diff --git a/frontend/src/components/DataViewer.primary-key.test.tsx b/frontend/src/components/DataViewer.primary-key.test.tsx
index 5759daa0..4230d4ec 100644
--- a/frontend/src/components/DataViewer.primary-key.test.tsx
+++ b/frontend/src/components/DataViewer.primary-key.test.tsx
@@ -606,6 +606,58 @@ describe('DataViewer safe editing locator', () => {
     renderer!.unmount();
   });
 
+  it('recounts the known total when table data shrinks after a manual refresh', async () => {
+    storeState.connections[0].config.type = 'mysql';
+    storeState.connections[0].config.database = 'main';
+    backendApp.DBGetColumns.mockResolvedValue({
+      success: true,
+      data: [{ name: 'ID', key: 'PRI' }, { name: 'NAME', key: '' }],
+    });
+
+    let countQueryCount = 0;
+    backendApp.DBQuery.mockImplementation(async (_config: any, _dbName: string, sql: string) => {
+      if (/count\s*\(/i.test(String(sql))) {
+        countQueryCount += 1;
+        return {
+          success: true,
+          fields: ['total'],
+          data: [{ total: countQueryCount === 1 ? 500 : 430 }],
+        };
+      }
+      return {
+        success: true,
+        fields: ['ID', 'NAME'],
+        data: createRows(101),
+      };
+    });
+
+    let renderer: ReactTestRenderer;
+    await act(async () => {
+      renderer = create(<DataViewer tab={createTab({ dbName: 'main', tableName: 'users', title: 'users' })} />);
+    });
+    await flushPromises();
+
+    expect(dataGridState.latestProps?.pagination).toMatchObject({
+      total: 500,
+      totalKnown: true,
+    });
+
+    await act(async () => {
+      dataGridState.latestProps?.onReload();
+      await Promise.resolve();
+      await Promise.resolve();
+    });
+    await flushPromises();
+
+    expect(countQueryCount).toBe(2);
+    expect(dataGridState.latestProps?.pagination).toMatchObject({
+      total: 430,
+      totalKnown: true,
+    });
+    expect(dataGridState.latestProps?.data).toHaveLength(100);
+    renderer!.unmount();
+  });
+
   it('shows an actionable message for DuckDB timeout interruption errors', async () => {
     storeState.languagePreference = 'en-US';
     storeState.connections[0].config.type = 'duckdb';
diff --git a/frontend/src/components/DataViewer.tsx b/frontend/src/components/DataViewer.tsx
index e03555c3..bb7de2c0 100644
--- a/frontend/src/components/DataViewer.tsx
+++ b/frontend/src/components/DataViewer.tsx
@@ -583,7 +583,8 @@ const DataViewer: React.FC<{ tab: TabData; isActive?: boolean }> = React.memo(({
     setPagination(prev => ({ ...prev, totalCountLoading: false, totalCountCancelled: true }));
   }, []);
 
-  const fetchData = useCallback(async (page = pagination.current, size = pagination.pageSize) => {
+  const fetchData = useCallback(async (page = pagination.current, size = pagination.pageSize, options?: { refreshTotal?: boolean }) => {
+    const refreshTotal = options?.refreshTotal === true;
     const seq = ++fetchSeqRef.current;
     setLoading(true);
     const conn = connections.find(c => c.id === tab.connectionId);
@@ -717,15 +718,16 @@ const DataViewer: React.FC<{ tab: TabData; isActive?: boolean }> = React.memo(({
       : buildOrderBySQL(dbType, sortInfo, resolveDataViewerOrderFallbackColumns(editLocatorForQuery, pkColumnsForQuery));
     const totalRows = Number(pagination.total);
     const hasFiniteTotal = Number.isFinite(totalRows) && totalRows >= 0;
-    const totalKnown = pagination.totalKnown && hasFiniteTotal;
+    const totalKnown = !refreshTotal && pagination.totalKnown && hasFiniteTotal;
     const approximateTotalRows = Number(pagination.approximateTotal);
     const hasApproximateTotalPages =
+      !refreshTotal &&
       !totalKnown &&
       supportsApproximateTotalPages &&
       pagination.totalApprox &&
       Number.isFinite(approximateTotalRows) &&
       approximateTotalRows > 0;
-    const effectiveTotalRows = hasApproximateTotalPages ? approximateTotalRows : totalRows;
+    const effectiveTotalRows = hasApproximateTotalPages ? approximateTotalRows : (refreshTotal ? 0 : totalRows);
     const totalPages = Number.isFinite(effectiveTotalRows) && effectiveTotalRows > 0 ? Math.max(1, Math.ceil(effectiveTotalRows / size)) : 0;
     const currentPage = totalPages > 0 ? Math.min(Math.max(1, page), totalPages) : Math.max(1, page);
     const offset = (currentPage - 1) * size;
@@ -1141,7 +1143,24 @@ const DataViewer: React.FC<{ tab: TabData; isActive?: boolean }> = React.memo(({
     void fetchData(pagination.current, pagination.pageSize);
   }, [fetchData, pagination.current, pagination.pageSize]);
   const handleReload = useCallback(() => {
-    fetchData(pagination.current, pagination.pageSize);
+    countSeqRef.current++;
+    manualCountSeqRef.current++;
+    duckdbApproxSeqRef.current++;
+    oracleApproxSeqRef.current++;
+    countKeyRef.current = '';
+    autoCountKeyRef.current = '';
+    manualCountKeyRef.current = '';
+    duckdbApproxKeyRef.current = '';
+    oracleApproxKeyRef.current = '';
+    setPagination(prev => ({
+      ...prev,
+      totalKnown: false,
+      totalApprox: false,
+      approximateTotal: undefined,
+      totalCountLoading: false,
+      totalCountCancelled: false,
+    }));
+    fetchData(pagination.current, pagination.pageSize, { refreshTotal: true });
   }, [fetchData, pagination.current, pagination.pageSize]);
   const handleSort = useCallback((field: string, order: string) => {
     // 支持多字段排序：field 为 JSON 数组字符串时解析为多字段