diff --git a/webapp/packages/core/assets/locales/en.js b/webapp/packages/core/assets/locales/en.js
index ba9bf6716e..7544839116 100644
--- a/webapp/packages/core/assets/locales/en.js
+++ b/webapp/packages/core/assets/locales/en.js
@@ -32,10 +32,15 @@ module.exports = {
   data_transfer_dialog_export: 'Export',
   data_transfer_dialog_exporting_object: 'Exporting:',
   data_transfer_dialog_configuration_title: 'Export configuration',
+  data_transfer_dialog_preparation: 'We prepare your file for export. Please wait...',
+  data_transfer_notification_preparation: 'We prepare your file for download. Please wait...',
+  data_transfer_notification_ready: 'File ready to download',
+  data_transfer_notification_error: 'Preparation failed or canceled',
 
   ui_stepper_back: 'Back',
   ui_processing_loading: 'Loading...',
   ui_processing_cancel: 'Cancel',
+  ui_processing_canceling: 'Canceling...',
   ui_processing_retry: 'Retry',
   ui_error_message: 'Error:',
   ui_errors_details: 'Details',
diff --git a/webapp/packages/core/assets/locales/ru.js b/webapp/packages/core/assets/locales/ru.js
index f293429a94..5c32d5cdbc 100644
--- a/webapp/packages/core/assets/locales/ru.js
+++ b/webapp/packages/core/assets/locales/ru.js
@@ -31,10 +31,15 @@ module.exports = {
   data_transfer_dialog_export: 'Экспортировать',
   data_transfer_dialog_exporting_object: 'Экспортировать:',
   data_transfer_dialog_configuration_title: 'Настройка экспорта',
+  data_transfer_dialog_preparation: 'Подготавливаем файл к экспорту. Пожалуйста подождите...',
+  data_transfer_notification_preparation: 'Подготавливаем файл к загрузке. Пожалуйста подождите...',
+  data_transfer_notification_ready: 'Файл готов к загрузке',
+  data_transfer_notification_error: 'Подготовка файла к загрузке не удалась или была отменена',
 
   ui_stepper_back: 'Назад',
   ui_processing_loading: 'Загрузка...',
   ui_processing_cancel: 'Отменить',
+  ui_processing_canceling: 'Отмена...',
   ui_processing_retry: 'Повторить',
   ui_error_message: 'Ошибка:',
   ui_errors_details: 'Информация',
diff --git a/webapp/packages/core/src/app/Notifications/NotificationsItem/NotificationItemController.ts b/webapp/packages/core/src/app/Notifications/NotificationsItem/NotificationItemController.ts
index 919b488d79..7cb58aa34b 100644
--- a/webapp/packages/core/src/app/Notifications/NotificationsItem/NotificationItemController.ts
+++ b/webapp/packages/core/src/app/Notifications/NotificationsItem/NotificationItemController.ts
@@ -20,18 +20,18 @@ const FadeTimeout = 5000;
 export class NotificationItemController implements IInitializableController {
   closeAfter = 0;
   @observable isDetailsDialogOpen = false;
-  private notification!: INotification;
+  private notification!: INotification<any>;
 
   constructor(private commonDialogService: CommonDialogService) {}
 
-  init(notification: INotification) {
+  init(notification: INotification<any>) {
     this.notification = notification;
 
     if (this.notification.details) {
       this.handleShowDetails = this.showDetails.bind(this);
     }
 
-    if (notification.type !== ENotificationType.Error) {
+    if (notification.type !== ENotificationType.Error && !notification.persistent) {
       this.closeAfter = FadeTimeout;
     }
   }
diff --git a/webapp/packages/core/src/app/Notifications/NotificationsItem/NotificationsItem.tsx b/webapp/packages/core/src/app/Notifications/NotificationsItem/NotificationsItem.tsx
index 7c7750f108..85169e5aa0 100644
--- a/webapp/packages/core/src/app/Notifications/NotificationsItem/NotificationsItem.tsx
+++ b/webapp/packages/core/src/app/Notifications/NotificationsItem/NotificationsItem.tsx
@@ -15,7 +15,7 @@ import { NotificationItemController } from './NotificationItemController';
 import { Snackbar } from './Snackbar/Snackbar';
 
 type NotificationProps = {
-  notification: INotification;
+  notification: INotification<any>;
 }
 
 export const NotificationsItem = observer(function Notification({ notification }: NotificationProps) {
@@ -24,6 +24,11 @@ export const NotificationsItem = observer(function Notification({ notification }
   }
   const controller = useController(NotificationItemController, notification);
 
