diff --git a/adm/admin.lib.php b/adm/admin.lib.php
index 44ea31f1f..061f7992d 100644
--- a/adm/admin.lib.php
+++ b/adm/admin.lib.php
@@ -57,26 +57,6 @@ function get_skin_dir($skin, $skin_path=G5_SKIN_PATH)
 }
 
 
-// 회원 삭제
-function member_delete($mb_id)
-{
-    global $config;
-    global $g5;
-
-    $sql = " select mb_name, mb_nick, mb_ip, mb_recommend, mb_memo, mb_level from {$g5['member_table']} where mb_id= '".$mb_id."' ";
-    $mb = sql_fetch($sql);
-    if ($mb['mb_recommend']) {
-        $row = sql_fetch(" select count(*) as cnt from {$g5['member_table']} where mb_id = '".addslashes($mb['mb_recommend'])."' ");
-        if ($row['cnt'])
-            insert_point($mb['mb_recommend'], $config['cf_recommend_point'] * (-1), $mb_id.'님의 회원자료 삭제로 인한 추천인 포인트 반환', "@member", $mb['mb_recommend'], $mb_id.' 추천인 삭제');
-    }
-
-    // 회원자료는 정보만 없앤 후 아이디는 보관하여 다른 사람이 사용하지 못하도록 함 : 061025
-    $sql = " update {$g5['member_table']} set mb_password = '', mb_level = 1, mb_email = '', mb_homepage = '', mb_tel = '', mb_hp = '', mb_zip1 = '', mb_zip2 = '', mb_addr1 = '', mb_addr2 = '', mb_birth = '', mb_sex = '', mb_signature = '', mb_memo = '".date('Ymd', G5_SERVER_TIME)." 삭제함\n{$mb['mb_memo']}', mb_leave_date = '".date('Ymd', G5_SERVER_TIME)."' where mb_id = '{$mb_id}' ";
-    sql_query($sql);
-}
-
-
 // 회원권한을 SELECT 형식으로 얻음
 function get_member_level_select($name, $start_id=0, $end_id=10, $selected="", $event="")
 {
diff --git a/adm/config_form.php b/adm/config_form.php
index 570022943..48a7179f1 100644
--- a/adm/config_form.php
+++ b/adm/config_form.php
@@ -162,6 +162,11 @@ if(!isset($config['cf_lg_mid'])) {
                     ADD `cf_lg_mert_key` varchar(255) NOT NULL DEFAULT '' AFTER `cf_lg_mid` ", true);
 }
 
+if(!isset($config['cf_optimize_date'])) {
+    sql_query(" ALTER TABLE `{$g5['config_table']}`
+                    ADD `cf_optimize_date` date NOT NULL default '0000-00-00' AFTER `cf_popular_del` ", true);
+}
+
 if(!$config['cf_faq_skin']) $config['cf_faq_skin'] = "basic";
 if(!$config['cf_mobile_faq_skin']) $config['cf_mobile_faq_skin'] = "basic";
 
