PHP企業(yè)級(jí)應(yīng)用常見快取技術(shù)深入解讀_PHP教程
Jul 22, 2016 am 09:02 AM
php
企業(yè)級(jí)
常見
科技
數(shù)據(jù)
資料庫
查詢
深入
快取
解讀
普遍快取技術(shù)
資料快取：這裡所說的資料快取是指資料庫查詢緩存，每次造訪頁面的時(shí)候,都會(huì)先偵測對(duì)應(yīng)的快取數(shù)據(jù)是否存在，如果不存在，就連接資料庫，得到數(shù)據(jù)， 並把查詢結(jié)果序列化後保存到文件中，以後同樣的查詢結(jié)果就直接從緩存表或文件中獲得。
用的最廣的例子看Discuz的搜尋功能，把結(jié)果ID快取到一個(gè)表中，下次搜尋相同關(guān)鍵字時(shí)先搜尋快取表。
舉個(gè)常用的方法，多表關(guān)聯(lián)的時(shí)候，把附表中的內(nèi)容生成數(shù)組保存到主表的一個(gè)字段中，需要的時(shí)候數(shù)組分解一下，這樣的好處是只讀一個(gè)表，壞處就是兩個(gè)資料同步會(huì)多不少步驟，資料庫永遠(yuǎn)是瓶頸，用硬碟換速度，是這個(gè)的關(guān)鍵點(diǎn)。
頁面快?。?/strong>
每次造訪頁面的時(shí)候，都會(huì)先偵測對(duì)應(yīng)的快取頁面檔案是否存在，如果不存在，就連接資料庫，得到數(shù)據(jù)，顯示頁面並同時(shí)產(chǎn)生快取頁面文件，這樣下次造訪的時(shí)候頁面文件就發(fā)揮作用了。 (模板引擎和網(wǎng)路上常見的一些快取類別通常有此功能)
時(shí)間觸發(fā)快?。?/strong>
檢查檔案是否存在且時(shí)間戳小於設(shè)定的過期時(shí)間,如果檔案修改的時(shí)間戳比目前時(shí)間戳記減去過期時(shí)間戳大，那麼就用緩存，否則更新快取。
內(nèi)容觸發(fā)快取：
當(dāng)插入資料或更新資料時(shí)，強(qiáng)制更新快取。
靜態(tài)快?。?/strong>
這裡所說的靜態(tài)快取是指靜態(tài)化，直接產(chǎn)生HTML或xml等文字文件，有更新的時(shí)候重生成一次，適合於不太變化的頁面，這就不說了。
以上內(nèi)容是程式碼級(jí)的解決方案，我直接CP別的框架，也懶得改，內(nèi)容都差不多，很容易就做到，而且會(huì)幾種方式一起用，但下面的內(nèi)容是伺服器端的快取方案，非程式碼級(jí)的，要有多方的合作才能做到
記憶體快取:
Memcached是高效能的，分散式的記憶體物件快取系統(tǒng)，用於在動(dòng)態(tài)應(yīng)用中減少資料庫負(fù)載，提升存取速度。
這裡說下Memcached的例子：
<ol class="dp-c"> <li class="alt"><span><span><?php </span></span></li><li><span class="vars">$memcache</span><span> = </span><span class="keyword">new</span><span> Memcache; </span></li><li class="alt"><span class="vars">$memcache</span><span>->connect(‘localhost’,?11211)?</span><span class="keyword">or</span><span>?</span><span class="keyword">die</span><span>?(“Could?not?connect”); ?</span></span></li> <li> <span class="vars">$version</span><span>?=?</span><span class="vars">$memcache</span><span>->getVersion(); ?</span> </li> <li class="alt"> <span class="func">echo</span><span>?“Server’s?version:?“.</span><span class="vars">$version</span><span>.”n”; ?</span> </li> <li> <span class="vars">$tmp_object</span><span>?=?</span><span class="keyword">new</span><span>?stdClass; ?</span> </li> <li class="alt"> <span class="vars">$tmp_object</span><span>->str_attr?=?‘test’; ?</span> </li> <li> <span class="vars">$tmp_object</span><span>->int_attr?=?123; ?</span> </li> <li class="alt"> <span class="vars">$memcache</span><span>->set(‘key’,?</span><span class="vars">$tmp_object</span><span>,?false,?10)?</span><span class="keyword">or</span><span>?</span><span class="keyword">die</span><span>?(“Failed?to?save?data?at?the?server”); ?</span> </li> <li> <span class="func">echo</span><span>?“Store?data?in?the?cache?(data?will?expire?in?10?seconds)n”; ?</span> </li> <li class="alt"> <span class="vars">$get_result</span><span>?=?</span><span class="vars">$memcache</span><span>->get(‘key’); ?</span> </li> <li> <span class="func">echo</span><span>?“Data?from?the?cache:n”; ?</span> </li> <li class="alt"> <span>var_dump(</span><span class="vars">$get_result</span><span>); ?</span> </li> <li><span>?>?</span></li> </ol>
讀庫的例子：
<ol class="dp-c">