+  if (notification.customComponent) {
+    const Custom = notification.customComponent();
+    return <Custom notification={notification} onClose={controller.handleClose} />;
+  }
+
   return (
     <Snackbar
       text={notification.title}
diff --git a/webapp/packages/core/src/app/Notifications/NotificationsItem/Snackbar/Snackbar.tsx b/webapp/packages/core/src/app/Notifications/NotificationsItem/Snackbar/Snackbar.tsx
index 5f7fed1f60..d28d344d09 100644
--- a/webapp/packages/core/src/app/Notifications/NotificationsItem/Snackbar/Snackbar.tsx
+++ b/webapp/packages/core/src/app/Notifications/NotificationsItem/Snackbar/Snackbar.tsx
@@ -12,27 +12,33 @@ import styled, { use } from 'reshadow';
 
 import { Icon, Button } from '@dbeaver/core/blocks';
 import { ENotificationType } from '@dbeaver/core/eventsLog';
+import { useTranslate } from '@dbeaver/core/localization';
 import { useStyles } from '@dbeaver/core/theming';
 
 import { NotificationMark } from './NotificationMark';
-import { snackbarStyles } from './styles';
+import { SNACKBAR_STYLES } from './styles';
 
 type SnackbarProps = {
+  type?: ENotificationType;
   text: string;
   closeAfter?: number;
-  type?: ENotificationType;
   disableShowDetails?: boolean;
   onClose?: () => void;
   onShowDetails?: () => void;
 }
 
-export function Snackbar(props: SnackbarProps) {
-  const styles = useStyles(snackbarStyles);
+export function Snackbar({
+  type,
+  text,
+  closeAfter,
+  disableShowDetails,
+  onClose,
+  onShowDetails,
+}: SnackbarProps) {
+  const styles = useStyles(SNACKBAR_STYLES);
   const [mounted, setMounted] = useState(false);
   const [closing, setClosing] = useState(false);
-  const {
-    closeAfter, onClose, onShowDetails, type, text,
-  } = props;
+  const translate = useTranslate();
 
   useEffect(() => {
     setMounted(true);
@@ -72,9 +78,9 @@ export function Snackbar(props: SnackbarProps) {
               type="button"
               mod={['outlined']}
               onClick={onShowDetails}
-              disabled={props.disableShowDetails}
+              disabled={disableShowDetails}
             >
-              Details
+              {translate('ui_errors_details')}
             </Button>
           </actions>
         )}
diff --git a/webapp/packages/core/src/app/Notifications/NotificationsItem/Snackbar/styles.ts b/webapp/packages/core/src/app/Notifications/NotificationsItem/Snackbar/styles.ts
index 1ddf27de36..45f786dc87 100644
--- a/webapp/packages/core/src/app/Notifications/NotificationsItem/Snackbar/styles.ts
+++ b/webapp/packages/core/src/app/Notifications/NotificationsItem/Snackbar/styles.ts
@@ -10,7 +10,7 @@ import { css } from 'reshadow';
 
 import { composes } from '@dbeaver/core/theming';
 
-export const snackbarStyles = composes(
+export const SNACKBAR_STYLES = composes(
   css`
     notification {
       composes: theme-background-surface theme-text-on-surface from global;
diff --git a/webapp/packages/core/src/app/index.ts b/webapp/packages/core/src/app/index.ts
index f468e13079..12b7c79027 100644
--- a/webapp/packages/core/src/app/index.ts
+++ b/webapp/packages/core/src/app/index.ts
@@ -18,6 +18,8 @@ export * from './NavigationTree/NavigationTreeService';
 export * from './NavigationTree/NavigationTreeContextMenuService';
 export * from './shared/ToolsPanel/LogViewTab/LogViewerMenuService';
 export * from './shared/ToolsPanel/LogViewTab/LogViewerService';
+export * from './Notifications/NotificationsItem/Snackbar/styles';
+export * from './Notifications/NotificationsItem/Snackbar/NotificationMark';
 
