Index: kernel/utility/cache.php
===================================================================
--- kernel/utility/cache.php	(revision 13986)
+++ kernel/utility/cache.php	(working copy)
@@ -62,10 +62,28 @@
 		 */
 		var $displayCacheStatistics = false;
 
+		/**
+		 * Site key name
+		 * Prepended to each cached key name
+		 *
+		 * @var string
+		 */
+		var $siteKeyName = '';
+
+		/**
+		 * Site key value
+		 * Prepended to each cached key name
+		 *
+		 * @var string
+		 */
+		var $siteKeyValue = null;
+
 		function kCache()
 		{
 			parent::kBase();
 
+			$this->siteKeyName = 'site_serial:' . crc32(SQL_TYPE . '://' . SQL_USER . ':' . SQL_PASS . '@' . SQL_SERVER . ':' . TABLE_PREFIX);
+
 			// get cache handler class to use
 			if (array_key_exists('CacheHandler', $GLOBALS['vars']) && $GLOBALS['vars']['CacheHandler']) {
 				// for advanced users, who want to save one SQL on each page load
@@ -239,21 +257,20 @@
 		 */
 		function _cachePrefix($only_site_key_name = false)
 		{
-			// don't use SERVER_NAME here, because it may be cron, or command line request also
-			$site_key = 'site_serial:' . crc32(FULL_PATH);
-
 			if ($only_site_key_name) {
-				return $site_key;
+				return $this->siteKeyName;
 			}
 
-			$site_serial = $this->_handler->get($site_key);
+			if ( !isset($this->siteKeyValue) ) {
+				$this->siteKeyValue = $this->_handler->get($this->siteKeyName);
 
-			if (!$site_serial) {
-				$site_serial = 1;
-				$this->_handler->set($site_key, $site_serial);
+				if (!$this->siteKeyValue) {
+					$this->siteKeyValue = 1;
+					$this->_handler->set($this->siteKeyName, $this->siteKeyValue);
+				}
 			}
 
-			return "$site_key:$site_serial:";
+			return "{$this->siteKeyName}:{$this->siteKeyValue}:";
 		}
 
 		function setStatistics($name, $found)