diff --git a/classes/cache/CacheApc.class.php b/classes/cache/CacheApc.class.php
index 315dc41c5..4131b5074 100644
--- a/classes/cache/CacheApc.class.php
+++ b/classes/cache/CacheApc.class.php
@@ -62,7 +62,7 @@
 		}
 
 		function delete($key) {
-			$this->_delete(md5(_XE_PATH_.$key));
+			$this->_delete($key);
 		}
 
 		function truncate() {
diff --git a/modules/admin/admin.admin.controller.php b/modules/admin/admin.admin.controller.php
index 6e6b4d857..1828d9372 100644
--- a/modules/admin/admin.admin.controller.php
+++ b/modules/admin/admin.admin.controller.php
@@ -51,7 +51,7 @@
 			}
 
 			$truncated = array();
-			$oObjectCacheHandler = &CacheHandler::getInstance();
+			$oObjectCacheHandler = &CacheHandler::getInstance('object');
 			$oTemplateCacheHandler = &CacheHandler::getInstance('template');
 
 			if($oObjectCacheHandler->isSupport()){
diff --git a/modules/comment/comment.admin.controller.php b/modules/comment/comment.admin.controller.php
index 7d0e28ced..87dc2b691 100644
--- a/modules/comment/comment.admin.controller.php
+++ b/modules/comment/comment.admin.controller.php
@@ -78,6 +78,18 @@
 			}
 
 			$oDB->commit();
+			
+			//remove from cache
+            $oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()) 
+            {
+            	$cache_object = $oCacheHandler->get('comment_list_document_pages');
+            	foreach ($cache_object as $object){
+            		$cache_key = $object;
+                	$oCacheHandler->delete($cache_key);
+            	}
+                $oCacheHandler->delete('comment_list_document_pages');
+            }
 
             $this->setMessage( sprintf(Context::getLang('msg_checked_comment_is_deleted'), $deleted_count) );
 
@@ -158,6 +170,17 @@
             if(!$output->toBool()) return $output;
 
             $output = executeQuery('comment.deleteModuleCommentsList', $args);
+			//remove from cache
+            $oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()) 
+            {
+            	$cache_object = $oCacheHandler->get('comment_list_document_pages');
+            	foreach ($cache_object as $object){
+            		$cache_key = $object;
+                	$oCacheHandler->delete($cache_key);
+            	}
+                $oCacheHandler->delete('comment_list_document_pages');
+            }
             return $output;
         }
 
diff --git a/modules/comment/comment.controller.php b/modules/comment/comment.controller.php
index aa6266c8b..51ec44699 100644
--- a/modules/comment/comment.controller.php
+++ b/modules/comment/comment.controller.php
@@ -240,6 +240,17 @@
 
 
             $output->add('comment_srl', $obj->comment_srl);
+			//remove from cache
+            $oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()) 
+            {
+            	$cache_object = $oCacheHandler->get('comment_list_document_pages');
+            	foreach ($cache_object as $object){
+            		$cache_key = $object;
+                	$oCacheHandler->delete($cache_key);
+            	}
+                $oCacheHandler->delete('comment_list_document_pages');
+            }
             return $output;
         }
 
@@ -316,6 +327,17 @@
             $oDB->commit();
 
             $output->add('comment_srl', $obj->comment_srl);
+			//remove from cache
+            $oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()) 
+            {
+            	$cache_object = $oCacheHandler->get('comment_list_document_pages');
+            	foreach ($cache_object as $object){
+            		$cache_key = $object;
+                	$oCacheHandler->delete($cache_key);
+            	}
+                $oCacheHandler->delete('comment_list_document_pages');
+            }
             return $output;
         }
 
@@ -379,6 +401,17 @@
             $oDB->commit();
 
             $output->add('document_srl', $document_srl);
+			//remove from cache
+            $oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()) 
+            {
+            	$cache_object = $oCacheHandler->get('comment_list_document_pages');
+            	foreach ($cache_object as $object){
+            		$cache_key = $object;
+                	$oCacheHandler->delete($cache_key);
+            	}
+                $oCacheHandler->delete('comment_list_document_pages');
+            }
             return $output;
         }
 
@@ -431,6 +464,17 @@
 				$this->_deleteDeclaredComments($args);
 				$this->_deleteVotedComments($args);
 			}
+			//remove from cache
+            $oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()) 
+            {
+            	$cache_object = $oCacheHandler->get('comment_list_document_pages');
+            	foreach ($cache_object as $object){
+            		$cache_key = $object;
+                	$oCacheHandler->delete($cache_key);
+            	}
+                $oCacheHandler->delete('comment_list_document_pages');
+            }
 
             return $output;
         }
diff --git a/modules/comment/comment.model.php b/modules/comment/comment.model.php
index 2b74bad8c..59dbd3f55 100644
--- a/modules/comment/comment.model.php
+++ b/modules/comment/comment.model.php
@@ -200,41 +200,63 @@
          * @brief get a comment list of the doc in corresponding woth document_srl.
          **/
         function getCommentList($document_srl, $page = 0, $is_admin = false, $count = 0) {
-            // get the number of comments on the document module
-            $oDocumentModel = &getModel('document');
-			$columnList = array('document_srl', 'module_srl', 'comment_count');
-            $oDocument = $oDocumentModel->getDocument($document_srl, false, true, $columnList);
-            // return if no doc exists.
-            if(!$oDocument->isExists()) return;
-            // return if no comment exists
-            if($oDocument->getCommentCount()<1) return;
-            // get a list of comments
-            $module_srl = $oDocument->get('module_srl');
-
-            if(!$count) {
-                $comment_config = $this->getCommentConfig($module_srl);
-                $comment_count = $comment_config->comment_count;
-                if(!$comment_count) $comment_count = 50;
-            } else {
-                $comment_count = $count;
-            }
-            // get a very last page if no page exists
-            if(!$page) $page = (int)( ($oDocument->getCommentCount()-1) / $comment_count) + 1;                
-            // get a list of comments
-            $args->document_srl = $document_srl;
-            $args->list_count = $comment_count;
-            $args->page = $page;
-            $args->page_count = 10;
-            $output = executeQueryArray('comment.getCommentPageList', $args);
-            // return if an error occurs in the query results
-            if(!$output->toBool()) return;
-            // insert data into CommentPageList table if the number of results is different from stored comments
-            if(!$output->data) {
-                $this->fixCommentList($oDocument->get('module_srl'), $document_srl);
-                $output = executeQueryArray('comment.getCommentPageList', $args);
-                if(!$output->toBool()) return;
-            }
-
+        	// cache controll
+			$oCacheHandler = &CacheHandler::getInstance('object');
+			if($oCacheHandler->isSupport()){
+				$cache_key = 'object:'.$document_srl.'_'.$page;
+				$output = $oCacheHandler->get($cache_key);
+				$cache_object = $oCacheHandler->get('comment_list_document_pages');
+				if($cache_object) {
+					if(!in_array($cache_key, $cache_object)) {
+						$cache_object[]=$cache_key;
+						$oCacheHandler->put('comment_list_document_pages',$cache_object);
+					}
+				} else {
+					$cache_object = array();
+					$cache_object[] = $cache_key;
+					$oCacheHandler->put('comment_list_document_pages',$cache_object);
+				}
+			}
+        	if(!$output){
+        		// get the number of comments on the document module
+	            $oDocumentModel = &getModel('document');
+				$columnList = array('document_srl', 'module_srl', 'comment_count');
+	            $oDocument = $oDocumentModel->getDocument($document_srl, false, true, $columnList);
+	            // return if no doc exists.
+	            if(!$oDocument->isExists()) return;
+	            // return if no comment exists
+	            if($oDocument->getCommentCount()<1) return;
+	            // get a list of comments
+	            $module_srl = $oDocument->get('module_srl');
+	
+	            if(!$count) {
+	                $comment_config = $this->getCommentConfig($module_srl);
+	                $comment_count = $comment_config->comment_count;
+	                if(!$comment_count) $comment_count = 50;
+	            } else {
+	                $comment_count = $count;
+	            }
+	            // get a very last page if no page exists
+	            if(!$page) $page = (int)( ($oDocument->getCommentCount()-1) / $comment_count) + 1;                
+	            // get a list of comments
+	            $args->document_srl = $document_srl;
+	            $args->list_count = $comment_count;
+	            $args->page = $page;
+	            $args->page_count = 10;
+	            $output = executeQueryArray('comment.getCommentPageList', $args);
+	            // return if an error occurs in the query results
+	            if(!$output->toBool()) return;
+	            // insert data into CommentPageList table if the number of results is different from stored comments
+	            if(!$output->data) {
+	                $this->fixCommentList($oDocument->get('module_srl'), $document_srl);
+	                $output = executeQueryArray('comment.getCommentPageList', $args);
+	                if(!$output->toBool()) return;
+	            }
+	            //insert in cache
+	            if($oCacheHandler->isSupport()) $oCacheHandler->put($cache_key,$output);
+        		
+        	}
+        	
             return $output;
         }
             