 // Models
 export * from './shared/NavigationTabs/ITab';
diff --git a/webapp/packages/core/src/app/shared/ConnectionsManager/ConnectionsManagerService.ts b/webapp/packages/core/src/app/shared/ConnectionsManager/ConnectionsManagerService.ts
index 2340cc4b53..7884822bf1 100644
--- a/webapp/packages/core/src/app/shared/ConnectionsManager/ConnectionsManagerService.ts
+++ b/webapp/packages/core/src/app/shared/ConnectionsManager/ConnectionsManagerService.ts
@@ -38,12 +38,25 @@ export type DBSource = Pick<DataSourceInfo, 'id' | 'name' | 'driverId' | 'descri
 export type Connection = Pick<ConnectionInfo, 'id' | 'name' | 'connected' | 'driverId'>
 export type ObjectContainer = Pick<DatabaseObjectInfo, 'name' | 'description' | 'type' | 'features'>
 
+type DBDriversMetadata = {
+  loaded: boolean;
+}
+
 @injectable()
 export class ConnectionsManagerService {
 
   @observable private connectionsMap: Map<string, Connection> = new Map();
-  readonly dbDrivers = new CachedResource(new Map(), this.refreshDriversAsync.bind(this));
-  readonly connectionObjectContainers = new CachedResource(new Map(), this.refreshObjectContainersAsync.bind(this));
+  readonly dbDrivers = new CachedResource(
+    new Map(),
+    this.refreshDriversAsync.bind(this),
+    (_, { loaded }) => loaded,
+    { loaded: false }
+  );
+  readonly connectionObjectContainers = new CachedResource(
+    new Map(),
+    this.refreshObjectContainersAsync.bind(this),
+    this.isObjectContainersLoaded.bind(this)
+  );
 
   @computed get connections(): Connection[] {
     return Array.from(this.connectionsMap.values());
@@ -129,24 +142,36 @@ export class ConnectionsManagerService {
     await this.nodesManagerService.updateRootChildren();
   }
 
+  private isObjectContainersLoaded(
+    data: Map<string, ObjectContainer[]>,
+    metadata: {},
+    connectionId: string,
+    catalogId?: string,
+  ) {
+    return data.has(connectionId);
+  }
+
   private async refreshObjectContainersAsync(
     data: Map<string, ObjectContainer[]>,
-    refresh: boolean,
+    metadata: {},
+    update: boolean,
     connectionId: string,
     catalogId?: string,
   ): Promise<Map<string, ObjectContainer[]>> {
-    if (refresh || !data.has(connectionId)) {
-      const { navGetStructContainers } = await this.graphQLService.gql.navGetStructContainers({
-        connectionId,
-        catalogId,
-      });
-      data.set(connectionId, [...navGetStructContainers.schemaList, ...navGetStructContainers.catalogList]);
-    }
+    const { navGetStructContainers } = await this.graphQLService.gql.navGetStructContainers({
+      connectionId,
+      catalogId,
+    });
+    data.set(connectionId, [...navGetStructContainers.schemaList, ...navGetStructContainers.catalogList]);
 
     return data;
   }
 
-  private async refreshDriversAsync(data: Map<string, DBDriver>): Promise<Map<string, DBDriver>> {
+  private async refreshDriversAsync(
+    data: Map<string, DBDriver>,
+    metadata: DBDriversMetadata,
+    update: boolean
+  ): Promise<Map<string, DBDriver>> {
     const { driverList } = await this.graphQLService.gql.driverList();
 
     data.clear();
@@ -154,7 +179,7 @@ export class ConnectionsManagerService {
     for (const driver of driverList) {
       data.set(driver.id, driver);
     }
-
+    metadata.loaded = true;
     return data;
   }
 
diff --git a/webapp/packages/core/src/blocks/Button.tsx b/webapp/packages/core/src/blocks/Button.tsx
index 797e19ea04..6935875401 100644
--- a/webapp/packages/core/src/blocks/Button.tsx
+++ b/webapp/packages/core/src/blocks/Button.tsx
@@ -12,52 +12,69 @@ import { useStyles, composes } from '@dbeaver/core/theming';
 
 const buttonStyles = composes(
   css`
-  button {
-    composes: theme-button from global;
-  }
-  ripple {
-    composes: theme-button_ripple from global;
-  }
+    Button {
+      composes: theme-button from global;
+    }
+    ripple {
+      composes: theme-button_ripple from global;
+    }
+  `,
+  css`
+    Button {
+      display: flex;
+    }
   `
 );
 
 const buttonMod = {
   raised: composes(
     css`
-    button {
+    Button {
       composes: theme-button_raised from global;
     }
     `
   ),
   unelevated: composes(
     css`
-    button {
+    Button {
       composes: theme-button_unelevated from global;
     }
     `
   ),
   outlined: composes(
     css`
-    button {
+    Button {
       composes: theme-button_outlined from global;
     }
     `
   ),
   secondary: composes(
     css`
-    button {
+    Button {
       composes: theme-button_secondary from global;
     }
     `
   ),
 };
 
