Memcache

A high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load

Features Very Fast APIs Hash Table LRU High Performance Slab Allocator

Very Fast

APIs

Hash Table

LRU

High Performance

Slab Allocator

Disadvantages Lacks Access Control Security

Lacks Access Control

Security

1.Installation #Download the extension module apt-get install php5-memcache # Edit /etc/php5/conf.d/memcache.ini and uncomment the following line by removing the semi-colon extension=memcache.so # Restart apache etc/init.d/apache2 restart

Implementation PHP: <? $memcache = new Memcache; $memcache->connect ( 'localhost', 11211 ) or die ( &quot;Could not connect&quot; ) ; ?>

PHP:

<?

$memcache = new Memcache;

$memcache->connect ( 'localhost', 11211 ) or die ( &quot;Could not connect&quot; ) ;

?>

Example: $sql = &quot;select * from pages where page_id=1&quot;; $qry = mysql_query ( $sql ) or die ( mysql_error () .&quot; : $sql&quot; ) ; $result = mysql_fetch_object ( $qry ) ; $content = $result->content;

Example:

$sql = &quot;select * from pages where page_id=1&quot;;

$qry = mysql_query ( $sql ) or die ( mysql_error () .&quot; : $sql&quot; ) ;

$result = mysql_fetch_object ( $qry ) ;

$content = $result->content;

$sql = &quot;select * from pages where page_id=1&quot;; $key = md5 ( 'query'.$sql ) ; $result = $memcache->get ( $key ) ; if ( $result == null) { $qry = mysql_query ( $sql ) or die ( mysql_error () .&quot; : $sql&quot; ) ; if ( mysql_num_rows ( $qry ) > 0 ) { $result = mysql_fetch_object ( $qry ) ; $memcache->set ( $key,$result,0,3600 ) ; } }

$sql = &quot;select * from pages where page_id=1&quot;;

$key = md5 ( 'query'.$sql ) ;

$result = $memcache->get ( $key ) ;

if ( $result == null) {

$qry = mysql_query ( $sql ) or die ( mysql_error () .&quot; : $sql&quot; ) ;

if ( mysql_num_rows ( $qry ) > 0 ) {

$result = mysql_fetch_object ( $qry ) ;

$memcache->set ( $key,$result,0,3600 ) ;

}

}

Functions Memcache::add Memcache::get Memcache::connect Memcache::delete Memcache::addServer Memcache::close

Memcache::add

Memcache::get

Memcache::connect

Memcache::delete

Memcache::addServer

Memcache::close

Memcache::add <?php $memcache_obj = memcache_connect(&quot;localhost&quot;, 11211); $memcache_obj->add('var_key', 'test variable', false, 30); ?>

Memcache::connect <?php $memcache = new Memcache; $memcache->connect('memcache_host', 11211); ?>

Memcache::delete <?php $memcache_obj = new Memcache; $memcache_obj->connect('memcache_host', 11211); $memcache_obj->delete('key_to_delete', 10); ?>

Memcache::get <?php $memcache_obj = new Memcache; $memcache_obj->connect('memcache_host', 11211); $var = $memcache_obj->get('some_key'); ?>

References: http://in.php.net/memcache http://phpbuilder.com/manual/en/intro.memcache.php http://www.hostingcoupons.org/what-is-memcached/

Thank You…