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標(biāo)題:
PHP企業(yè)級(jí)應(yīng)用緩存技術(shù)詳解
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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。
<?php
$memcache = new Memcache;
$memcache->connect(‘localhost’, 11211) or die (“Could not connect”);
$version = $memcache->getVersion();
echo “Server’s version: “.$version.”\n”;
$tmp_object = new stdClass;
$tmp_object->str_attr = ‘test’;
$tmp_object->int_attr = 123;
$memcache->set(‘key’, $tmp_object, false, 10) or die (“Failed to save data at the server”);
echo “Store data in the cache (data will expire in 10 seconds)\n”;
$get_result = $memcache->get(‘key’);
echo “Data from the cache:\n”;
var_dump($get_result);
?>
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讀庫(kù)的例子:
<?php
$sql = ‘SELECT * FROM users’;
$key = md5($sql); //memcached 對(duì)象標(biāo)識(shí)符
if ( !($datas = $mc->get($key)) ) {
// 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
echo “n”.str_pad(‘Read datas from MySQL.’, 60, ‘_’).”n”;
$conn = mysql_connect(‘localhost’, ‘test’, ‘test’);
mysql_select_db(‘test’);
$result = mysql_query($sql);
while ($row = mysql_fetch_object($result))
$datas[] = $row;
// 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
$mc->add($key, $datas);
} else {
echo “n”.str_pad(‘Read datas from memcached.’, 60, ‘_’).”n”;
}
var_dump($datas);
?>
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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。
[client]
……
default-character-set=gbk
default-storage-engine=MYISAM
max_connections=600
max_connect_errors=500
back_log=200
interactive_timeout=7200
query_cache_size=64M
……
table_cache=512
……
myisam_max_sort_file_size=100G
myisam_max_extra_sort_file_size=100G
myisam_sort_buffer_size=128M
key_buffer_size=1024M
read_buffer_size=512M
……
thread_concurrency=8
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基于反向代理的Web緩存
如Nginx,SQUID,mod_PRoxy(apache2以上又分為mod_proxy和mod_cache)
NGINX的例子:
#user nobody;
worker_processes 4;
error_log logs/error.log crit;
pid logs/nginx.pid;
worker_rlimit_nofile 10240;
events {
use epoll;
worker_connections 51200;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
tcp_nodelay on;
# server pool
upstream bspfrontsvr {
server 10.10.10.224:80 weight=1;
server 10.10.10.221:80 weight=1;
}
upstream bspimgsvr {
server 10.10.10.201:80 weight=1;
}
upstream bspstylesvr {
server 10.10.10.202:80 weight=1;
}
upstream bsphelpsvr {
server 10.10.10.204:80 weight=1;
}
upstream bspwsisvr {
server 10.10.10.203:80 weight=1;
}
upstream bspadminsvr {
server 10.10.10.222:80 weight=1;
}
upstream bspbuyersvr {
server 10.10.10.223:80 weight=1;
}
upstream bspsellersvr {
server 10.10.10.225:80 weight=1;
}
upstream bsploginsvr {
server 10.10.10.220:443 weight=1;
}
upstream bspregistersvr {
server 10.10.10.220:80 weight=1;
}
log_format test_com ‘$remote_addr – $remote_user [$time_local] “$request” ‘
‘$status $body_bytes_sent “$http_referer” “$http_user_agent” ‘;
#——————————————————————–
#img.test.com
server {
listen 10.10.10.230:80;
server_name img.test.com;
location / {
proxy_pass http://bspimgsvr;
include proxy_setting.conf;
}
access_log logs/img.log test_com;
}
#style.test.com
server {
listen 10.10.10.230:80;
server_name style.test.com;
location / {
proxy_pass http://bspstylesvr;
include proxy_setting.conf;
}
access_log logs/style.log test_com;
}
#help.test.com
server {
listen 10.10.10.230:80;
server_name help.test.com;
location / {
proxy_pass http://bsphelpsvr;
include proxy_setting.conf;
}
access_log logs/help.log test_com;
}
#admin.test.com
server {
listen 10.10.10.230:80;
server_name admin.test.com;
location / {
proxy_pass http://bspadminsvr;
include proxy_setting.conf;
}
access_log logs/admin.log test_com;
}
#buyer.test.com
server {
listen 10.10.10.230:80;
server_name buyer.test.com;
location / {
proxy_pass http://bspbuyersvr;
include proxy_setting.conf;
}
access_log logs/buyer.log test_com;
}
#seller.test.com
server {
listen 10.10.10.230:80;
server_name seller.test.com;
location / {
proxy_pass http://bspsellersvr;
include proxy_setting.conf;
}
access_log logs/seller.log test_com;
}
#wsi.test.com
server {
listen 10.10.10.230:80;
server_name wsi.test.com;
location / {
proxy_pass http://bspwsisvr;
include proxy_setting.conf;
}
access_log logs/wsi.log test_com;
}
#www.test.com
server {
listen 10.10.10.230:80;
server_name www.test.com *.test.com;
location ~ ^/NginxStatus/ {
stub_status on;
access_log off;
}
location / {
proxy_pass http://bspfrontsvr;
include proxy_setting.conf;
}
access_log logs/www.log test_com;
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
#login.test.com
server {
listen 10.10.10.230:443;
server_name login.test.com;
ssl on;
ssl_certificate cert.pem;
ssl_certificate_key cert.key;
ssl_session_timeout 5m;
ssl_protocols SSLv2 SSLv3 TLSv1;
ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
ssl_prefer_server_ciphers on;
location / {
proxy_pass https://bsploginsvr;
include proxy_setting.conf;
}
access_log logs/login.log test_com;
}
#login.test.com for register
server {
listen 10.10.10.230:80;
server_name login.test.com;
location / {
proxy_pass http://bspregistersvr;
include proxy_setting.conf;
}
access_log logs/register.log test_com;
}
}
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
client_max_body_size 10m;
client_body_buffer_size 128k;
proxy_connect_timeout 90;
proxy_send_timeout 90;
proxy_read_timeout 90;
proxy_buffer_size 4k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;
mod_proxy的例子:
<VirtualHost *>
ServerName www.zxsv.com
ServerAdmin admin@zxsv.com
# reverse proxy setting
ProxyPass / http://www.zxsv.com:8080/
ProxyPassReverse / http://www.zxsv.com:8080/
# cache dir root
CacheRoot “/var/www/proxy”
# max cache storage
CacheSize 50000000
# hour: every 4 hour
CacheGcInterval 4
# max page expire time: hour
CacheMaxExpire 240
# Expire time = (now – last_modified) * CacheLastModifiedFactor
CacheLastModifiedFactor 0.1
# defalt expire tag: hour
CacheDefaultExpire 1
# force complete after precent of content retrived: 60-90%
CacheForceCompletion 80
CustomLog /usr/local/apache/logs/dev_access_log combined
</VirtualHost>
復(fù)制代碼
作者:
夢(mèng)境照進(jìn)現(xiàn)實(shí)
時(shí)間:
2012-01-19 22:23
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