diff --git a/bbs/db_table.optimize.php b/bbs/db_table.optimize.php
new file mode 100644
index 000000000..f676ce4ef
--- /dev/null
+++ b/bbs/db_table.optimize.php
@@ -0,0 +1,57 @@
+<?php
+if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
+
+// 최고관리자일 때만 실행
+if($config['cf_admin'] != $member['mb_id'] || $is_admin != 'super')
+    return;
+
+// 실행일 비교
+if(isset($config['cf_optimize_date']) && $config['cf_optimize_date'] >= G5_TIME_YMD)
+    return;
+
+// 설정일이 지난 접속자로그 삭제
+if($config['cf_visit_del'] > 0) {
+    $tmp_before_date = date("Y-m-d", G5_SERVER_TIME - ($config['cf_visit_del'] * 86400));
+    $sql = " delete from {$g5['visit_table']} where vi_date < '$tmp_before_date' ";
+    sql_query($sql);
+    sql_query(" OPTIMIZE TABLE `{$g5['visit_table']}`, `{$g5['visit_sum_table']}` ");
+}
+
+// 설정일이 지난 인기검색어 삭제
+if($config['cf_popular_del'] > 0) {
+    $tmp_before_date = date("Y-m-d", G5_SERVER_TIME - ($config['cf_popular_del'] * 86400));
+    $sql = " delete from {$g5['popular_table']} where pp_date < '$tmp_before_date' ";
+    sql_query($sql);
+    sql_query(" OPTIMIZE TABLE `{$g5['popular_table']}` ");
+}
+
+// 설정일이 지난 최근게시물 삭제
+if($config['cf_new_del'] > 0) {
+    $sql = " delete from {$g5['board_new_table']} where (TO_DAYS('".G5_TIME_YMDHIS."') - TO_DAYS(bn_datetime)) > '{$config['cf_new_del']}' ";
+    sql_query($sql);
+    sql_query(" OPTIMIZE TABLE `{$g5['board_new_table']}` ");
+}
+
+// 설정일이 지난 쪽지 삭제
+if($config['cf_memo_del'] > 0) {
+    $sql = " delete from {$g5['memo_table']} where (TO_DAYS('".G5_TIME_YMDHIS."') - TO_DAYS(me_send_datetime)) > '{$config['cf_memo_del']}' ";
+    sql_query($sql);
+    sql_query(" OPTIMIZE TABLE `{$g5['memo_table']}` ");
+}
+
+// 탈퇴회원 자동 삭제
+if($config['cf_leave_day'] > 0) {
+    $sql = " select mb_id from {$g5['member_table']} where (TO_DAYS('".G5_TIME_YMDHIS."') - TO_DAYS(mb_leave_date)) > '{$config['cf_leave_day']}' ";
+    $result = sql_query($sql);
+    while ($row=sql_fetch_array($result))
+    {
+        // 회원자료 삭제
+        member_delete($row['mb_id']);
+    }
+}
+
+// 실행일 기록
+if(isset($config['cf_optimize_date'])) {
+    sql_query(" update {$g5['config_table']} set cf_optimize_date = '".G5_TIME_YMD."' ");
+}
+?>
\ No newline at end of file
diff --git a/bbs/memo.php b/bbs/memo.php
index f5e4f032a..4d9c0129a 100644
--- a/bbs/memo.php
+++ b/bbs/memo.php
@@ -1,18 +1,12 @@
 <?php
 include_once('./_common.php');
-    
-if ($is_guest) 
+
+if ($is_guest)
     alert_close('회원만 이용하실 수 있습니다.');
 
 $g5['title'] = '내 쪽지함';
 include_once(G5_PATH.'/head.sub.php');
 
-// 설정일이 지난 메모 삭제
-$sql = " delete from {$g5['memo_table']}
-            where me_recv_mb_id = '{$member['mb_id']}'
-            and me_send_datetime < '".date("Y-m-d H:i:s", G5_SERVER_TIME - (86400 * $config['cf_memo_del']))."' ";
-sql_query($sql);
-
 if (!$kind) $kind = 'recv';
 
 if ($kind == 'recv')
diff --git a/common.php b/common.php
index 0ba43ce95..3e12011eb 100644
--- a/common.php
+++ b/common.php
@@ -471,6 +471,10 @@ if (G5_IS_MOBILE) {
 include_once(G5_BBS_PATH.'/visit_insert.inc.php');
 
 
+// 일정 기간이 지난 DB 데이터 삭제 및 최적화
+include_once(G5_BBS_PATH.'/db_table.optimize.php');
+
+
 // common.php 파일을 수정할 필요가 없도록 확장합니다.
 $extend_file = array();
 $tmp = dir(G5_EXTEND_PATH);
diff --git a/install/gnuboard5.sql b/install/gnuboard5.sql
index 160d07850..5e7eef002 100644
--- a/install/gnuboard5.sql
+++ b/install/gnuboard5.sql
@@ -251,6 +251,7 @@ CREATE TABLE IF NOT EXISTS `g5_config` (
   `cf_memo_del` int(11) NOT NULL DEFAULT '0',
   `cf_visit_del` int(11) NOT NULL DEFAULT '0',
   `cf_popular_del` int(11) NOT NULL DEFAULT '0',
+  `cf_optimize_date` date NOT NULL default '0000-00-00',
   `cf_use_member_icon` tinyint(4) NOT NULL DEFAULT '0',
   `cf_member_icon_size` int(11) NOT NULL DEFAULT '0',
   `cf_member_icon_width` int(11) NOT NULL DEFAULT '0',
diff --git a/lib/common.lib.php b/lib/common.lib.php
index 02860e0a5..d0077577f 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -364,7 +364,8 @@ function get_list($write_row, $board, $skin_url, $subject_len=40)
     $list = $write_row;
     unset($write_row);
 