-type ButtonProps = React.ButtonHTMLAttributes<HTMLButtonElement> & {
+type ButtonProps = (
+    React.ButtonHTMLAttributes<HTMLButtonElement | HTMLAnchorElement>
+    & React.LinkHTMLAttributes<HTMLLinkElement | HTMLButtonElement>
+  ) & {
   mod?: (keyof typeof buttonMod)[];
+  tag?: 'button' | 'a';
+  href?: string;
+  download?: boolean;
 }
 
-export function Button({ children, mod, ...rest }: ButtonProps) {
+export function Button({
+  children,
+  mod,
+  tag = 'button',
+  ...rest
+}: ButtonProps) {
+  const Button = tag;
   return styled(useStyles(buttonStyles, ...(mod || []).map(mod => buttonMod[mod])))(
-    <button {...rest}><ripple as="div"/>{children}</button>
+    <Button {...rest}><ripple as="div"/>{children}</Button>
   );
 }
diff --git a/webapp/packages/core/src/blocks/Loader/Loader.tsx b/webapp/packages/core/src/blocks/Loader/Loader.tsx
index 086b0ab4a0..e03af3f68f 100644
--- a/webapp/packages/core/src/blocks/Loader/Loader.tsx
+++ b/webapp/packages/core/src/blocks/Loader/Loader.tsx
@@ -20,6 +20,8 @@ export type LoaderProps = {
   loading?: boolean;
   /** disable cancel button */
   cancelDisabled?: boolean;
+  /** hides message */
+  hideMessage?: boolean;
   /** render loader as overlay with white spinner */
   overlay?: boolean;
   /** loader with white spinner */
@@ -38,6 +40,7 @@ const spinnerType = {
 export function Loader({
   cancelDisabled,
   overlay,
+  hideMessage,
   secondary,
   small,
   className,
@@ -66,7 +69,7 @@ export function Loader({
   return styled(useStyles(loaderStyles, ...(overlay ? [overlayStyles] : [])))(
     <loader as="div" className={className} {...use({ small })}>
       <icon as="div"><img src={spinnerURL}/></icon>
-      <message as="div"><Translate token='ui_processing_loading' /></message>
+      {!hideMessage && <message as="div"><Translate token='ui_processing_loading' /></message>}
       {onCancel && (
         <actions as='div'>
           <Button type="button" mod={['unelevated']}
diff --git a/webapp/packages/core/src/eventsLog/INotification.ts b/webapp/packages/core/src/eventsLog/INotification.ts
index 03a442a814..c51075edc1 100644
--- a/webapp/packages/core/src/eventsLog/INotification.ts
+++ b/webapp/packages/core/src/eventsLog/INotification.ts
@@ -11,20 +11,32 @@ export enum ENotificationType {
   Error = 'Error',
 }
 
-export interface INotification {
+export type NotificationComponentProps<T = undefined> = {
+  notification: INotification<T>;
+  onClose: () => void;
+}
+export type NotificationComponent<T = undefined> = React.FunctionComponent<NotificationComponentProps<T>>
+
+export interface INotification<T = undefined> {
   readonly id: number;
   type: ENotificationType;
   title: string;
   message?: string;
   details?: string | Error;
+  persistent: boolean;
   isSilent: boolean;
+  customComponent?: () => NotificationComponent<T>;
+  source: T;
   close: () => void;
   showDetails: () => void;
 }
 
-export interface INotificationOptions {
+export interface INotificationOptions<T = undefined> {
   title: string;
   message?: string;
   details?: string | Error;
   isSilent?: boolean;
+  persistent?: boolean;
+  customComponent?: () => NotificationComponent<T>;
+  source?: T;
 }
diff --git a/webapp/packages/core/src/eventsLog/NotificationService.ts b/webapp/packages/core/src/eventsLog/NotificationService.ts
index 53b7204c32..7b1ec0dac6 100644
--- a/webapp/packages/core/src/eventsLog/NotificationService.ts
+++ b/webapp/packages/core/src/eventsLog/NotificationService.ts
@@ -10,44 +10,47 @@ import { computed } from 'mobx';
 
 import { injectable } from '@dbeaver/core/di';
 import { GQLError, ServerInternalError } from '@dbeaver/core/sdk';
-import { OrderedMap } from '@dbeaver/core/utils';
+import { EntityList } from '@dbeaver/core/utils';
 
 import { ENotificationType, INotification, INotificationOptions } from './INotification';
 
