Index: branches/5.2.x/core/units/categories/categories_event_handler.php
===================================================================
diff -u -r16621 -r16655
--- branches/5.2.x/core/units/categories/categories_event_handler.php	(.../categories_event_handler.php)	(revision 16621)
+++ branches/5.2.x/core/units/categories/categories_event_handler.php	(.../categories_event_handler.php)	(revision 16655)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: categories_event_handler.php 16621 2018-04-06 14:17:13Z alex $
+* @version	$Id: categories_event_handler.php 16655 2021-01-04 08:47:57Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -2764,17 +2764,21 @@
 			}
 
 			// building final search query
+			$search_table_exists = $this->Conn->Query('SHOW TABLES LIKE "'.$search_table.'"');
+
 			if (!$this->Application->GetVar('do_not_drop_search_table')) {
-				$this->Conn->Query('DROP TABLE IF EXISTS '.$search_table); // erase old search table if clean k4 event
+				if ( $search_table_exists ) {
+					$this->Conn->Query('TRUNCATE TABLE '.$search_table);
+				}
+
 				$this->Application->SetVar('do_not_drop_search_table', true);
 			}
 
-			$search_table_exists = $this->Conn->Query('SHOW TABLES LIKE "'.$search_table.'"');
 			if ($search_table_exists) {
 				$select_intro = 'INSERT INTO '.$search_table.' (Relevance, ItemId, ResourceId, ItemType, EdPick) ';
 			}
 			else {
-				$select_intro = 'CREATE TABLE '.$search_table.' AS ';
+				$select_intro = 'CREATE TABLE '.$search_table.' ENGINE = MEMORY AS ';
 			}
 
 			$edpick_clause = $this->Application->getUnitOption($event->Prefix.'.EditorsPick', 'Fields') ? $items_table.'.EditorsPick' : '0';