diff -r 47c552136a6e -r 30a0c928e373 includes/database.mysql.inc
--- includes/database.mysql.inc
+++ includes/database.mysql.inc
@@ -354,7 +354,14 @@
  *   TRUE if the table exists, and FALSE if the table does not exist.
  */
 function db_table_exists($table) {
-  return (bool) db_fetch_object(db_query("SHOW TABLES LIKE '{". db_escape_table($table) ."}'"));
+	$table = explode('.', db_prefix_tables("{".db_escape_table($table)."}"));
+	if (count($table) > 1) {
+		$query = "SHOW TABLES IN ".$table[0]." LIKE '".$table[1]."'";
+	} else {
+		$query = "SHOW TABLES LIKE '".$table[0]."'";
+	}
+	
+  return (bool) db_fetch_object(db_query($query));
 }
 
 /**
diff -r 47c552136a6e -r 30a0c928e373 includes/database.mysqli.inc
--- includes/database.mysqli.inc
+++ includes/database.mysqli.inc
@@ -354,7 +354,14 @@
  *   TRUE if the table exists, and FALSE if the table does not exist.
  */
 function db_table_exists($table) {
-  return (bool) db_fetch_object(db_query("SHOW TABLES LIKE '{". db_escape_table($table) ."}'"));
+	$table = explode('.', db_prefix_tables("{".db_escape_table($table)."}"));
+	if (count($table) > 1) {
+		$query = "SHOW TABLES IN ".$table[0]." LIKE '".$table[1]."'";
+	} else {
+		$query = "SHOW TABLES LIKE '".$table[0]."'";
+	}
+	
+  return (bool) db_fetch_object(db_query($query));
 }
 
 /**