 @injectable()
 export class NotificationService {
-  private notificationList = new OrderedMap<number, INotification>();
+  private notificationList = new EntityList<number, INotification<any>>(({ id }) => id);
   private notificationNextId = 0
 
   /**
    * By default filtered without silent notifications
    */
-  @computed get notifications(): INotification[] {
+  @computed get notifications(): INotification<any>[] {
     return this.notificationList.values
       .filter(notification => !notification.isSilent);
   }
 
-  notify(options: INotificationOptions, type: ENotificationType) {
+  notify<T = never>(options: INotificationOptions<T>, type: ENotificationType) {
     const id = this.notificationNextId++;
 
-    const notification: INotification = {
+    const notification: INotification<T> = {
       id,
       title: options.title,
       message: options.message,
       details: options.details,
       isSilent: !!options.isSilent,
+      persistent: !!options.persistent,
+      customComponent: options.customComponent,
+      source: options.source!,
       type,
       close: this.close.bind(this, id),
       showDetails: this.showDetails.bind(this, id),
     };
-    this.notificationList.add(notification.id, notification);
+    this.notificationList.set(notification);
   }
 
-  logInfo(notification: INotificationOptions) {
+  logInfo<T>(notification: INotificationOptions<T>) {
     this.notify(notification, ENotificationType.Info);
   }
 
-  logError(notification: INotificationOptions) {
+  logError<T>(notification: INotificationOptions<T>) {
     this.notify(notification, ENotificationType.Error);
   }
 
diff --git a/webapp/packages/core/src/root/ServerService.ts b/webapp/packages/core/src/root/ServerService.ts
index 3ac6c500bb..6dde91fc2b 100644
--- a/webapp/packages/core/src/root/ServerService.ts
+++ b/webapp/packages/core/src/root/ServerService.ts
@@ -15,7 +15,7 @@ import { SessionService } from './SessionService';
 
 @injectable()
 export class ServerService {
-  readonly config = new CachedResource(undefined, this.refreshConfigAsync.bind(this));
+  readonly config = new CachedResource(undefined, this.refreshConfigAsync.bind(this), data => !!data);
   readonly settings = new ServerSettingsService(this.sessionService.settings);
 
   private lastConfig: any = null
@@ -26,10 +26,6 @@ export class ServerService {
   }
 
   private async refreshConfigAsync(data: ServerConfig | undefined): Promise<ServerConfig> {
-    if (data) {
-      return data;
-    }
-
     const { serverConfig } = await this.graphQLService.gql.serverConfig();
 
     if (serverConfig.productConfiguration !== this.lastConfig) {
diff --git a/webapp/packages/core/src/root/SessionService.ts b/webapp/packages/core/src/root/SessionService.ts
index a7e9e1528c..2084f6baba 100644
--- a/webapp/packages/core/src/root/SessionService.ts
+++ b/webapp/packages/core/src/root/SessionService.ts
@@ -19,16 +19,12 @@ export type SessionState = Pick<SessionInfo, 'id' | 'createTime' | 'cacheExpired
 
 @injectable()
 export class SessionService {
-  readonly session = new CachedResource(undefined, this.refreshSessionStateAsync.bind(this));
+  readonly session = new CachedResource(undefined, this.refreshSessionStateAsync.bind(this), data => !!data);
   readonly settings = new SessionSettingsService('session_settings');
 
   constructor(private graphQLService: GraphQLService) {}
 
   private async refreshSessionStateAsync(data: SessionState | undefined): Promise<SessionState> {
-    if (data) {
-      return data;
-    }
-
     const { session } = await this.graphQLService.gql.openSession();
 
     return session;
diff --git a/webapp/packages/core/src/sdk/CachedResource.ts b/webapp/packages/core/src/sdk/CachedResource.ts
index bef342ba51..87cec251fe 100644
--- a/webapp/packages/core/src/sdk/CachedResource.ts
+++ b/webapp/packages/core/src/sdk/CachedResource.ts
@@ -8,24 +8,42 @@
 
 import { observable } from 'mobx';
 