diff --git a/modules/document/document.admin.controller.php b/modules/document/document.admin.controller.php
index 9341b7198..a9bf85443 100644
--- a/modules/document/document.admin.controller.php
+++ b/modules/document/document.admin.controller.php
@@ -149,6 +149,22 @@
             }
             
             $oDB->commit();
+			//remove from cache
+	        $oCacheHandler = &CacheHandler::getInstance('object');
+	        if($oCacheHandler->isSupport()) 
+	        {
+	        	foreach($document_srl_list as $document_srl)
+	        	{
+	        		$cache_key = 'object:'.$document_srl;
+	            	$oCacheHandler->delete($cache_key);
+	        	}
+	            $cache_object = $oCacheHandler->get('module_list_documents');
+	            foreach ($cache_object as $object){
+	            	$cache_key_object = $object;
+	                $oCacheHandler->delete($cache_key_object);
+	            }
+	            $oCacheHandler->delete('module_list_documents');
+	        }
             return new Object();
         }
 
@@ -266,7 +282,30 @@
          **/
         function deleteModuleDocument($module_srl) {
             $args->module_srl = $module_srl;
+			$oDocumentModel = &getModel('document');
+            $args->module_srl = $module_srl;
+            $document_list = $oDocumentModel->getDocumentList($args);
+            $documents = $document_list->data;
             $output = executeQuery('document.deleteModuleDocument', $args);
+			foreach ($documents as $oDocument){
+            	$document_srl_list[] = $oDocument->document_srl;
+            }
+			//remove from cache
+	        $oCacheHandler = &CacheHandler::getInstance('object');
+	        if($oCacheHandler->isSupport()) 
+	        {
+	        	foreach($document_srl_list as $document_srl)
+	        	{
+	        		$cache_key = 'object:'.$document_srl;
+	            	$oCacheHandler->delete($cache_key);
+	        	}
+	            $cache_object = $oCacheHandler->get('module_list_documents');
+	            foreach ($cache_object as $object){
+	            	$cache_key_object = $object;
+	                $oCacheHandler->delete($cache_key_object);
+	            }
+	            $oCacheHandler->delete('module_list_documents');
+	        }
             return $output;
         }
 
diff --git a/modules/document/document.controller.php b/modules/document/document.controller.php
index 2c98982cf..6e248ed99 100644
--- a/modules/document/document.controller.php
+++ b/modules/document/document.controller.php
@@ -237,6 +237,20 @@ class documentController extends document {
 		$this->addGrant($obj->document_srl);
 		$output->add('document_srl',$obj->document_srl);
 		$output->add('category_srl',$obj->category_srl);
+		//remove from cache
+        $oCacheHandler = &CacheHandler::getInstance('object');
+        if($oCacheHandler->isSupport()) 
+        {
+            $cache_key = 'object:'.$obj->document_srl;
+            $oCacheHandler->delete($cache_key);
+            $cache_object = $oCacheHandler->get('module_list_documents');
+            foreach ($cache_object as $object){
+            	$cache_key_object = $object;
+                $oCacheHandler->delete($cache_key_object);
+            }
+            $oCacheHandler->delete('module_list_documents');
+        }
+
 		return $output;
 	}
 
@@ -390,6 +404,20 @@ class documentController extends document {
 		FileHandler::removeDir(sprintf('files/cache/thumbnails/%s',getNumberingPath($obj->document_srl, 3)));
 
 		$output->add('document_srl',$obj->document_srl);
+		//remove from cache
+        $oCacheHandler = &CacheHandler::getInstance('object');
+        if($oCacheHandler->isSupport()) 
+        {
+            $cache_key = 'object:'.$obj->document_srl;
+            $oCacheHandler->delete($cache_key);
+            $cache_object = $oCacheHandler->get('module_list_documents');
+            foreach ($cache_object as $object){
+            	$cache_key_object = $object;
+                $oCacheHandler->delete($cache_key_object);
+            }
+            $oCacheHandler->delete('module_list_documents');
+        }
+		
 		return $output;
 	}
 
@@ -460,6 +488,20 @@ class documentController extends document {
 		// commit
 		$oDB->commit();
 