<li class="alt"><span><span><?php </span></span></li><li><span class="vars">$sql</span><span> = ‘SELECT * FROM users’; </span></li><li class="alt"><span class="vars">$key</span><span> = md5(</span><span class="vars">$sql</span><span>); </span><span class="comment">//memcached 對(duì)象標(biāo)識(shí)符 </span><span> </span></li><li><span class="keyword">if</span><span> ( !(</span><span class="vars">$datas</span><span> = </span><span class="vars">$mc</span><span>->get(</span><span class="vars">$key</span><span>))?)?{ ?</span></span></li>
<li class="alt">
<span class="comment">//??在?memcached?中未獲取到緩存數(shù)據(jù)，則使用數(shù)據(jù)庫查詢獲取記錄集。 </span><span>?</span>
</li>
<li>
<span class="func">echo</span><span>?“n”.</span><span class="func">str_pad</span><span>(‘Read?datas?from?MySQL.’,?60,?‘_’).”n”; ?</span>
</li>
<li class="alt">
<span class="vars">$conn</span><span>?=?mysql_connect(‘localhost’,?‘test’,?‘test’); ?</span>
</li>
<li><span>mysql_select_db(‘test’); ?</span></li>
<li class="alt">
<span class="vars">$result</span><span>?=?mysql_query(</span><span class="vars">$sql</span><span>); ?</span>
</li>
<li>
<span class="keyword">while</span><span>?(</span><span class="vars">$row</span><span>?=?mysql_fetch_object(</span><span class="vars">$result</span><span>)) ?</span>
</li>
<li class="alt">
<span class="vars">$datas</span><span>[]?=?</span><span class="vars">$row</span><span>; ?</span>
</li>
<li>
<span class="comment">//??將數(shù)據(jù)庫中獲取到的結(jié)果集數(shù)據(jù)保存到?memcached?中，以供下次訪問時(shí)使用。 </span><span>?</span>
</li>
<li class="alt">
<span class="vars">$mc</span><span>->add(</span><span class="vars">$key</span><span>,?</span><span class="vars">$datas</span><span>); ?</span>
</li>
<li>
<span>}?</span><span class="keyword">else</span><span>?{ ?</span>
</li>
<li class="alt">
<span class="func">echo</span><span>?“n”.</span><span class="func">str_pad</span><span>(‘Read?datas?from?memcached.’,?60,?‘_’).”n”; ?</span>
</li>
<li><span>} ?</span></li>
<li class="alt">
<span>var_dump(</span><span class="vars">$datas</span><span>); ?</span>
</li>
<li><span>?>?</span></li>
</ol>
PHP的緩衝器：
有eaccelerator， apc， PHPa，xcache，這個(gè)這個(gè)就不說了吧，搜尋一堆一堆的，自己看啦，知道有這玩意就OK
MYSQL快?。?/strong>
這也算非程式碼級(jí)的，經(jīng)典的資料庫就是用的這種方式，看下面的運(yùn)行時(shí)間，0.09xxx之類的
我貼段根據(jù)藍(lán)色那傢伙修改後部分my.ini 吧，2G的MYISAM表可以在0.05S左右，據(jù)說他前後改了有快一年
<ol class="dp-c"> <li class="alt"><span><span>[client] ?</span></span></li> <li><span>…… ?</span></li> <li class="alt"> <span class="keyword">default</span><span>-character-set=gbk ?</span> </li> <li> <span class="keyword">default</span><span>-storage-engine=MYISAM ?</span> </li> <li class="alt"><span>max_connections=600 ?</span></li> <li><span>max_connect_errors=500 ?</span></li> <li class="alt"><span>back_log=200 ?</span></li> <li><span>interactive_timeout=7200 ?</span></li> <li class="alt"><span>query_cache_size=64M ?</span></li> <li><span>…… ?</span></li> <li class="alt"><span>table_cache=512 ?</span></li> <li><span>…… ?</span></li> <li class="alt"><span>myisam_max_sort_file_size=100G ?</span></li> <li><span>myisam_max_extra_sort_file_size=100G ?</span></li> <li class="alt"><span>myisam_sort_buffer_size=128M ?</span></li> <li><span>key_buffer_size=1024M ?</span></li> <li class="alt"><span>read_buffer_size=512M ?</span></li> <li><span>…… ?</span></li> <li class="alt"><span>thread_concurrency=8?</span></li> </ol>
基於反向代理的Web快取:
如Nginx，SQUID，mod_PRoxy(apache2以上又分為mod_proxy和mod_cache)
NGINX的例子
<ol class="dp-c">
<li class="alt"><span><span><nginx.conf> ?</span></span></li>
