Memcache
- 1. Memcache
- 2. 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
- 3. Features Very Fast APIs Hash Table LRU High Performance Slab Allocator
- 4. Disadvantages Lacks Access Control Security
- 5. 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
- 6. Implementation PHP: <? $memcache = new Memcache; $memcache->connect ( 'localhost', 11211 ) or die ( "Could not connect" ) ; ?>
- 7. Example: $sql = "select * from pages where page_id=1"; $qry = mysql_query ( $sql ) or die ( mysql_error () ." : $sql" ) ; $result = mysql_fetch_object ( $qry ) ; $content = $result->content;
- 8. $sql = "select * from pages where page_id=1"; $key = md5 ( 'query'.$sql ) ; $result = $memcache->get ( $key ) ; if ( $result == null) { $qry = mysql_query ( $sql ) or die ( mysql_error () ." : $sql" ) ; if ( mysql_num_rows ( $qry ) > 0 ) { $result = mysql_fetch_object ( $qry ) ; $memcache->set ( $key,$result,0,3600 ) ; } }
- 9. Functions Memcache::add Memcache::get Memcache::connect Memcache::delete Memcache::addServer Memcache::close
- 10. Memcache::add <?php $memcache_obj = memcache_connect("localhost", 11211); $memcache_obj->add('var_key', 'test variable', false, 30); ?>
- 11. Memcache::connect <?php $memcache = new Memcache; $memcache->connect('memcache_host', 11211); ?>
- 12. Memcache::delete <?php $memcache_obj = new Memcache; $memcache_obj->connect('memcache_host', 11211); $memcache_obj->delete('key_to_delete', 10); ?>
- 13. Memcache::get <?php $memcache_obj = new Memcache; $memcache_obj->connect('memcache_host', 11211); $var = $memcache_obj->get('some_key'); ?>
- 14. References: http://in.php.net/memcache http://phpbuilder.com/manual/en/intro.memcache.php http://www.hostingcoupons.org/what-is-memcached/
- 15. Thank You…