+		//remove from cache
+        $oCacheHandler = &CacheHandler::getInstance('object');
+        if($oCacheHandler->isSupport()) 
+        {
+            $cache_key = 'object:'.$document_srl;
+            $oCacheHandler->delete($cache_key);
+            $cache_object = $oCacheHandler->get('module_list_documents');
+            foreach ($cache_object as $object){
+            	$cache_key_object = $object;
+                $oCacheHandler->delete($cache_key_object);
+            }
+            $oCacheHandler->delete('module_list_documents');
+        }
+
 		return $output;
 	}
 
diff --git a/modules/document/document.model.php b/modules/document/document.model.php
index e3edbc7bc..59f5f4f98 100644
--- a/modules/document/document.model.php
+++ b/modules/document/document.model.php
@@ -152,204 +152,226 @@
          * @brief module_srl value, bringing the list of documents
          **/
         function getDocumentList($obj, $except_notice = false, $load_extra_vars=true, $columnList = array()) {
-            $logged_info = Context::get('logged_info');
-			$sort_check = $this->_setSortIndex($obj, $load_extra_vars);
-
-			$obj->sort_index = $sort_check->sort_index;
-			// Check the target and sequence alignment
-            if(!in_array($obj->order_type, array('desc','asc'))) $obj->order_type = 'asc';
-            // If that came across mid module_srl instead of a direct module_srl guhaejum
-            if($obj->mid) {
-                $oModuleModel = &getModel('module');
-                $obj->module_srl = $oModuleModel->getModuleSrlByMid($obj->mid);
-                unset($obj->mid);
-            }
-            // Module_srl passed the array may be a check whether the array
-            if(is_array($obj->module_srl)) $args->module_srl = implode(',', $obj->module_srl);
-            else $args->module_srl = $obj->module_srl;
-            // Except for the test module_srl
-            if(is_array($obj->exclude_module_srl)) $args->exclude_module_srl = implode(',', $obj->exclude_module_srl);
-            else $args->exclude_module_srl = $obj->exclude_module_srl;
-            // Variable check
-            $args->category_srl = $obj->category_srl?$obj->category_srl:null;
-            $args->sort_index = $obj->sort_index;
-            $args->order_type = $obj->order_type;
-            $args->page = $obj->page?$obj->page:1;
-            $args->list_count = $obj->list_count?$obj->list_count:20;
-            $args->page_count = $obj->page_count?$obj->page_count:10;
-            $args->start_date = $obj->start_date?$obj->start_date:null;
-            $args->end_date = $obj->end_date?$obj->end_date:null;
-            $args->member_srl = $obj->member_srl;
-			$args->statusList = $obj->statusList?$obj->statusList:array($this->getConfigStatus('secret'), $this->getConfigStatus('public'));
-			if($logged_info->is_admin == 'Y') $args->statusList = array($this->getConfigStatus('secret'), $this->getConfigStatus('public'));
-            // Category is selected, further sub-categories until all conditions
-            if($args->category_srl) {
-                $category_list = $this->getCategoryList($args->module_srl);
-                $category_info = $category_list[$args->category_srl];
-                $category_info->childs[] = $args->category_srl;
-                $args->category_srl = implode(',',$category_info->childs);
-            }
-            // Used to specify the default query id (based on several search options to query id modified)
-            $query_id = 'document.getDocumentList';
-            // If the search by specifying the document division naeyonggeomsaekil processed for
-            $use_division = false;
-
-            // Search options
-            $searchOpt->search_target = $obj->search_target;
-            $searchOpt->search_keyword = $obj->search_keyword;
-			$this->_setSearchOption($searchOpt, $args, $query_id, $use_division);
-
-			if ($sort_check->isExtraVars)
-			{
-				$query_id = 'document.getDocumentListExtraSort';
-				$output = executeQueryArray($query_id, $args);
-			}
-			else
-			{
-				/**
-				 * list_order asc sort of division that can be used only when
-				 **/
-				if($args->sort_index != 'list_order' || $args->order_type != 'asc') $use_division = false;
-
-				/**
-				 * If it is true, use_division changed to use the document division
-				 **/
-				if($use_division) {
-					// Division begins
-					$division = (int)Context::get('division');
-
-					// order by list_order and (module_srl===0 or module_srl many count), therefore case table full scan
-					if($args->sort_index == 'list_order' && ($args->exclude_module_srl === 0 || count($args->module_srl) > 10))
-					{
-						$listSqlID = 'document.getDocumentListUseIndex';
-						$divisionSqlID = 'document.getDocumentDivisionUseIndex';
+            // cache controll
+			$oCacheHandler = &CacheHandler::getInstance('object');
+			if($oCacheHandler->isSupport()){
+				$cache_key = 'object:'.$obj->module_srl.'_category_srl:'.$obj->category_srl.'_list_count:'.$obj->list_count.'_search_target:'.$obj->search_target.'_search_keyword:'.$obj->search_keyword.'_documents';
+				$output = $oCacheHandler->get($cache_key);
+				$cache_object = $oCacheHandler->get('module_list_documents');
+				if($cache_object) {
+					if(!in_array($cache_key, $cache_object)) {
+						$cache_object[]=$cache_key;
+						$oCacheHandler->put('module_list_documents',$cache_object);
 					}
-					else
-					{
-						$listSqlID = 'document.getDocumentList';
-						$divisionSqlID = 'document.getDocumentDivision';
-					}
-
-					// If you do not value the best division top
-					if(!$division) {
-						$division_args->module_srl = $args->module_srl;
-						$division_args->exclude_module_srl = $args->exclude_module_srl;
-						$division_args->list_count = 1;
-						$division_args->sort_index = $args->sort_index;
-						$division_args->order_type = $args->order_type;
-						$division_args->statusList = $args->statusList;
-						$output = executeQuery($listSqlID, $division_args, $columnList);
-						if($output->data) {
-							$item = array_pop($output->data);
-							$division = $item->list_order;
-						}
-						$division_args = null;
-					}
-					// The last division
-					$last_division = (int)Context::get('last_division');
-					// Division after division from the 5000 value of the specified Wanted
-					if(!$last_division) {
-						$last_division_args->module_srl = $args->module_srl;
-						$last_division_args->exclude_module_srl = $args->exclude_module_srl;
-						$last_division_args->list_count = 1;
-						$last_division_args->sort_index = $args->sort_index;
-						$last_division_args->order_type = $args->order_type;
-						$last_division_args->list_order = $division;
-						$last_division_args->page = 5001;
-						$output = executeQuery($divisionSqlID, $last_division_args, $columnList);
-						if($output->data) {
-							$item = array_pop($output->data);
-							$last_division = $item->list_order;
-						}
-					}
-					// Make sure that after last_division article
-					if($last_division) {
-						$last_division_args = null;
-						$last_division_args->module_srl = $args->module_srl;
-						$last_division_args->exclude_module_srl = $args->exclude_module_srl;
-						$last_division_args->list_order = $last_division;
-						$output = executeQuery("document.getDocumentDivisionCount", $last_division_args);
-						if($output->data->count<1) $last_division = null;
-					}
-
-					$args->division = $division;
-					$args->last_division = $last_division;
-					Context::set('division', $division);
-					Context::set('last_division', $last_division);
-				}
-				// document.getDocumentList query execution
-				// Query_id if you have a group by clause getDocumentListWithinTag getDocumentListWithinComment or used again to perform the query because
-				if(in_array($query_id, array('document.getDocumentListWithinComment', 'document.getDocumentListWithinTag'))) {
-					$group_args = clone($args);
-					$group_args->sort_index = 'documents.'.$args->sort_index;
-					$output = executeQueryArray($query_id, $group_args);
-					if(!$output->toBool()||!count($output->data)) return $output;
-
-					foreach($output->data as $key => $val) {
-						if($val->document_srl) $target_srls[] = $val->document_srl;
-					}
-
-					$page_navigation = $output->page_navigation;
-					$keys = array_keys($output->data);
-					$virtual_number = $keys[0];
-
-					$target_args->document_srls = implode(',',$target_srls);
-					$target_args->list_order = $args->sort_index;
-					$target_args->order_type = $args->order_type;
