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標(biāo)題: PHP企業(yè)級(jí)應(yīng)用緩存技術(shù)詳解 [打印本頁(yè)]

作者: 三里屯搖滾    時(shí)間: 2012-01-19 17:07
標(biāo)題: PHP企業(yè)級(jí)應(yīng)用緩存技術(shù)詳解
PHP企業(yè)級(jí)應(yīng)用緩存技術(shù)詳解




之前我們?cè)钊氲奶接戇^(guò)PHP緩存技術(shù),其中主要提到了數(shù)據(jù)緩存。數(shù)據(jù)緩存主要是指數(shù)據(jù)庫(kù)查詢緩存,每次訪問(wèn)頁(yè)面的時(shí)候,都會(huì)先檢測(cè)相應(yīng)的緩存數(shù)據(jù)是否存在,如果不存在,就連接數(shù)據(jù)庫(kù),得到數(shù)據(jù), 并把查詢結(jié)...     




  之前我們?cè)钊氲奶接戇^(guò)PHP緩存技術(shù),其中主要提到了數(shù)據(jù)緩存。數(shù)據(jù)緩存主要是指數(shù)據(jù)庫(kù)查詢緩存,每次訪問(wèn)頁(yè)面的時(shí)候,都會(huì)先檢測(cè)相應(yīng)的緩存數(shù)據(jù)是否存在,如果不存在,就連接數(shù)據(jù)庫(kù),得到數(shù)據(jù), 并把查詢結(jié)果序列化后保存到文件中,以后同樣的查詢結(jié)果就直接從緩存表或文件中獲得。

  用的最廣的例子看Discuz的搜索功能,把結(jié)果ID緩存到一個(gè)表中,下次搜索相同關(guān)鍵字時(shí)先搜索緩存表。

  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) 數(shù)據(jù)同步會(huì)多不少步驟,數(shù)據(jù)庫(kù)永遠(yuǎn)是瓶頸,用硬盤(pán)換速度,是這個(gè)的關(guān)鍵點(diǎn)。

  頁(yè)面緩存

  每次訪問(wèn)頁(yè)面的時(shí)候,都會(huì)先檢測(cè)相應(yīng)的緩存頁(yè)面文件是否存在,如果不存在,就連接數(shù)據(jù)庫(kù),得到數(shù)據(jù),顯示頁(yè)面并同時(shí)生成緩存頁(yè)面文件,這樣下次訪問(wèn) 的時(shí)候頁(yè)面文件就發(fā)揮作用了。(模板引擎和網(wǎng)上常見(jiàn)的一些緩存類通常有此功能)

  時(shí)間觸發(fā)緩存

  檢查文件是否存在并且時(shí)間戳小于設(shè)置的過(guò)期時(shí)間,如果文件修改的時(shí)間戳比當(dāng)前時(shí)間戳減去過(guò)期時(shí)間戳大,那么就用緩存,否則更新緩存。

  內(nèi)容觸發(fā)緩存

  當(dāng)插入數(shù)據(jù)或更新數(shù)據(jù)時(shí),強(qiáng)制更新緩存。

  靜態(tài)緩存

  這里所說(shuō)的靜態(tài)緩存是指靜態(tài)化,直接生成HTML或xml等文本文件,有更新的時(shí)候重生成一次,適合于不太變化的頁(yè)面,這就不說(shuō)了。

  內(nèi)存緩存

  Memcached是高性能的,分布式的內(nèi)存對(duì)象緩存系統(tǒng),用于在動(dòng)態(tài)應(yīng)用中減少數(shù)據(jù)庫(kù)負(fù)載,提升訪問(wèn)速度。


  1.   <?php
  2.   $memcache = new Memcache;

  3.   $memcache->connect(‘localhost’, 11211) or die (“Could not connect”);

  4.   $version = $memcache->getVersion();

  5.   echo “Server’s version: “.$version.”\n”;

  6.   $tmp_object = new stdClass;

  7.   $tmp_object->str_attr = ‘test’;

  8.   $tmp_object->int_attr = 123;

  9.   $memcache->set(‘key’, $tmp_object, false, 10) or die (“Failed to save data at the server”);

  10.   echo “Store data in the cache (data will expire in 10 seconds)\n”;

  11.   $get_result = $memcache->get(‘key’);

  12.   echo “Data from the cache:\n”;

  13.   var_dump($get_result);

  14.   ?>
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  讀庫(kù)的例子:

  1.   <?php
  2.   $sql = ‘SELECT * FROM users’;

  3.   $key = md5($sql); //memcached 對(duì)象標(biāo)識(shí)符

  4.   if ( !($datas = $mc->get($key)) ) {

  5.   // 在 memcached 中未獲取到緩存數(shù)據(jù),則使用數(shù)據(jù)庫(kù)查詢獲取記錄集

  6.   echo “n”.str_pad(‘Read datas from MySQL.’, 60, ‘_’).”n”;