<li><span>#user??nobody; ?</span></li>
<li class="alt"><span>worker_processes??4; ?</span></li>
<li>
<span class="func">error_log</span><span>??logs/error.log?crit; ?</span>
</li>
<li class="alt"><span>pid????????logs/nginx.pid; ?</span></li>
<li><span>worker_rlimit_nofile?10240; ?</span></li>
<li class="alt"><span>events?{ ?</span></li>
<li>
<span class="keyword">use</span><span>?epoll; ?</span>
</li>
<li class="alt"><span>worker_connections??51200; ?</span></li>
<li><span>} ?</span></li>
<li class="alt"><span>http?{ ?</span></li>
<li>
<span class="keyword">include</span><span>???????mime.types; ?</span>
</li>
<li class="alt"><span>default_type??application/octet-stream; ?</span></li>
<li><span>sendfile????on; ?</span></li>
<li class="alt"><span>keepalive_timeout?65; ?</span></li>
<li><span>tcp_nodelay?on; ?</span></li>
<li class="alt"><span>#?server?pool ?</span></li>
<li><span>upstream?bspfrontsvr?{ ?</span></li>
<li class="alt"><span>server?10.10.10.224:80???weight=1; ?</span></li>
<li><span>server?10.10.10.221:80???weight=1; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>?</span></li>
<li class="alt"><span>upstream?bspimgsvr?{ ?</span></li>
<li><span>server?10.10.10.201:80???weight=1; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>?</span></li>
<li class="alt"><span>upstream?bspstylesvr?{ ?</span></li>
<li><span>server?10.10.10.202:80???weight=1; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>?</span></li>
<li class="alt"><span>upstream?bsphelpsvr?{ ?</span></li>
<li><span>server?10.10.10.204:80???weight=1; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>?</span></li>
<li class="alt"><span>upstream?bspwsisvr?{ ?</span></li>
<li><span>server?10.10.10.203:80???weight=1; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>?</span></li>
<li class="alt"><span>upstream?bspadminsvr?{ ?</span></li>
<li><span>server?10.10.10.222:80???weight=1; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>?</span></li>
<li class="alt"><span>upstream?bspbuyersvr?{ ?</span></li>
<li><span>server?10.10.10.223:80???weight=1; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>?</span></li>
<li class="alt"><span>upstream?bspsellersvr?{ ?</span></li>
<li><span>server?10.10.10.225:80???weight=1; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>upstream??bsploginsvr??{ ?</span></li>
<li class="alt"><span>server?10.10.10.220:443??weight=1; ?</span></li>
<li><span>} ?</span></li>
<li class="alt"><span>upstream??bspregistersvr??{ ?</span></li>
<li><span>server?10.10.10.220:80??weight=1; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li>
<span>log_format??test_com??‘</span><span class="vars">$remote_addr</span><span>?–?</span><span class="vars">$remote_user</span><span>?[</span><span class="vars">$time_local</span><span>]?“</span><span class="vars">$request</span><span>”?‘ ?</span>
</li>
<li class="alt">
<span>‘</span><span class="vars">$status</span><span>?</span><span class="vars">$body_bytes_sent</span><span>?“</span><span class="vars">$http_referer</span><span>”?“</span><span class="vars">$http_user_agent</span><span>”?‘; ?</span>
</li>
<li><span>#——————————————————————– ?</span></li>
<li class="alt"><span>#img.test.com ?</span></li>
<li><span>server?{ ?</span></li>
