diff --git a/application/migrations/203_contest_idx.php b/application/migrations/203_contest_idx.php
new file mode 100644
index 000000000..afd55f474
--- /dev/null
+++ b/application/migrations/203_contest_idx.php
@@ -0,0 +1,33 @@
+<?php
+
+defined('BASEPATH') or exit('No direct script access allowed');
+
+// Add index for table to speedup LBA
+
+class Migration_contest_idx extends CI_Migration {
+
+	public function up() {
+		$this->add_ix('contest','idx_contest_adifname','`adifname`');
+	}
+
+	public function down() { 
+		$this->rm_ix('contest','idx_contest_adifname');
+	}
+
+	private function add_ix($table_name,$index,$cols) {
+		$ix_exist = $this->db->query("SHOW INDEX FROM ".$table_name." WHERE Key_name = '".$index."'")->num_rows();
+		if ($ix_exist == 0) {
+			$sql = "ALTER TABLE ".$table_name." ADD INDEX `".$index."` (".$cols.");";
+			$this->db->query($sql);
+		}
+	}
+
+	private function rm_ix($table_name,$index) {
+		$ix_exist = $this->db->query("SHOW INDEX FROM ".$table_name." WHERE Key_name = '".$index."'")->num_rows();
+		if ($ix_exist >= 1) {
+			$sql = "ALTER TABLE ".$table_name." DROP INDEX `".$index."`;";
+			$this->db->query($sql);
+		}
+	}
+
+}