diff --git a/broker/migrate/h2/V50__update_group_member_index.sql b/broker/migrate/h2/V50__update_group_member_index.sql
new file mode 100755
index 00000000..df34b7a1
--- /dev/null
+++ b/broker/migrate/h2/V50__update_group_member_index.sql
@@ -0,0 +1 @@
+CREATE INDEX `user_gid_mid_dt_index` ON `t_group_member` (`_gid`, `_mid`, `_dt`);
diff --git a/broker/migrate/mysql/V57__update_group_member_index.sql b/broker/migrate/mysql/V57__update_group_member_index.sql
new file mode 100755
index 00000000..df34b7a1
--- /dev/null
+++ b/broker/migrate/mysql/V57__update_group_member_index.sql
@@ -0,0 +1 @@
+CREATE INDEX `user_gid_mid_dt_index` ON `t_group_member` (`_gid`, `_mid`, `_dt`);