diff --git a/apps/desktop/src/components/diff/SchemaDiffConfigStep.vue b/apps/desktop/src/components/diff/SchemaDiffConfigStep.vue
index df1565c0ef..67853c6f02 100644
--- a/apps/desktop/src/components/diff/SchemaDiffConfigStep.vue
+++ b/apps/desktop/src/components/diff/SchemaDiffConfigStep.vue
@@ -472,14 +472,7 @@ async function loadDatabases(connectionId: string, side: "source" | "target") {
   try {
     await store.ensureConnected(connectionId);
     const config = store.getConfig(connectionId);
-    let dbNames: string[];
-    if (config?.db_type === "dameng") {
-      // 达梦的"数据库"概念对应 schema，使用 fetchNamespaceOptionsForConnection
-      dbNames = await fetchNamespaceOptionsForConnection(connectionId, config);
-    } else {
-      const dbs = await api.listDatabases(connectionId);
-      dbNames = Array.isArray(dbs) ? dbs.map((db: any) => (typeof db === "string" ? db : db.name || db.database)) : [];
-    }
+    const dbNames = config ? await fetchNamespaceOptionsForConnection(connectionId, config) : (await api.listDatabases(connectionId)).map((db) => db.name);
     if (side === "source") {
       sourceDatabases.value = dbNames;
       if (props.sourceDatabase) {
diff --git a/apps/desktop/src/components/diff/__tests__/SchemaDiffConfigStep.namespace.spec.ts b/apps/desktop/src/components/diff/__tests__/SchemaDiffConfigStep.namespace.spec.ts
new file mode 100644
index 0000000000..5649de8b3e
--- /dev/null
+++ b/apps/desktop/src/components/diff/__tests__/SchemaDiffConfigStep.namespace.spec.ts
@@ -0,0 +1,84 @@
+// @vitest-environment happy-dom
+
+import { createApp, defineComponent, h, nextTick, type App } from "vue";
+import { afterEach, expect, it, vi } from "vitest";
+import i18n from "@/i18n";
+import { getDefaultOptionsForDbType } from "@/types/schemaDiff";
+import SchemaDiffConfigStep from "@/components/diff/SchemaDiffConfigStep.vue";
+
+const mocks = vi.hoisted(() => ({
+  ensureConnected: vi.fn().mockResolvedValue(undefined),
+  listDatabases: vi.fn().mockResolvedValue([]),
+  listSchemas: vi.fn().mockResolvedValue(["APP", "REPORTING"]),
+}));
+
+vi.mock("@/stores/connectionStore", () => {
+  const connection = { id: "oracle-11g", name: "Oracle 11g", db_type: "oracle", driver_profile: "oracle", database: "XE" };
+  return {
+    useConnectionStore: () => ({
+      connections: [connection],
+      sidebarLayout: { groups: [], order: [{ type: "connection", id: connection.id }] },
+      getConfig: (id: string) => (id === connection.id ? connection : undefined),
+      ensureConnected: mocks.ensureConnected,
+    }),
+  };
+});
+
+vi.mock("@/lib/backend/api", () => ({
+  listDatabases: mocks.listDatabases,
+  listSchemas: mocks.listSchemas,
+}));
+
+const mountedApps: App[] = [];
+
+async function flushAsyncSetup() {
+  for (let index = 0; index < 8; index += 1) {
+    await nextTick();
+    await new Promise((resolve) => setTimeout(resolve, 0));
+  }
+}
+
+afterEach(() => {
+  for (const app of mountedApps.splice(0)) app.unmount();
+  document.body.textContent = "";
+  vi.clearAllMocks();
+});
+
+it("offers Oracle schemas as schema-diff database choices", async () => {
+  const container = document.createElement("div");
+  document.body.append(container);
+  const app = createApp(
+    defineComponent({
+      setup: () => () =>
+        h(SchemaDiffConfigStep, {
+          configs: [],
+          activeConfigId: "",
+          sourceConnectionId: "oracle-11g",
+          sourceDatabase: "",
+          sourceSchema: "",
+          targetConnectionId: "",
+          targetDatabase: "",
+          targetSchema: "",
+          ignoreComments: false,
+          options: getDefaultOptionsForDbType("oracle"),
+          tableListLoader: { load: vi.fn().mockResolvedValue([]) },
+          loading: false,
+          recentConfigs: [],
+        }),
+    }),
+  );
+  mountedApps.push(app);
+  app.use(i18n);
+  app.mount(container);
+  await flushAsyncSetup();
+
+  const sourceDatabase = document.querySelector<HTMLButtonElement>("button.dbx-searchable-select-trigger");
+  expect(sourceDatabase?.disabled).toBe(false);
+  sourceDatabase?.click();
+  await flushAsyncSetup();
+
+  const options = [...document.querySelectorAll<HTMLButtonElement>(".dbx-searchable-select-list button")].map((button) => button.textContent?.trim());
+  expect(options).toEqual(expect.arrayContaining(["APP", "REPORTING"]));
+  expect(mocks.listDatabases).not.toHaveBeenCalled();
+  expect(mocks.listSchemas).toHaveBeenCalledWith("oracle-11g", "XE", true);
+});