<li class="alt"><span>listen???????10.10.10.230:80; ?</span></li>
<li><span>server_name??img.test.com; ?</span></li>
<li class="alt"><span>location?/?{ ?</span></li>
<li>
<span>proxy_pass??????http:</span><span class="comment">//bspimgsvr; </span><span>?</span>
</li>
<li class="alt">
<span class="keyword">include</span><span>?????????proxy_setting.conf; ?</span>
</li>
<li><span>} ?</span></li>
<li class="alt"><span>access_log??logs/img.log??test_com; ?</span></li>
<li><span>} ?</span></li>
<li class="alt"><span>?</span></li>
<li><span>#style.test.com ?</span></li>
<li class="alt"><span>server?{ ?</span></li>
<li><span>listen???????10.10.10.230:80; ?</span></li>
<li class="alt"><span>server_name??style.test.com; ?</span></li>
<li><span>location?/?{ ?</span></li>
<li class="alt">
<span>proxy_pass??????http:</span><span class="comment">//bspstylesvr; </span><span>?</span>
</li>
<li>
<span class="keyword">include</span><span>?????????proxy_setting.conf; ?</span>
</li>
<li class="alt"><span>} ?</span></li>
<li><span>access_log??logs/style.log??test_com; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>?</span></li>
<li class="alt"><span>#help.test.com ?</span></li>
<li><span>server?{ ?</span></li>
<li class="alt"><span>listen???????10.10.10.230:80; ?</span></li>
<li><span>server_name??help.test.com; ?</span></li>
<li class="alt"><span>location?/?{ ?</span></li>
<li>
<span>proxy_pass??????http:</span><span class="comment">//bsphelpsvr; </span><span>?</span>
</li>
<li class="alt">
<span class="keyword">include</span><span>?????????proxy_setting.conf; ?</span>
</li>
<li><span>} ?</span></li>
<li class="alt"><span>access_log??logs/help.log??test_com; ?</span></li>
<li><span>} ?</span></li>
<li class="alt"><span>?</span></li>
<li><span>#admin.test.com ?</span></li>
<li class="alt"><span>server?{ ?</span></li>
<li><span>listen???????10.10.10.230:80; ?</span></li>
<li class="alt"><span>server_name??admin.test.com; ?</span></li>
<li><span>location?/?{ ?</span></li>
<li class="alt">
<span>proxy_pass??????http:</span><span class="comment">//bspadminsvr; </span><span>?</span>
</li>
<li>
<span class="keyword">include</span><span>?????????proxy_setting.conf; ?</span>
</li>
<li class="alt"><span>} ?</span></li>
<li><span>access_log??logs/admin.log??test_com; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>?</span></li>
<li class="alt"><span>#buyer.test.com ?</span></li>
<li><span>server?{ ?</span></li>
<li class="alt"><span>listen???????10.10.10.230:80; ?</span></li>
<li><span>server_name??buyer.test.com; ?</span></li>
<li class="alt"><span>location?/?{ ?</span></li>
<li>
<span>proxy_pass??????http:</span><span class="comment">//bspbuyersvr; </span><span>?</span>
</li>
<li class="alt">
<span class="keyword">include</span><span>?????????proxy_setting.conf; ?</span>
</li>
<li><span>} ?</span></li>
<li class="alt"><span>access_log??logs/buyer.log??test_com; ?</span></li>
<li><span>} ?</span></li>
<li class="alt"><span>?</span></li>
<li><span>#seller.test.com ?</span></li>
<li class="alt"><span>server?{ ?</span></li>
<li><span>listen???????10.10.10.230:80; ?</span></li>
<li class="alt"><span>server_name??seller.test.com; ?</span></li>
<li><span>location?/?{ ?</span></li>
<li class="alt">