-    $list['is_notice'] = preg_match("/[^0-9]{0,1}{$list['wr_id']}[\r]{0,1}/",$board['bo_notice']);
+    $board_notice = array_map('trim', explode(',', $board['bo_notice']));
+    $list['is_notice'] = in_array($list['wr_id'], $board_notice);
 
     if ($subject_len)
         $list['subject'] = conv_subject($list['wr_subject'], $subject_len, '…');
@@ -2690,4 +2691,23 @@ function conv_unescape_nl($str)
 
     return str_replace($search, $replace, $str);
 }
+
+// 회원 삭제
+function member_delete($mb_id)
+{
+    global $config;
+    global $g5;
+
+    $sql = " select mb_name, mb_nick, mb_ip, mb_recommend, mb_memo, mb_level from {$g5['member_table']} where mb_id= '".$mb_id."' ";
+    $mb = sql_fetch($sql);
+    if ($mb['mb_recommend']) {
+        $row = sql_fetch(" select count(*) as cnt from {$g5['member_table']} where mb_id = '".addslashes($mb['mb_recommend'])."' ");
+        if ($row['cnt'])
+            insert_point($mb['mb_recommend'], $config['cf_recommend_point'] * (-1), $mb_id.'님의 회원자료 삭제로 인한 추천인 포인트 반환', "@member", $mb['mb_recommend'], $mb_id.' 추천인 삭제');
+    }
+
+    // 회원자료는 정보만 없앤 후 아이디는 보관하여 다른 사람이 사용하지 못하도록 함 : 061025
+    $sql = " update {$g5['member_table']} set mb_password = '', mb_level = 1, mb_email = '', mb_homepage = '', mb_tel = '', mb_hp = '', mb_zip1 = '', mb_zip2 = '', mb_addr1 = '', mb_addr2 = '', mb_birth = '', mb_sex = '', mb_signature = '', mb_memo = '".date('Ymd', G5_SERVER_TIME)." 삭제함\n{$mb['mb_memo']}', mb_leave_date = '".date('Ymd', G5_SERVER_TIME)."' where mb_id = '{$mb_id}' ";
+    sql_query($sql);
+}
 ?>
\ No newline at end of file
diff --git a/lib/thumbnail.lib.php b/lib/thumbnail.lib.php
index f8db59dd8..a338770f9 100644
--- a/lib/thumbnail.lib.php
+++ b/lib/thumbnail.lib.php
@@ -161,6 +161,9 @@ function get_view_thumbnail($contents, $thumb_width=0)
             else
                 $thumb_file = $filename;
 
+            if(!$thumb_file)
+                continue;
+
             if ($width) {
                 $thumb_tag = '<img src="'.G5_URL.str_replace($filename, $thumb_file, $data_path).'" alt="'.$alt.'" width="'.$width.'" height="'.$height.'"/>';
             } else {
@@ -169,7 +172,7 @@ function get_view_thumbnail($contents, $thumb_width=0)
 
             // $img_tag에 editor 경로가 있으면 원본보기 링크 추가
             $img_tag = $matches[0][$i];
-            if(strpos($img_tag, 'data/editor') && preg_match("/\.({$config['cf_image_extension']})$/i", $filename)) {
+            if(strpos($img_tag, G5_DATA_DIR.'/'.G5_EDITOR_DIR) && preg_match("/\.({$config['cf_image_extension']})$/i", $filename)) {
                 $imgurl = str_replace(G5_URL, "", $src);
                 $thumb_tag = '<a href="'.G5_BBS_URL.'/view_image.php?fn='.urlencode($imgurl).'" target="_blank" class="view_image">'.$thumb_tag.'</a>';
             }
@@ -204,6 +207,10 @@ function thumbnail($filename, $source_path, $target_path, $thumb_width, $thumb_h
         @chmod($target_path, G5_DIR_PERMISSION);
     }
 
+    // 디렉토리가 존재하지 않거나 쓰기 권한이 없으면 썸네일 생성하지 않음
+    if(!(is_dir($target_path) && is_writable($target_path)))
+        return '';
+
     // Animated GIF는 썸네일 생성하지 않음
     if($size[2] == 1) {
         if(is_animated_gif($source_file))