-					$target_args->list_count = $args->list_count;
-					$target_args->page = 1;
-					$output = executeQueryArray('document.getDocuments', $target_args);
-					$output->page_navigation = $page_navigation;
-					$output->total_count = $page_navigation->total_count;
-					$output->total_page = $page_navigation->total_page;
-					$output->page = $page_navigation->cur_page;
 				} else {
-					$output = executeQueryArray($query_id, $args, $columnList);
+					$cache_object = array();
+					$cache_object[] = $cache_key;
+					$oCacheHandler->put('module_list_documents',$cache_object);
 				}
-			} 
-			// Return if no result or an error occurs
-			if(!$output->toBool()||!count($output->data)) return $output;
-
-			$idx = 0;
-			$data = $output->data;
-			unset($output->data);
-
-			if(!isset($virtual_number))
-			{
-				$keys = array_keys($data);
-				$virtual_number = $keys[0];
 			}
+        	if(!$output){
+			
+				$logged_info = Context::get('logged_info');
+				$sort_check = $this->_setSortIndex($obj, $load_extra_vars);
+
+				$obj->sort_index = $sort_check->sort_index;
+				// Check the target and sequence alignment
+				if(!in_array($obj->order_type, array('desc','asc'))) $obj->order_type = 'asc';
+				// If that came across mid module_srl instead of a direct module_srl guhaejum
+				if($obj->mid) {
+					$oModuleModel = &getModel('module');
+					$obj->module_srl = $oModuleModel->getModuleSrlByMid($obj->mid);
+					unset($obj->mid);
+				}
+				// Module_srl passed the array may be a check whether the array
+				if(is_array($obj->module_srl)) $args->module_srl = implode(',', $obj->module_srl);
+				else $args->module_srl = $obj->module_srl;
+				// Except for the test module_srl
+				if(is_array($obj->exclude_module_srl)) $args->exclude_module_srl = implode(',', $obj->exclude_module_srl);
+				else $args->exclude_module_srl = $obj->exclude_module_srl;
+				// Variable check
+				$args->category_srl = $obj->category_srl?$obj->category_srl:null;
+				$args->sort_index = $obj->sort_index;
+				$args->order_type = $obj->order_type;
+				$args->page = $obj->page?$obj->page:1;
+				$args->list_count = $obj->list_count?$obj->list_count:20;
+				$args->page_count = $obj->page_count?$obj->page_count:10;
+				$args->start_date = $obj->start_date?$obj->start_date:null;
+				$args->end_date = $obj->end_date?$obj->end_date:null;
+				$args->member_srl = $obj->member_srl;
+				$args->statusList = $obj->statusList?$obj->statusList:array($this->getConfigStatus('secret'), $this->getConfigStatus('public'));
+				if($logged_info->is_admin == 'Y') $args->statusList = array($this->getConfigStatus('secret'), $this->getConfigStatus('public'));
+				// Category is selected, further sub-categories until all conditions
+				if($args->category_srl) {
+					$category_list = $this->getCategoryList($args->module_srl);
+					$category_info = $category_list[$args->category_srl];
+					$category_info->childs[] = $args->category_srl;
+					$args->category_srl = implode(',',$category_info->childs);
+				}
+				// Used to specify the default query id (based on several search options to query id modified)
+				$query_id = 'document.getDocumentList';
+				// If the search by specifying the document division naeyonggeomsaekil processed for
+				$use_division = false;
+
+				// Search options
+				$searchOpt->search_target = $obj->search_target;
+				$searchOpt->search_keyword = $obj->search_keyword;
+				$this->_setSearchOption($searchOpt, $args, $query_id, $use_division);
+
+				if ($sort_check->isExtraVars)
+				{
+					$query_id = 'document.getDocumentListExtraSort';
+					$output = executeQueryArray($query_id, $args);
+				}
+				else
+				{
+					/**
+					 * list_order asc sort of division that can be used only when
+					 **/
+					if($args->sort_index != 'list_order' || $args->order_type != 'asc') $use_division = false;
+
+					/**
+					 * If it is true, use_division changed to use the document division
+					 **/
+					if($use_division) {
+						// Division begins
+						$division = (int)Context::get('division');
+
+						// order by list_order and (module_srl===0 or module_srl many count), therefore case table full scan
+						if($args->sort_index == 'list_order' && ($args->exclude_module_srl === 0 || count($args->module_srl) > 10))
+						{
+							$listSqlID = 'document.getDocumentListUseIndex';
+							$divisionSqlID = 'document.getDocumentDivisionUseIndex';
+						}
+						else
+						{
+							$listSqlID = 'document.getDocumentList';
+							$divisionSqlID = 'document.getDocumentDivision';
+						}
+
+						// If you do not value the best division top
+						if(!$division) {
+							$division_args->module_srl = $args->module_srl;
+							$division_args->exclude_module_srl = $args->exclude_module_srl;
+							$division_args->list_count = 1;
+							$division_args->sort_index = $args->sort_index;
+							$division_args->order_type = $args->order_type;
+							$division_args->statusList = $args->statusList;
+							$output = executeQuery($listSqlID, $division_args, $columnList);
+							if($output->data) {
+								$item = array_pop($output->data);
+								$division = $item->list_order;
+							}
+							$division_args = null;
+						}
+						// The last division
+						$last_division = (int)Context::get('last_division');
+						// Division after division from the 5000 value of the specified Wanted
+						if(!$last_division) {
+							$last_division_args->module_srl = $args->module_srl;
+							$last_division_args->exclude_module_srl = $args->exclude_module_srl;
+							$last_division_args->list_count = 1;
+							$last_division_args->sort_index = $args->sort_index;
+							$last_division_args->order_type = $args->order_type;
+							$last_division_args->list_order = $division;
+							$last_division_args->page = 5001;
+							$output = executeQuery($divisionSqlID, $last_division_args, $columnList);
+							if($output->data) {
+								$item = array_pop($output->data);
+								$last_division = $item->list_order;
+							}
+						}
+						// Make sure that after last_division article
+						if($last_division) {
+							$last_division_args = null;
+							$last_division_args->module_srl = $args->module_srl;
+							$last_division_args->exclude_module_srl = $args->exclude_module_srl;
+							$last_division_args->list_order = $last_division;
+							$output = executeQuery("document.getDocumentDivisionCount", $last_division_args);
+							if($output->data->count<1) $last_division = null;
+						}
+
+						$args->division = $division;
+						$args->last_division = $last_division;
+						Context::set('division', $division);
+						Context::set('last_division', $last_division);
+					}
+					// document.getDocumentList query execution
+					// Query_id if you have a group by clause getDocumentListWithinTag getDocumentListWithinComment or used again to perform the query because
+					if(in_array($query_id, array('document.getDocumentListWithinComment', 'document.getDocumentListWithinTag'))) {
+						$group_args = clone($args);
+						$group_args->sort_index = 'documents.'.$args->sort_index;
+						$output = executeQueryArray($query_id, $group_args);
+						if(!$output->toBool()||!count($output->data)) return $output;
+
+						foreach($output->data as $key => $val) {
+							if($val->document_srl) $target_srls[] = $val->document_srl;
+						}
+
+						$page_navigation = $output->page_navigation;
+						$keys = array_keys($output->data);
+						$virtual_number = $keys[0];
+
+						$target_args->document_srls = implode(',',$target_srls);
+						$target_args->list_order = $args->sort_index;
+						$target_args->order_type = $args->order_type;
+						$target_args->list_count = $args->list_count;
+						$target_args->page = 1;
+						$output = executeQueryArray('document.getDocuments', $target_args);
+						$output->page_navigation = $page_navigation;
+						$output->total_count = $page_navigation->total_count;
+						$output->total_page = $page_navigation->total_page;
+						$output->page = $page_navigation->cur_page;
+					} else {
+						$output = executeQueryArray($query_id, $args, $columnList);
+					}
+				} 
+				// Return if no result or an error occurs
+				if(!$output->toBool()||!count($output->data)) return $output;
+
+				$idx = 0;
+				$data = $output->data;
+				unset($output->data);
+
+				if(!isset($virtual_number))
+				{
+					$keys = array_keys($data);
+					$virtual_number = $keys[0];
+				}
+
+				if($except_notice) {
+					foreach($data as $key => $attribute) {
+						if($attribute->is_notice == 'Y') $virtual_number --;
+					}
+				}
 