-export type Loader<TData, TArgs extends any[]> = (current: TData, update: boolean, ...args: TArgs) => Promise<TData>
+export type Loader<TData, TMetadata = {}, TArgs extends any[] = []> = (
+  current: TData,
+  metadata: TMetadata,
+  update: boolean,
+  ...args: TArgs
+) => Promise<TData>
 
-export class CachedResource<TData, TArgs extends any[] = []> {
+export type IsLoaded<TData, TMetadata = {}, TArgs extends any[] = []> = (
+  current: TData,
+  metadata: TMetadata,
+  ...args: TArgs
+) => boolean
+
+export class CachedResource<TData, TMetadata = {}, TArgs extends any[] = []> {
   @observable data: TData;
 
-  @observable private loaded = false;
   @observable private loading = false;
-  private refreshPromise: Promise<TData> | null = null;
-  private singleElementPromise: Promise<TData> | null = null;
-  private loader: Loader<TData, TArgs>;
+  @observable private metadata: TMetadata;
+  private loader: Loader<TData, TMetadata, TArgs>;
+  private isLoadedCheck: IsLoaded<TData, TMetadata, TArgs>;
+  private activePromise: Promise<TData> | null = null;
 
-  constructor(defaultValue: TData, loader: Loader<TData, TArgs>) {
+  constructor(
+    defaultValue: TData,
+    loader: Loader<TData, TMetadata, TArgs>,
+    isLoadedCheck: IsLoaded<TData, TMetadata, TArgs>,
+    metadata?: TMetadata,
+  ) {
     this.data = defaultValue;
     this.loader = loader;
+    this.isLoadedCheck = isLoadedCheck;
+    this.metadata = metadata || {} as TMetadata;
   }
 
-  isLoaded(): boolean {
-    return this.loaded;
+  isLoaded(...args: TArgs): boolean {
+    return this.isLoadedCheck(this.data, this.metadata, ...args);
   }
 
   isLoading(): boolean {
@@ -33,64 +51,44 @@ export class CachedResource<TData, TArgs extends any[] = []> {
   }
 
   async refresh(...args: TArgs): Promise<TData> {
-    if (args.length > 0) {
-      await this.loadSingle(true, args);
-    } else {
-      await this.loadAll(true, args);
-    }
-    return this.data;
+    return this.loadAll(true, args);
   }
 
   async load(...args: TArgs): Promise<TData> {
-    if (!this.loaded) {
-      if (args.length > 0) {
-        await this.loadSingle(false, args);
-      } else {
-        await this.loadAll(false, args);
-      }
-    }
-    return this.data;
+    return this.loadAll(false, args);
   }
 
   private async loadAll(update: boolean, args: TArgs) {
-    if (this.refreshPromise) {
-      return this.refreshPromise;
-    }
-    this.refreshPromise = this.loadingTask(update, args);
+    await this.waitActive();
+    this.activePromise = this.loadingTask(update, args);
     try {
-      await this.refreshPromise;
+      return await this.activePromise;
     } finally {
-      this.refreshPromise = null;
-    }
-  }
-
-  private async loadSingle(update: boolean, args: TArgs) {
-    if (this.singleElementPromise) {
-      return this.singleElementPromise;
-    }
-    this.singleElementPromise = this.loadingTask(update, args);
-    try {
-      await this.singleElementPromise;
-    } finally {
-      this.singleElementPromise = null;
+      this.activePromise = null;
     }
   }
 
   private async loadingTask(update: boolean, args: TArgs): Promise<TData> {
-    if (args.length === 0) {
-      this.loaded = false;
-    }
     this.loading = true;
 
     try {
-      this.data = await this.loader(this.data, update, ...args);
+      if (this.isLoaded(...args) && !update) {
+        return this.data;
+      }
+
+      this.data = await this.loader(this.data, this.metadata, update, ...args);
     } finally {
       this.loading = false;
     }
 