  7.   $conn = mysql_connect(‘localhost’, ‘test’, ‘test’);

  8.   mysql_select_db(‘test’);

  9.   $result = mysql_query($sql);

  10.   while ($row = mysql_fetch_object($result))

  11.   $datas[] = $row;

  12.   // 將數(shù)據(jù)庫(kù)中獲取到的結(jié)果集數(shù)據(jù)保存到 memcached 中,以供下次訪問(wèn)時(shí)使用

  13.   $mc->add($key, $datas);

  14.   } else {

  15.   echo “n”.str_pad(‘Read datas from memcached.’, 60, ‘_’).”n”;

  16.   }

  17.   var_dump($datas);

  18.   ?>
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  PHP的緩沖器

  比如eaccelerator,apc,phpa,xcache等等。

  MySQL緩存

  這也算非代碼級(jí)的,經(jīng)典的數(shù)據(jù)庫(kù)就是用的這種方式,看下面的運(yùn)行時(shí)間,0.09xxx之類的。
  1.   [client]

  2.   ……

  3.   default-character-set=gbk

  4.   default-storage-engine=MYISAM

  5.   max_connections=600

  6.   max_connect_errors=500

  7.   back_log=200

  8.   interactive_timeout=7200

  9.   query_cache_size=64M

  10.   ……

  11.   table_cache=512

  12.   ……

  13.   myisam_max_sort_file_size=100G

  14.   myisam_max_extra_sort_file_size=100G

  15.   myisam_sort_buffer_size=128M

  16.   key_buffer_size=1024M

  17.   read_buffer_size=512M

  18.   ……

  19.   thread_concurrency=8
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  基于反向代理的Web緩存
  1.   如Nginx,SQUID,mod_PRoxy(apache2以上又分為mod_proxy和mod_cache)

  2.   NGINX的例子:



  3.   #user nobody;

  4.   worker_processes 4;

  5.   error_log logs/error.log crit;

  6.   pid logs/nginx.pid;

  7.   worker_rlimit_nofile 10240;

  8.   events {

  9.   use epoll;

  10.   worker_connections 51200;

  11.   }

  12.   http {

  13.   include mime.types;

  14.   default_type application/octet-stream;

  15.   sendfile on;

  16.   keepalive_timeout 65;

  17.   tcp_nodelay on;

  18.   # server pool

  19.   upstream bspfrontsvr {

  20.   server 10.10.10.224:80 weight=1;

  21.   server 10.10.10.221:80 weight=1;

  22.   }

  23.   upstream bspimgsvr {

  24.   server 10.10.10.201:80 weight=1;

  25.   }

  26.   upstream bspstylesvr {

  27.   server 10.10.10.202:80 weight=1;

  28.   }

  29.   upstream bsphelpsvr {

  30.   server 10.10.10.204:80 weight=1;

  31.   }

  32.   upstream bspwsisvr {

  33.   server 10.10.10.203:80 weight=1;

  34.   }

  35.   upstream bspadminsvr {

  36.   server 10.10.10.222:80 weight=1;

  37.   }

  38.   upstream bspbuyersvr {

  39.   server 10.10.10.223:80 weight=1;

  40.   }

  41.   upstream bspsellersvr {

  42.   server 10.10.10.225:80 weight=1;

  43.   }

  44.   upstream bsploginsvr {

  45.   server 10.10.10.220:443 weight=1;

  46.   }

  47.   upstream bspregistersvr {

  48.   server 10.10.10.220:80 weight=1;

  49.   }

  50.   log_format test_com ‘$remote_addr – $remote_user [$time_local] “$request” ‘

  51.   ‘$status $body_bytes_sent “$http_referer” “$http_user_agent” ‘;

  52.   #——————————————————————–

  53.   #img.test.com

  54.   server {

  55.   listen 10.10.10.230:80;

  56.   server_name img.test.com;

  57.   location / {

  58.   proxy_pass http://bspimgsvr;

  59.   include proxy_setting.conf;

  60.   }

  61.   access_log logs/img.log test_com;

  62.   }

  63.   #style.test.com

  64.   server {

  65.   listen 10.10.10.230:80;

  66.   server_name style.test.com;

  67.   location / {

  68.   proxy_pass http://bspstylesvr;

  69.   include proxy_setting.conf;

  70.   }

  71.   access_log logs/style.log test_com;

  72.   }

  73.   #help.test.com

  74.   server {

  75.   listen 10.10.10.230:80;

  76.   server_name help.test.com;

  77.   location / {

  78.   proxy_pass http://bsphelpsvr;