-			if($except_notice) {
 				foreach($data as $key => $attribute) {
-					if($attribute->is_notice == 'Y') $virtual_number --;
-				}
-			}
+					if($except_notice && $attribute->is_notice == 'Y') continue;
+					$document_srl = $attribute->document_srl;
+					if(!$GLOBALS['XE_DOCUMENT_LIST'][$document_srl]) {
+						$oDocument = null;
+						$oDocument = new documentItem();
+						$oDocument->setAttribute($attribute, false);
+						if($is_admin) $oDocument->setGrant();
+						$GLOBALS['XE_DOCUMENT_LIST'][$document_srl] = $oDocument;
+					}
+
+					$output->data[$virtual_number] = $GLOBALS['XE_DOCUMENT_LIST'][$document_srl];
+					$virtual_number --;
 
-			foreach($data as $key => $attribute) {
-				if($except_notice && $attribute->is_notice == 'Y') continue;
-				$document_srl = $attribute->document_srl;
-				if(!$GLOBALS['XE_DOCUMENT_LIST'][$document_srl]) {
-					$oDocument = null;
-					$oDocument = new documentItem();
-					$oDocument->setAttribute($attribute, false);
-					if($is_admin) $oDocument->setGrant();
-					$GLOBALS['XE_DOCUMENT_LIST'][$document_srl] = $oDocument;
 				}
 
-				$output->data[$virtual_number] = $GLOBALS['XE_DOCUMENT_LIST'][$document_srl];
-				$virtual_number --;
+				if($load_extra_vars) $this->setToAllDocumentExtraVars();
 
+				if(count($output->data)) {
+					foreach($output->data as $number => $document) {
+						$output->data[$number] = $GLOBALS['XE_DOCUMENT_LIST'][$document->document_srl];
+					}
+				}
+				//insert in cache
+				if($oCacheHandler->isSupport()) $oCacheHandler->put($cache_key,$output);
 			}
 
-			if($load_extra_vars) $this->setToAllDocumentExtraVars();
-
-            if(count($output->data)) {
-                foreach($output->data as $number => $document) {
-                    $output->data[$number] = $GLOBALS['XE_DOCUMENT_LIST'][$document->document_srl];
-                }
-            }
-
             return $output;
         }
 
diff --git a/modules/layout/layout.admin.controller.php b/modules/layout/layout.admin.controller.php
index f8093645d..1d015db0c 100644
--- a/modules/layout/layout.admin.controller.php
+++ b/modules/layout/layout.admin.controller.php
@@ -187,6 +187,13 @@
                 $oLayoutModel = &getModel('layout');
                 $cache_file = $oLayoutModel->getUserLayoutCache($args->layout_srl, Context::getLangType());
                 FileHandler::removeFile($cache_file);
+				//remove from cache
+                $oCacheHandler = &CacheHandler::getInstance('object');
+                if($oCacheHandler->isSupport()) 
+                {
+                	$cache_key = 'object:'.$args->layout_srl;
+                	$oCacheHandler->delete($cache_key);
+                }
             }
             return $output;
         }
@@ -211,6 +218,13 @@
             // Delete Layout
             $args->layout_srl = $layout_srl;
             $output = executeQuery("layout.deleteLayout", $args);
+			//remove from cache
+            $oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()) 
+            {
+            	$cache_key = 'object:'.$layout_srl;
+            	$oCacheHandler->delete($cache_key);
+            }
             if(!$output->toBool()) return $output;
 
             return new Object(0,'success_deleted');
diff --git a/modules/layout/layout.model.php b/modules/layout/layout.model.php
index cdc0a2318..0d5d44fe4 100644
--- a/modules/layout/layout.model.php
+++ b/modules/layout/layout.model.php
@@ -36,14 +36,25 @@
          * @brief Get one of layout information created in the DB
          * Return DB info + XML info of the generated layout
          **/
-        function getLayout($layout_srl) {
-            // Get information from the DB
-            $args->layout_srl = $layout_srl;
-            $output = executeQuery('layout.getLayout', $args);
-            if(!$output->data) return;
-            // Return xml file informaton after listing up the layout and extra_vars
-            $layout_info = $this->getLayoutInfo($layout, $output->data, $output->data->layout_type);
-            return $layout_info;
+		function getLayout($layout_srl) {
+            // cache controll
+			$oCacheHandler = &CacheHandler::getInstance('object');
+			if($oCacheHandler->isSupport()){
+				$cache_key = 'object:'.$layout_srl;
+				$layout_info = $oCacheHandler->get($cache_key);
+			}
+			if(!$layout_info) {
+				// Get information from the DB
+	            $args->layout_srl = $layout_srl;
+	            $output = executeQuery('layout.getLayout', $args);
+	            if(!$output->data) return;
+	            // Return xml file informaton after listing up the layout and extra_vars
+	            $layout_info = $this->getLayoutInfo($layout, $output->data, $output->data->layout_type);
+	            //insert in cache
+	            if($oCacheHandler->isSupport()) $oCacheHandler->put($cache_key,$layout_info);
+			}    	
+        	return $layout_info;
+        	
         }
 