-    if (args.length === 0) {
-      this.loaded = true;
-    }
     return this.data;
   }
+
+  private async waitActive() {
+    if (this.activePromise) {
+      try {
+        await this.activePromise;
+      } catch {}
+    }
+  }
 }
diff --git a/webapp/packages/core/src/utils/EntityList.ts b/webapp/packages/core/src/utils/EntityList.ts
new file mode 100644
index 0000000000..b03a94bae6
--- /dev/null
+++ b/webapp/packages/core/src/utils/EntityList.ts
@@ -0,0 +1,54 @@
+/*
+ * cloudbeaver - Cloud Database Manager
+ * Copyright (C) 2020 DBeaver Corp and others
+ *
+ * Licensed under the Apache License, Version 2.0.
+ * you may not use this file except in compliance with the License.
+ */
+
+import { action, computed, observable } from 'mobx';
+
+export class EntityList<K, V> {
+  private identifiers = observable.array<K>([]);
+  @observable private map: Map<K, V> = new Map<K, V>();
+
+  @computed get keys(): K[] {
+    return this.identifiers;
+  }
+
+  @computed get values(): V[] {
+    return this.identifiers.map(i => this.map.get(i)!);
+  }
+
+  constructor(private keySelector: (val: V) => K) { }
+
+  get(key: K): V | undefined {
+    return this.map.get(key);
+  }
+
+  has(key: K): boolean {
+    return this.map.has(key);
+  }
+
+  @action
+  set(value: V): void {
+    const key = this.keySelector(value);
+    this.identifiers.push(key);
+    this.map.set(key, value);
+  }
+
+  @action
+  remove(key: K): void {
+    if (!this.map.has(key)) {
+      return;
+    }
+    this.map.delete(key);
+    this.identifiers.remove(key);
+  }
+
+  @action
+  clear(): void {
+    this.identifiers.clear();
+    this.map.clear();
+  }
+}
diff --git a/webapp/packages/core/src/utils/index.ts b/webapp/packages/core/src/utils/index.ts
index 691f2e3807..f7897e5dcd 100644
--- a/webapp/packages/core/src/utils/index.ts
+++ b/webapp/packages/core/src/utils/index.ts
@@ -1,6 +1,7 @@
 export * from './OrderedMap';
 export * from './uuid';
 export * from './parseJSONFlat';
+export * from './EntityList';
 
 export * from './Promises/CancellablePromise';
 export * from './Promises/Deferred';
diff --git a/webapp/packages/data-export-plugin/src/DataExportService.ts b/webapp/packages/data-export-plugin/src/DataExportService.ts
index 8fa42dd286..5458effd7a 100644
--- a/webapp/packages/data-export-plugin/src/DataExportService.ts
+++ b/webapp/packages/data-export-plugin/src/DataExportService.ts
@@ -6,7 +6,9 @@
  * you may not use this file except in compliance with the License.
  */
 
+import { ErrorDetailsDialog } from '@dbeaver/core/app';
 import { injectable } from '@dbeaver/core/di';
+import { CommonDialogService } from '@dbeaver/core/dialogs';
 import { NotificationService } from '@dbeaver/core/eventsLog';
 import {
   CachedResource, GraphQLService, DataTransferProcessorInfo, DataTransferParameters
@@ -15,15 +17,25 @@ import { Deferred } from '@dbeaver/core/utils';
 
 import { ExportFromContainerProcess } from './ExportFromContainerProcess';
 import { ExportFromResultsProcess } from './ExportFromResultsProcess';
+import { PendingNotification } from './PendingNotification';
+
+type ProcessorsResourceMetadata = {
+  loaded: boolean;
+}
 
 @injectable()
 export class DataExportService {
-  readonly processors = new CachedResource(new Map(), this.refreshProcessorsAsync.bind(this));
-  private exportProcesses = new Map<string, Deferred<string>>();
+  readonly processors = new CachedResource(
+    new Map(),
+    this.refreshProcessorsAsync.bind(this),
+    (_, { loaded }) => loaded
+  );
+  readonly exportProcesses = new Map<string, Deferred<string>>();
 
   constructor(
     private graphQLService: GraphQLService,
-    private notificationService: NotificationService
+    private notificationService: NotificationService,
+    private commonDialogService: CommonDialogService,
   ) { }
 
   async cancel(exportId: string) {
@@ -46,7 +58,19 @@ export class DataExportService {
     try {
       await this.graphQLService.gql.removeDataTransferFile({ dataFileId });
       this.exportProcesses.delete(exportId);
-    } catch (e) {
+    } catch (exception) {
+      this.notificationService.logException(exception, 'Error occurred while deleting file');
+    }
+  }
+
+  async showDetails(exportId: string) {
+    const process = this.exportProcesses.get(exportId);
+    if (!process) {
+      return;
+    }
+    try {
+      await this.commonDialogService.open(ErrorDetailsDialog, process.getRejectionReason());
+    } finally {
     }
   }
 
