diff --git a/big_tests/tests/auth_methods_for_c2s_SUITE.erl b/big_tests/tests/auth_methods_for_c2s_SUITE.erl
index 689e16c7250..b072dacb21a 100644
--- a/big_tests/tests/auth_methods_for_c2s_SUITE.erl
+++ b/big_tests/tests/auth_methods_for_c2s_SUITE.erl
@@ -33,12 +33,12 @@ end_per_suite(Config) ->
     escalus:end_per_suite(Config).
 
 init_per_group(metrics, Config) ->
-    Config;
+    set_auth_mod(Config);
 init_per_group(_, Config0) ->
     Config1 = ejabberd_node_utils:init(Config0),
     ejabberd_node_utils:backup_config_file(Config1),
-    modify_config_and_restart(Config1),
-    escalus_cleaner:start(Config1).
+    Config2 = modify_config_and_restart(Config1),
+    escalus_cleaner:start(Config2).
 
 end_per_group(metrics, _Config) ->
     escalus_fresh:clean();
@@ -49,7 +49,7 @@ end_per_group(_, Config) ->
 
 init_per_testcase(TC, Config) ->
     Spec = escalus_fresh:freshen_spec(Config, alice),
-    Clean = register_internal_user(Spec),
+    Clean = register_user(Config, Spec),
     [{clean_fn, Clean}, {spec, Spec}|escalus:init_per_testcase(TC, Config)].
 
 end_per_testcase(TC, Config) ->
@@ -57,12 +57,28 @@ end_per_testcase(TC, Config) ->
     Clean(),
     escalus:end_per_testcase(TC, Config).
 
+set_auth_mod(Config) ->
+    Mod = case mongoose_helper:is_rdbms_enabled(domain_helper:host_type()) of
+            true ->
+                ejabberd_auth_rdbms;
+            false ->
+                ejabberd_auth_internal
+        end,
+    [{auth_mod, Mod} | Config].
+
 modify_config_and_restart(Config) ->
-    NewConfigValues = [{auth_method, "internal]\n  [auth.dummy"},
+    {Method, Mod} = case mongoose_helper:is_rdbms_enabled(domain_helper:host_type()) of
+            true ->
+                {"rdbms", ejabberd_auth_rdbms};
+            false ->
+                {"internal", ejabberd_auth_internal}
+        end,
+    NewConfigValues = [{auth_method, Method ++ "]\n  [auth.dummy"},
                        {auth_method_opts, false},
-                       {allowed_auth_methods, "\"internal\""}],
+                       {allowed_auth_methods, "\"" ++ Method ++ "\""}],
     ejabberd_node_utils:modify_config_file(NewConfigValues, Config),
-    ejabberd_node_utils:restart_application(mongooseim).
+    ejabberd_node_utils:restart_application(mongooseim),
+    [{auth_mod, Mod} | Config].
 
 can_login_with_allowed_method(Config) ->
     Spec = proplists:get_value(spec, Config),
@@ -94,13 +110,14 @@ metrics_incremented_on_user_connect(ConfigIn) ->
 %% Helpers
 %% If dummy backend is enabled, it is not possible to create new users
 %% (we check if an user does exist before registering the user).
-register_internal_user(Spec) ->
+register_user(Config, Spec) ->
+    Mod = proplists:get_value(auth_mod, Config),
     #{username := User, server := Server,
       password := Password} = maps:from_list(Spec),
     LUser = jid:nodeprep(User),
     LServer = escalus_utils:jid_to_lower(Server),
     HostType = domain_helper:host_type(),
-    rpc(mim(), ejabberd_auth_internal, try_register,
+    ok = rpc(mim(), Mod, try_register,
         [HostType, LUser, LServer, Password]),
-    fun() -> rpc(mim(), ejabberd_auth_internal, remove_user,
+    fun() -> rpc(mim(), Mod, remove_user,
                  [HostType, LUser, LServer]) end.
diff --git a/big_tests/tests/mod_global_distrib_SUITE.erl b/big_tests/tests/mod_global_distrib_SUITE.erl
index 14b91b6fc64..266f4bb2c4f 100644
--- a/big_tests/tests/mod_global_distrib_SUITE.erl
+++ b/big_tests/tests/mod_global_distrib_SUITE.erl
@@ -120,8 +120,12 @@ init_per_suite(Config) ->
     case {rpc(europe_node1, mongoose_wpool, get_worker, [redis, global, global_distrib]),
           rpc(asia_node, mongoose_wpool, get_worker, [redis, global, global_distrib])} of
         {{ok, _}, {ok, _}} ->
-            ok = rpc(europe_node2, mongoose_cluster, join, [ct:get_config(europe_node1)]),
-
+            case ct_helper:get_internal_database() of
+                mnesia ->
+                    ok = rpc(europe_node2, mongoose_cluster, join, [ct:get_config(europe_node1)]);
+                _ ->
+                    ok
+            end,
             enable_logging(),
             escalus:init_per_suite([{add_advertised_endpoints, []}, {extra_config, #{}} | Config]);
         Result ->
diff --git a/src/mongoose_internal_databases.erl b/src/mongoose_internal_databases.erl
index 79eb4ff88f1..97d2b985460 100644
--- a/src/mongoose_internal_databases.erl
+++ b/src/mongoose_internal_databases.erl
@@ -10,8 +10,7 @@ init() ->
             %% Ensure mnesia is stopped when applying the test presets from the big tests.
             %% So, we accidentually do not test with mnesia enabled, when starting the
             %% test cases from the clean test build.
-            %% TODO Stopping here would break a lot of tests, stop here once tests are fixed.
-            % mnesia:stop(),
+            mnesia:stop(),
             ok
     end.