         /**
diff --git a/modules/member/member.controller.php b/modules/member/member.controller.php
index e88e27f0a..ac2670235 100644
--- a/modules/member/member.controller.php
+++ b/modules/member/member.controller.php
@@ -1698,7 +1698,12 @@
             $oDB->commit();
             // Save Session
             if(!$this->memberInfo) $this->memberInfo = $oMemberModel->getMemberInfoByMemberSrl($args->member_srl);
-
+			//remove from cache
+            $oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()){
+            	$cache_key = 'object:'.$args->member_srl;
+            	$oCacheHandler->delete($cache_key);
+            }
             $logged_info = Context::get('logged_info');
 
             $output->add('member_srl', $args->member_srl);
@@ -1710,6 +1715,12 @@
          **/
         function updateMemberPassword($args) {
             $output = executeQuery('member.updateChangePasswordDate', $args);
+			//remove from cache
+       		$oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()){
+            	$cache_key = 'object:'.$args->member_srl;
+            	$oCacheHandler->delete($cache_key);
+            }
             $args->password = md5($args->password);
             return executeQuery('member.updateMemberPassword', $args);
         }
diff --git a/modules/member/member.model.php b/modules/member/member.model.php
index 6465aae8c..efd34d846 100644
--- a/modules/member/member.model.php
+++ b/modules/member/member.model.php
@@ -182,11 +182,21 @@
 			//columnList size zero... get full member info
             if(!$GLOBALS['__member_info__'][$member_srl] || count($columnList) == 0) {
             //if(true) {
-                $args->member_srl = $member_srl;
-                $output = executeQuery('member.getMemberInfoByMemberSrl', $args, $columnList);
-                if(!$output->data) return;
-
-                $this->arrangeMemberInfo($output->data, $site_srl);
+	            $oCacheHandler = &CacheHandler::getInstance('object');
+				if($oCacheHandler->isSupport()){
+					$cache_key = 'object:'.$member_srl;
+					$output = $oCacheHandler->get($cache_key);
+				}
+				if(!$output){
+					$args->member_srl = $member_srl;
+	                $output = executeQuery('member.getMemberInfoByMemberSrl', $args, $columnList);
+	                if(!$output->data) return;
+	                //insert in cache
+	                if($oCacheHandler->isSupport()) $oCacheHandler->put($cache_key,$output);
+				}
+				
+				$this->arrangeMemberInfo($output->data, $site_srl);
+                
             }
 
             return $GLOBALS['__member_info__'][$member_srl];
diff --git a/modules/module/module.admin.controller.php b/modules/module/module.admin.controller.php
index 8df49a7c3..799733dae 100644
--- a/modules/module/module.admin.controller.php
+++ b/modules/module/module.admin.controller.php
@@ -295,6 +295,12 @@
                 // Register
                 $oModuleController->insertModuleSkinVars($module_srl, $obj);
             }
+        	//remove from cache
+            $oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()){
+            	$cache_key = 'object:'.$module_srl;
+            	$oCacheHandler->delete($cache_key);
+            }
 
             $this->setLayoutPath('./common/tpl');
             $this->setLayoutFile('default_layout.html');
diff --git a/modules/module/module.controller.php b/modules/module/module.controller.php
index 57c90de46..f5ed63dbc 100644
--- a/modules/module/module.controller.php
+++ b/modules/module/module.controller.php
@@ -196,6 +196,12 @@
 
             }
             $output = executeQuery('module.updateSite', $args);
+			//remove from cache
+            $oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()){
+            	$cache_key = 'object:'.'default_mid';
+            	$oCacheHandler->delete($cache_key);
+            }
             return $output;
         }
 
@@ -309,6 +315,14 @@
             $oDB->commit();
 
             $output->add('module_srl',$args->module_srl);
+			//remove from cache
+            $oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()){
+            	$cache_key = 'object:'.$args->module_srl;
+            	$oCacheHandler->delete($cache_key);
+            	$cache_key = 'object:'.$args->mid;
+            	$oCacheHandler->delete($cache_key);
+            }
             return $output;
         }
 
@@ -364,7 +378,14 @@
 
             // commit
             $oDB->commit();
-
+			//remove from cache
+            $oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()){
+            	$cache_key = 'object:'.$args->module_srl;
+            	$oCacheHandler->delete($cache_key);
+            	$cache_key = 'object:'.$args->mid;
+            	$oCacheHandler->delete($cache_key);
+            }
             return $output;
         }
 
@@ -386,7 +407,13 @@
          **/
         function clearDefaultModule() {
             $output = executeQuery('module.clearDefaultModule');
-            if(!$output->toBool()) return $output;
+            //remove from cache
+            $oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()){
+            	$cache_key = 'object:'.'default_mid';
+            	$oCacheHandler->delete($cache_key);
+            }
+			if(!$output->toBool()) return $output;
 
