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為什么抓取頻次突然減少？

抓取頻次突然減少的原因可能有多種。以下是一些可能的原因： 1. 網(wǎng)站出現(xiàn)了技術(shù)故障或服務(wù)器問題，導(dǎo)致抓取程序無法正常訪問網(wǎng)站。這可能是由于服務(wù)器維護(hù)、更新或其他問題所引起的，通常是暫時(shí)性的。 2. 網(wǎng)站的robots.txt文件更改了抓取器的訪問權(quán)限。robots.txt是網(wǎng)站所有者用來指示搜索引擎抓取程序哪些頁面可以被索引的文件。如果該文件禁止抓取器訪問網(wǎng)站的某些或全部內(nèi)容，抓取頻次會相應(yīng)地減少。 3. 網(wǎng)站的HTTP響應(yīng)頭中的"X-RateLimit"標(biāo)頭發(fā)生變化，限制了對網(wǎng)站的請求頻率。這是一種常見的限制措施，用于防止惡意或過度使用抓取器的行為。 4. 抓取程序的配置文件更改了抓取頻次設(shè)置，導(dǎo)致減少了抓取次數(shù)。這可能是出于不同的原因，比如網(wǎng)站所有者的要求、抓取策略的調(diào)整等。 5. 網(wǎng)站的內(nèi)容發(fā)生了變化，抓取程序可能會根據(jù)變化的情況進(jìn)行自適應(yīng)，減少對某些頁面或資源的抓取頻次。 6. 機(jī)器或網(wǎng)絡(luò)故障導(dǎo)致抓取程序無法正常工作或訪問網(wǎng)絡(luò)，從而減少了抓取頻次。以上僅僅是一些常見的原因，具體情況可能因?yàn)椴煌木W(wǎng)站和抓取程序而有所不同。如果發(fā)現(xiàn)抓取頻次減少，建議檢查以上因素，以確定具體的原因，并采取相應(yīng)的措施。

Public @ 2023-07-23 22:50:32

移動(dòng)化培訓(xùn)長沙視頻6——移動(dòng)適配生效要點(diǎn)

跳轉(zhuǎn)適配在現(xiàn)階段還是百度移動(dòng)搜索中的主力，但是一個(gè)PC頁一個(gè)移動(dòng)頁面，且不說收錄，只讓百度明白其中的對應(yīng)關(guān)系就很讓人頭痛。其實(shí)也沒有那么難啦，學(xué)院邀請社區(qū)版主三木做過《跳轉(zhuǎn)適配成功生效經(jīng)驗(yàn)分享》，再次邀請大家拜讀一下。除此之外，昨天（ 11月13日）我們也邀請移動(dòng)適配數(shù)據(jù)處理工程師在培訓(xùn)QQ群中進(jìn)行了現(xiàn)場語音QA，下周會將文字版整理出來，大家時(shí)刻關(guān)注學(xué)院內(nèi)容吧。今天我們先來看看劉院長在長沙培訓(xùn)時(shí)，

Public @ 2010-04-20 16:02:14

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基本文件流程錯(cuò)誤 SQL 調(diào)試

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[ DB ] CONNECT:[ UseTime:0.026358s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.019215s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 9830 LIMIT 1 [ RunTime:0.017923s ]
[ 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:0.018027s ]
[ 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:0.018275s ]
[ 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:0.018746s ]
[ 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` = 9830 LIMIT 1 [ RunTime:0.017706s ]
[ 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=9830 [ RunTime:0.018596s ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海百度搜索資源平臺' AND `status` <> -1 LIMIT 1 [ RunTime:0.024515s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, 'extra' => 'Using where', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海百度搜索資源平臺' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.045548s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, 'extra' => 'Using where; Using temporary; Using filesort', ) ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海百度搜索資源平臺' AND `status` <> -1 LIMIT 1 [ RunTime:0.024591s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, 'extra' => 'Using where', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海百度搜索資源平臺' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.048979s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, 'extra' => 'Using where; Using temporary; Using filesort', ) ]

0.490801s

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為什么抓取頻次突然減少？

移動(dòng)化培訓(xùn)長沙視頻6——移動(dòng)適配生效要點(diǎn)

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為什么抓取頻次突然減少？

移動(dòng)化培訓(xùn)長沙視頻6——移動(dòng)適配生效要點(diǎn)

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為什么抓取頻次突然減少？