高的比例的網(wǎng)頁(yè)內(nèi)容是近似相同或完全相同的!搜索爬蟲抓取會(huì)產(chǎn)生網(wǎng)頁(yè)重復(fù)的類型：1.多個(gè)URL地址指向同一網(wǎng)頁(yè)以及鏡像站點(diǎn)如：www.sina.com 和www.sina.c

Public @ 2020-07-15 16:21:55

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

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基本文件流程錯(cuò)誤 SQL 調(diào)試

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[ DB ] CONNECT:[ UseTime:0.029680s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.021103s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 7436 LIMIT 1 [ RunTime:0.019969s ]
[ 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:0.020404s ]
[ 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:0.020731s ]
[ 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:0.020671s ]
[ 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` = 7436 LIMIT 1 [ RunTime:0.020021s ]
[ 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+2 where id=7436 [ RunTime:0.020764s ]
[ 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:0.027060s ]
[ 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:0.046205s ]
[ 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` = '威海搜索引擎工作原理' AND `status` <> -1 LIMIT 1 [ RunTime:0.027739s ]
[ 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` = '威海搜索引擎工作原理' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.046101s ]
[ 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', ) ]

0.538222s