  79.   include proxy_setting.conf;

  80.   }

  81.   access_log logs/help.log test_com;

  82.   }

  83.   #admin.test.com

  84.   server {

  85.   listen 10.10.10.230:80;

  86.   server_name admin.test.com;

  87.   location / {

  88.   proxy_pass http://bspadminsvr;

  89.   include proxy_setting.conf;

  90.   }

  91.   access_log logs/admin.log test_com;

  92.   }

  93.   #buyer.test.com

  94.   server {

  95.   listen 10.10.10.230:80;

  96.   server_name buyer.test.com;

  97.   location / {

  98.   proxy_pass http://bspbuyersvr;

  99.   include proxy_setting.conf;

  100.   }

  101.   access_log logs/buyer.log test_com;

  102.   }



  103.   #seller.test.com

  104.   server {

  105.   listen 10.10.10.230:80;

  106.   server_name seller.test.com;

  107.   location / {

  108.   proxy_pass http://bspsellersvr;

  109.   include proxy_setting.conf;

  110.   }

  111.   access_log logs/seller.log test_com;

  112.   }

  113.   #wsi.test.com

  114.   server {

  115.   listen 10.10.10.230:80;

  116.   server_name wsi.test.com;

  117.   location / {

  118.   proxy_pass http://bspwsisvr;

  119.   include proxy_setting.conf;

  120.   }

  121.   access_log logs/wsi.log test_com;

  122.   }

  123.   #www.test.com

  124.   server {

  125.   listen 10.10.10.230:80;

  126.   server_name www.test.com *.test.com;

  127.   location ~ ^/NginxStatus/ {

  128.   stub_status on;

  129.   access_log off;

  130.   }

  131.   location / {

  132.   proxy_pass http://bspfrontsvr;

  133.   include proxy_setting.conf;

  134.   }

  135.   access_log logs/www.log test_com;

  136.   error_page 500 502 503 504 /50x.html;

  137.   location = /50x.html {

  138.   root html;

  139.   }

  140.   }

  141.   #login.test.com

  142.   server {

  143.   listen 10.10.10.230:443;

  144.   server_name login.test.com;

  145.   ssl on;

  146.   ssl_certificate cert.pem;

  147.   ssl_certificate_key cert.key;

  148.   ssl_session_timeout 5m;

  149.   ssl_protocols SSLv2 SSLv3 TLSv1;

  150.   ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;

  151.   ssl_prefer_server_ciphers on;

  152.   location / {

  153.   proxy_pass https://bsploginsvr;

  154.   include proxy_setting.conf;

  155.   }

  156.   access_log logs/login.log test_com;

  157.   }

  158.   #login.test.com for register

  159.   server {

  160.   listen 10.10.10.230:80;

  161.   server_name login.test.com;

  162.   location / {

  163.   proxy_pass http://bspregistersvr;

  164.   include proxy_setting.conf;

  165.   }

  166.   access_log logs/register.log test_com;

  167.   }

  168.   }

  169.   

  170.   proxy_redirect off;

  171.   proxy_set_header Host $host;

  172.   proxy_set_header X-Real-IP $remote_addr;

  173.   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

  174.   client_max_body_size 10m;

  175.   client_body_buffer_size 128k;

  176.   proxy_connect_timeout 90;

  177.   proxy_send_timeout 90;

  178.   proxy_read_timeout 90;

  179.   proxy_buffer_size 4k;

  180.   proxy_buffers 4 32k;

  181.   proxy_busy_buffers_size 64k;

  182.   proxy_temp_file_write_size 64k;



  183.   mod_proxy的例子:



  184.   <VirtualHost *>

  185.   ServerName www.zxsv.com

  186.   ServerAdmin admin@zxsv.com

  187.   # reverse proxy setting

  188.   ProxyPass / http://www.zxsv.com:8080/

  189.   ProxyPassReverse / http://www.zxsv.com:8080/

  190.   # cache dir root

  191.   CacheRoot “/var/www/proxy”

  192.   # max cache storage

  193.   CacheSize 50000000

  194.   # hour: every 4 hour

  195.   CacheGcInterval 4

  196.   # max page expire time: hour

  197.   CacheMaxExpire 240

  198.   # Expire time = (now – last_modified) * CacheLastModifiedFactor

  199.   CacheLastModifiedFactor 0.1

  200.   # defalt expire tag: hour

  201.   CacheDefaultExpire 1

  202.   # force complete after precent of content retrived: 60-90%

  203.   CacheForceCompletion 80

  204.   CustomLog /usr/local/apache/logs/dev_access_log combined

  205.   </VirtualHost>
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作者: 夢(mèng)境照進(jìn)現(xiàn)實(shí)    時(shí)間: 2012-01-19 22:23
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