<span>proxy_pass??????http:</span><span class="comment">//bspsellersvr; </span><span>?</span>
</li>
<li>
<span class="keyword">include</span><span>?????????proxy_setting.conf; ?</span>
</li>
<li class="alt"><span>} ?</span></li>
<li><span>access_log??logs/seller.log??test_com; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>#wsi.test.com ?</span></li>
<li class="alt"><span>server?{ ?</span></li>
<li><span>listen???????10.10.10.230:80; ?</span></li>
<li class="alt"><span>server_name??wsi.test.com; ?</span></li>
<li><span>location?/?{ ?</span></li>
<li class="alt">
<span>proxy_pass??????http:</span><span class="comment">//bspwsisvr; </span><span>?</span>
</li>
<li>
<span class="keyword">include</span><span>?????????proxy_setting.conf; ?</span>
</li>
<li class="alt"><span>} ?</span></li>
<li><span>access_log??logs/wsi.log??test_com; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>#www.test.com ?</span></li>
<li class="alt"><span>server?{ ?</span></li>
<li><span>listen???????10.10.10.230:80; ?</span></li>
<li class="alt"><span>server_name??www.test.com???*.test.com; ?</span></li>
<li><span>location?~?^/NginxStatus/?{ ?</span></li>
<li class="alt"><span>stub_status?on; ?</span></li>
<li><span>access_log?off; ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>location?/?{ ?</span></li>
<li class="alt">
<span>proxy_pass??????http:</span><span class="comment">//bspfrontsvr; </span><span>?</span>
</li>
<li>
<span class="keyword">include</span><span>?????????proxy_setting.conf; ?</span>
</li>
<li class="alt"><span>} ?</span></li>
<li><span>access_log??logs/www.log??test_com; ?</span></li>
<li class="alt"><span>error_page???500?502?503?504??/50x.html; ?</span></li>
<li><span>location?=?/50x.html?{ ?</span></li>
<li class="alt"><span>root???html; ?</span></li>
<li><span>} ?</span></li>
<li class="alt"><span>} ?</span></li>
<li><span>#login.test.com ?</span></li>
<li class="alt"><span>server?{ ?</span></li>
<li><span>listen???????10.10.10.230:443; ?</span></li>
<li class="alt"><span>server_name??login.test.com; ?</span></li>
<li><span>ssl??????????????????on; ?</span></li>
<li class="alt"><span>ssl_certificate??????cert.pem; ?</span></li>
<li><span>ssl_certificate_key??cert.key; ?</span></li>
<li class="alt"><span>ssl_session_timeout??5m; ?</span></li>
<li><span>ssl_protocols??SSLv2?SSLv3?TLSv1; ?</span></li>
<li class="alt">
<span>ssl_ciphers??ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+</span><span class="func">EXP</span><span>; ?</span>
</li>
<li><span>ssl_prefer_server_ciphers???on; ?</span></li>
<li class="alt"><span>location?/?{ ?</span></li>
<li>
<span>proxy_pass????????https:</span><span class="comment">//bsploginsvr; </span><span>?</span>
</li>
<li class="alt">
<span class="keyword">include</span><span>?????????proxy_setting.conf; ?</span>
</li>
<li><span>} ?</span></li>
<li class="alt"><span>access_log??logs/login.log??test_com; ?</span></li>
<li><span>} ?</span></li>
<li class="alt">
<span>#login.test.com?</span><span class="keyword">for</span><span>?register ?</span>
</li>
<li><span>server?{ ?</span></li>
<li class="alt"><span>listen???????10.10.10.230:80; ?</span></li>
<li><span>server_name??login.test.com; ?</span></li>
<li class="alt"><span>location?/?{ ?</span></li>
<li>