             return $output;
         }
diff --git a/modules/module/module.model.php b/modules/module/module.model.php
index be6817ca2..7808bdc53 100644
--- a/modules/module/module.model.php
+++ b/modules/module/module.model.php
@@ -68,60 +68,68 @@
          * @brief Get the defaul mid according to the domain
          **/
         function getDefaultMid() {
-            $default_url = preg_replace('/\/$/','',Context::getDefaultUrl());
-            $request_url = preg_replace('/\/$/','',Context::getRequestUri());
-            $vid = Context::get('vid');
-            $mid = Context::get('mid');
-            // Check a virtual site if the default URL is already set and is is defferent from a requested URL
-            if($default_url && $default_url != $request_url) {
-                $url_info = parse_url($request_url);
-                $hostname = $url_info['host'];
-                $path = preg_replace('/\/$/','',$url_info['path']);
-                $sites_args->domain = sprintf('%s%s%s', $hostname, $url_info['port']&&$url_info['port']!=80?':'.$url_info['port']:'',$path);
-                $output = executeQuery('module.getSiteInfoByDomain', $sites_args);
-            }
-            if(!$output || !$output->data)
-            {
-                if(!$vid) $vid = $mid;
-                if($vid) {
-                    $vid_args->domain = $vid;
-                    $output = executeQuery('module.getSiteInfoByDomain', $vid_args);
-                    if($output->toBool() && $output->data) {
-                        Context::set('vid', $output->data->domain, true);
-                        if($mid==$output->data->domain) Context::set('mid',$output->data->mid,true);
-                    }
-                }
-            }
-            // If it is not a virtual site, get a default site information
-            if(!$output->data) {
-                $args->site_srl = 0;
-                $output = executeQuery('module.getSiteInfo', $args);
-                // Update the related informaion if there is no default site info
-                if(!$output->data) {
-                    // Create a table if sites table doesn't exist
-                    $oDB = &DB::getInstance();
-                    if(!$oDB->isTableExists('sites')) $oDB->createTableByXmlFile(_XE_PATH_.'modules/module/schemas/sites.xml');
-                    if(!$oDB->isTableExists('sites')) return;
-                    // Get mid, language
-                    $mid_output = $oDB->executeQuery('module.getDefaultMidInfo', $args);
-                    $db_info = Context::getDBInfo();
-                    $domain = Context::getDefaultUrl();
-                    $url_info = parse_url($domain);
-                    $domain = $url_info['host'].( (!empty($url_info['port'])&&$url_info['port']!=80)?':'.$url_info['port']:'').$url_info['path'];
-                    $site_args->site_srl = 0;
-                    $site_args->index_module_srl  = $mid_output->data->module_srl;
-                    $site_args->domain = $domain;
-                    $site_args->default_language = $db_info->lang_type;
-
-                    if($output->data && !$output->data->index_module_srl) {
-                        $output = executeQuery('module.updateSite', $site_args);
-                    } else {
-                        $output = executeQuery('module.insertSite', $site_args);
-                        if(!$output->toBool()) return $output;
-                    }
-                    $output = executeQuery('module.getSiteInfo', $args);
-                }
-            }
+        	$oCacheHandler = &CacheHandler::getInstance('object');
+			if($oCacheHandler->isSupport()){
+				$cache_key = 'object:'.'default_mid';
+				$output = $oCacheHandler->get($cache_key);
+			}
+			if(!$output){
+	            $default_url = preg_replace('/\/$/','',Context::getDefaultUrl());
+	            $request_url = preg_replace('/\/$/','',Context::getRequestUri());
+	            $vid = Context::get('vid');
+	            $mid = Context::get('mid');
+	            // Check a virtual site if the default URL is already set and is is defferent from a requested URL
+	            if($default_url && $default_url != $request_url) {
+	                $url_info = parse_url($request_url);
+	                $hostname = $url_info['host'];
+	                $path = preg_replace('/\/$/','',$url_info['path']);
+	                $sites_args->domain = sprintf('%s%s%s', $hostname, $url_info['port']&&$url_info['port']!=80?':'.$url_info['port']:'',$path);
+	                $output = executeQuery('module.getSiteInfoByDomain', $sites_args);
+	            }
+	            if(!$output || !$output->data)
+	            {
+	                if(!$vid) $vid = $mid;
+	                if($vid) {
+	                    $vid_args->domain = $vid;
+	                    $output = executeQuery('module.getSiteInfoByDomain', $vid_args);
+	                    if($output->toBool() && $output->data) {
+	                        Context::set('vid', $output->data->domain, true);
+	                        if($mid==$output->data->domain) Context::set('mid',$output->data->mid,true);
+	                    }
+	                }
+	            }
+	            // If it is not a virtual site, get a default site information
+	            if(!$output->data) {
+	                $args->site_srl = 0;
+	                $output = executeQuery('module.getSiteInfo', $args);
+	                // Update the related informaion if there is no default site info
+	                if(!$output->data) {
+	                    // Create a table if sites table doesn't exist
+	                    $oDB = &DB::getInstance();
+	                    if(!$oDB->isTableExists('sites')) $oDB->createTableByXmlFile(_XE_PATH_.'modules/module/schemas/sites.xml');
+	                    if(!$oDB->isTableExists('sites')) return;
+	                    // Get mid, language
+	                    $mid_output = $oDB->executeQuery('module.getDefaultMidInfo', $args);
+	                    $db_info = Context::getDBInfo();
+	                    $domain = Context::getDefaultUrl();
+	                    $url_info = parse_url($domain);
+	                    $domain = $url_info['host'].( (!empty($url_info['port'])&&$url_info['port']!=80)?':'.$url_info['port']:'').$url_info['path'];
+	                    $site_args->site_srl = 0;
+	                    $site_args->index_module_srl  = $mid_output->data->module_srl;
+	                    $site_args->domain = $domain;
+	                    $site_args->default_language = $db_info->lang_type;
+	
+	                    if($output->data && !$output->data->index_module_srl) {
+	                        $output = executeQuery('module.updateSite', $site_args);
+	                    } else {
+	                        $output = executeQuery('module.insertSite', $site_args);
+	                        if(!$output->toBool()) return $output;
+	                    }
+	                    $output = executeQuery('module.getSiteInfo', $args);
+	                }
+	            }
+	            if($oCacheHandler->isSupport()) $oCacheHandler->put($cache_key,$output);
+			}
             $module_info = $output->data;
             if(!$module_info->module_srl) return $module_info;
             if(is_array($module_info) && $module_info->data[0]) $module_info = $module_info[0];
@@ -134,7 +142,23 @@
         function getModuleInfoByMid($mid, $site_srl = 0, $columnList = array()) {
             $args->mid = $mid;
             $args->site_srl = (int)$site_srl;
-            $output = executeQuery('module.getMidInfo', $args, $columnList);
+            $oCacheHandler = &CacheHandler::getInstance('object');
+        	if($oCacheHandler->isSupport()){
+					$cache_key = 'object:'.$mid;
+					$module_srl = $oCacheHandler->get($cache_key);
+					if($module_srl){
+						$cache_key = 'object:'.$module_srl;
+						$output = $oCacheHandler->get($cache_key);
+					}
+			}
+			if(!$output){
+				$output = executeQuery('module.getMidInfo', $args);
+				if($oCacheHandler->isSupport()) {
+					$cache_key = 'object:'.$mid;
+					$oCacheHandler->put($cache_key,$output->data->module_srl);
+				}
+			}
+		
             $module_info = $output->data;
             if(!$module_info->module_srl && $module_info->data[0]) $module_info = $module_info->data[0];
             return $this->addModuleExtraVars($module_info);
@@ -146,10 +170,24 @@
         function getModuleInfoByModuleSrl($module_srl, $columnList = array()) {
             // Get data
             $args->module_srl = $module_srl;
-            $output = executeQuery('module.getMidInfo', $args, $columnList);
-            if(!$output->data) return;
-            $module_info = $this->addModuleExtraVars($output->data);
-            return $module_info;
+        	$oCacheHandler = &CacheHandler::getInstance('object');
+			if($oCacheHandler->isSupport()){
+				$cache_key = 'object:'.$module_srl;
+				$output = $oCacheHandler->get($cache_key);
+			}
+			if(!$output){
+            	$output = executeQuery('module.getMidInfo', $args );
+            	if(!$output->data) return;
+            	if($oCacheHandler->isSupport()) $oCacheHandler->put($cache_key,$output);
+			}
+    		if(count($columnList)){
+				foreach ($output->data as $key => $item) {
+		            if (in_array($key, $columnList)){
+		            	$module_info->$key = $item;
+		            }
+	            }
+			} else $module_info = $output->data;
+            return $this->addModuleExtraVars($module_info);
         }
 
         /**
diff --git a/modules/session/queries/getExpiredSessions.xml b/modules/session/queries/getExpiredSessions.xml
new file mode 100644
index 000000000..3f79ba41b
--- /dev/null
+++ b/modules/session/queries/getExpiredSessions.xml
@@ -0,0 +1,12 @@
+<query id="getExpiredSession" action="select">
+    <tables>
+        <table name="session" />
+    </tables>
+    <columns>
+        <column name="session_key" />
+    </columns>
+    <conditions>
+        <condition operation="less" column="expired" default="curdate()" notnull="notnull" />
+    </conditions>
+</query>
+
diff --git a/modules/session/session.controller.php b/modules/session/session.controller.php
index 16cb2186d..523d5dc46 100644
--- a/modules/session/session.controller.php
+++ b/modules/session/session.controller.php
@@ -23,11 +23,21 @@
 
         function write($session_key, $val) {
             if(!$session_key || !$this->session_started) return;
-
+       		$oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()) {
+            	$cache_key = 'object:'.$session_key;
+            	$cache_vars = $oCacheHandler->get($cache_key);
+            }
+            
             $args->session_key = $session_key;
-            $output = executeQuery('session.getSession', $args);
-            $session_info = $output->data;
+            if($cache_vars) $session_info = $cache_vars;
+             else {
+             	$output = executeQuery('session.getSession', $args);
+            	$session_info = $output->data;
+             }
+            //if ip has changed delete the session from cache and db
             if($session_info->session_key == $session_key && $session_info->ipaddress != $_SERVER['REMOTE_ADDR']) {
+            	if($oCacheHandler->isSupport())  $oCacheHandler->delete($cache_key);
                 executeQuery('session.deleteSession', $args);
                 return true;
             }
@@ -46,16 +56,53 @@
             } else {
                 $args->member_srl = 0;
             }
-
-            if($session_info->session_key) $output = executeQuery('session.updateSession', $args);
-            else $output = executeQuery('session.insertSession', $args);
-
+            $args->ipaddress = $_SERVER['REMOTE_ADDR'];
+            $args->last_update = date("YmdHis", time());
+            $diff = $args->last_update - $cache_vars->last_update;
+        	//verify if session values have changed
+            if($val == $cache_vars->val){
+            	// if more than 5 minutes passed than modify the db session also
+            	if($diff > 300){
+            		//put session into cache
+		            if($oCacheHandler->isSupport()) {
+		            	$cache_key = 'object:'.$session_key;
+		            	$oCacheHandler->put($cache_key,$args);
+		            }
+		            //put session into db
+		            if($session_info->session_key) $output = executeQuery('session.updateSession', $args);
+            	}
+            	else {
+            		//put session into cache
+		            if($oCacheHandler->isSupport()) {
+		            	$cache_key = 'object:'.$session_key;
+		            	$oCacheHandler->put($cache_key,$args);
+		            }
+            	}
+            }
+            else {
+            		//put session into cache
+		            if($oCacheHandler->isSupport()) {
+		            	$cache_key = 'object:'.$session_key;
+		            	$oCacheHandler->put($cache_key,$args);
+		            }
+		            //put session into db
+		            if($session_info->session_key) $output = executeQuery('session.updateSession', $args);
+		            else $output = executeQuery('session.insertSession', $args);
+            }
+			
+            
             return true;
         }
 
         function destroy($session_key) {
             if(!$session_key || !$this->session_started) return;
-
+            //remove session from cache
+        	$oCacheHandler = &CacheHandler::getInstance('object');
+            if($oCacheHandler->isSupport()) {
+            	$cache_key = 'object:'.$session_key;
+            	$oCacheHandler->delete($cache_key);
+            }
+            //remove session from db
             $args->session_key = $session_key;
             executeQuery('session.deleteSession', $args);
             return true;
@@ -63,6 +110,17 @@
 
         function gc($maxlifetime) {
             if(!$this->session_started) return;
+            $expired_sessions = executeQueryArray('session.getExpiredSessions');
+            if($expired_session){
+            	foreach ($expired_sessions as $session_key){
+            	//remove session from cache
+		        	$oCacheHandler = &CacheHandler::getInstance('object');
+		            if($oCacheHandler->isSupport()) {
+		            	$cache_key = 'object:'.$session_key;
+		            	$oCacheHandler->delete($cache_key);
+		            }
+            	}
+            }
             executeQuery('session.gcSession');
             return true;
         }
diff --git a/modules/session/session.model.php b/modules/session/session.model.php
index 4a8d07d25..b08375bb7 100644
--- a/modules/session/session.model.php
+++ b/modules/session/session.model.php
@@ -19,23 +19,31 @@
 
         function read($session_key) {
             if(!$session_key || !$this->session_started) return;
+            
+        	$oCacheHandler = &CacheHandler::getInstance('object');
+			if($oCacheHandler->isSupport()){
+				$cache_key = 'object:'.$session_key;
+				$output->data = $oCacheHandler->get($cache_key);
+			}
+			if(!$output->data) {
 
-            $args->session_key = $session_key;
-			$columnList = array('session_key', 'cur_mid', 'val');
-            $output = executeQuery('session.getSession', $args, $columnList);
-            // Confirm there is a table created if read error occurs
-            if(!$output->toBool()) {
-                $oDB = &DB::getInstance();
-                if(!$oDB->isTableExists('session')) $oDB->createTableByXmlFile($this->module_path.'schemas/session.xml');
-                if(!$oDB->isColumnExists("session","cur_mid")) $oDB->addColumn('session',"cur_mid","varchar",128);
-                $output = executeQuery('session.getSession', $args);
-            }
-            // Check if there is a table created in case there is no "cur_mid" value in the sessions information
-            if(!isset($output->data->cur_mid)) {
-                $oDB = &DB::getInstance();
-                if(!$oDB->isColumnExists("session","cur_mid")) $oDB->addColumn('session',"cur_mid","varchar",128);
-            }
-
+				$args->session_key = $session_key;
+				$columnList = array('session_key', 'cur_mid', 'val');
+	            $output = executeQuery('session.getSession', $args, $columnList);
+	            // Confirm there is a table created if read error occurs
+	            if(!$output->toBool()) {
+	                $oDB = &DB::getInstance();
+	                if(!$oDB->isTableExists('session')) $oDB->createTableByXmlFile($this->module_path.'schemas/session.xml');
+	                if(!$oDB->isColumnExists("session","cur_mid")) $oDB->addColumn('session',"cur_mid","varchar",128);
+	                $output = executeQuery('session.getSession', $args);
+	            }
+	            // Check if there is a table created in case there is no "cur_mid" value in the sessions information
+	            if(!isset($output->data->cur_mid)) {
+	                $oDB = &DB::getInstance();
+	                if(!$oDB->isColumnExists("session","cur_mid")) $oDB->addColumn('session',"cur_mid","varchar",128);
+	            }
+	           
+			}
             return $output->data->val;
         }