<span>proxy_pass????????http:</span><span class="comment">//bspregistersvr; </span><span>?</span>
</li>
<li class="alt">
<span class="keyword">include</span><span>?????????proxy_setting.conf; ?</span>
</li>
<li><span>} ?</span></li>
<li class="alt"><span>access_log??logs/register.log??test_com; ?</span></li>
<li><span>} ?</span></li>
<li class="alt"><span>?</span></li>
<li><span>} ?</span></li>
<li class="alt"><span><conf/proxy_setting.conf> ?</span></li>
<li><span>proxy_redirect??????????off; ?</span></li>
<li class="alt">
<span>proxy_set_header????????Host?</span><span class="vars">$host</span><span>; ?</span>
</li>
<li>
<span>proxy_set_header????????X-Real-IP?</span><span class="vars">$remote_addr</span><span>; ?</span>
</li>
<li class="alt">
<span>proxy_set_header????????X-Forwarded-For?</span><span class="vars">$proxy_add_x_forwarded_for</span><span>; ?</span>
</li>
<li><span>client_max_body_size????10m; ?</span></li>
<li class="alt"><span>client_body_buffer_size?128k; ?</span></li>
<li><span>proxy_connect_timeout???90; ?</span></li>
<li class="alt"><span>proxy_send_timeout??????90; ?</span></li>
<li><span>proxy_read_timeout??????90; ?</span></li>
<li class="alt"><span>proxy_buffer_size???????4k; ?</span></li>
<li><span>proxy_buffers???????????4?32k; ?</span></li>
<li class="alt"><span>proxy_busy_buffers_size?64k; ?</span></li>
<li><span>proxy_temp_file_write_size?64k; ?</span></li>
<li class="alt"><span>mod_proxy的例子： ?</span></li>
<li><span>?</span></li>
<li class="alt"><span><VirtualHost *> ?</span></li>
<li><span>ServerName?www.zxsv.com ?</span></li>
<li class="alt"><span>ServerAdmin?admin@zxsv.com ?</span></li>
<li><span>#?reverse?proxy?setting ?</span></li>
<li class="alt">
<span>ProxyPass?/?http:</span><span class="comment">//www.zxsv.com:8080/ </span><span>?</span>
</li>
<li>
<span>ProxyPassReverse?/?http:</span><span class="comment">//www.zxsv.com:8080/ </span><span>?</span>
</li>
<li class="alt"><span>#?cache?dir?root ?</span></li>
<li>
<span>CacheRoot?“/</span><span class="keyword">var</span><span>/www/proxy” ?</span>
</li>
<li class="alt"><span>#?max?cache?storage ?</span></li>
<li><span>CacheSize?50000000 ?</span></li>
<li class="alt"><span>#?hour:?every?4?hour ?</span></li>
<li><span>CacheGcInterval?4 ?</span></li>
<li class="alt"><span>#?max?page?expire?time:?hour ?</span></li>
<li><span>CacheMaxExpire?240 ?</span></li>
<li class="alt"><span>#?Expire?time?=?(now?–?last_modified)?*?CacheLastModifiedFactor ?</span></li>
<li><span>CacheLastModifiedFactor?0.1 ?</span></li>
<li class="alt"><span>#?defalt?expire?tag:?hour ?</span></li>
<li><span>CacheDefaultExpire?1 ?</span></li>
<li class="alt"><span>#?force?complete?after?precent?of?content?retrived:?60-90% ?</span></li>
<li><span>CacheForceCompletion?80 ?</span></li>
<li class="alt"><span>CustomLog?/usr/local/apache/logs/dev_access_log?combined ?</span></li>
<li><span></VirtualHost>?</span></li>
</ol>而SQUID的例子我就不說明了，這方面網(wǎng)上有寫的太多，大家自己搜尋一下
DNS輪詢：
BIND是一款開放原始碼的DNS伺服器軟體，這個(gè)要說起來就大了，自己搜尋去，大家知道有這個(gè)東西就行了。 我知道的有chinacache 等大站就是這樣做的，說簡單點(diǎn)就是多伺服器啦，把同一個(gè)頁面或檔案快取到不同的伺服器上，按南北自動(dòng)解析到相關(guān)的伺服器中。http://www.cnblogs.com/cnblogs20112011/archive/2011/01/27/1946286.html
http://www.bkjia.com/PHPjc/445846.html
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