@@ -60,6 +84,17 @@ export class DataExportService {
       return;
     }
     this.exportProcesses.delete(exportId);
+  }
+
+  downloadUrl(exportId: string) {
+    const process = this.exportProcesses.get(exportId);
+    if (!process) {
+      return;
+    }
+    const dataFileId = process.getPayload();
+    if (!dataFileId) {
+      return;
+    }
     return `/dbeaver/data/${dataFileId}`;
   }
 
@@ -72,9 +107,7 @@ export class DataExportService {
     const taskId = await process.start(connectionId, containerNodePath, parameters);
     if (taskId) {
       this.exportProcesses.set(taskId, process);
-      // this.notificationService.logInfo({ title: 'We prepare your file for export. Please wait' });
-      await process.promise;
-      window.open(this.download(taskId), '_blank');
+      this.showPendingNotification(taskId);
       return taskId;
     }
   }
@@ -89,14 +122,22 @@ export class DataExportService {
     const taskId = await process.start(connectionId, contextId, resultsId, parameters);
     if (taskId) {
       this.exportProcesses.set(taskId, process);
-      await process.promise;
-      window.open(this.download(taskId), '_blank');
+      this.showPendingNotification(taskId);
       return taskId;
     }
   }
 
+  private showPendingNotification(taskId: string) {
+    this.notificationService.logInfo({
+      title: 'We prepare your file for export. Please wait',
+      source: taskId,
+      customComponent: () => PendingNotification,
+    });
+  }
+
   private async refreshProcessorsAsync(
-    data: Map<string, DataTransferProcessorInfo>
+    data: Map<string, DataTransferProcessorInfo>,
+    metadata: ProcessorsResourceMetadata,
   ): Promise<Map<string, DataTransferProcessorInfo>> {
     const { processors } = await this.graphQLService.gql.getDataTransferProcessors();
 
@@ -105,7 +146,7 @@ export class DataExportService {
     for (const processor of processors) {
       data.set(processor.id, processor);
     }
-
+    metadata.loaded = true;
     return data;
   }
 }
diff --git a/webapp/packages/data-export-plugin/src/Dialog/DataExportController.ts b/webapp/packages/data-export-plugin/src/Dialog/DataExportController.ts
index cc1bb871f7..8c0452e4cd 100644
--- a/webapp/packages/data-export-plugin/src/Dialog/DataExportController.ts
+++ b/webapp/packages/data-export-plugin/src/Dialog/DataExportController.ts
@@ -38,7 +38,7 @@ export class DataExportController implements IInitializableController {
       .sort((a, b) => this.sortProcessors(a, b));
   }
 
-  @observable readonly processorProperties: any = {}
+  @observable processorProperties: any = {}
   @observable properties: IProperty[] = []
 
   private context!: IExportContext;
@@ -108,6 +108,9 @@ export class DataExportController implements IInitializableController {
       validValues: property.validValues,
       defaultValue: property.defaultValue,
     })) || [];
+
+    this.processorProperties = {};
+
     this.step = DataExportStep.Configure;
   }
 
diff --git a/webapp/packages/data-export-plugin/src/Dialog/ProcessorConfigureDialog.tsx b/webapp/packages/data-export-plugin/src/Dialog/ProcessorConfigureDialog.tsx
index 5b7f952cc8..1e8ea520cf 100644
--- a/webapp/packages/data-export-plugin/src/Dialog/ProcessorConfigureDialog.tsx
+++ b/webapp/packages/data-export-plugin/src/Dialog/ProcessorConfigureDialog.tsx
@@ -9,7 +9,7 @@
 import { observer } from 'mobx-react';
 import styled, { css } from 'reshadow';
 
-import { Loader, IProperty, PropertiesTable } from '@dbeaver/core/blocks';
+import { IProperty, PropertiesTable } from '@dbeaver/core/blocks';
 import { CommonDialogWrapper } from '@dbeaver/core/dialogs';
 import { useTranslate } from '@dbeaver/core/localization';
 import { DataTransferProcessorInfo } from '@dbeaver/core/sdk';
@@ -49,7 +49,8 @@ export const ProcessorConfigureDialog = observer(
     onBack,
     onExport,
   }: ProcessorSelectDialogProps) {
-    const title = `${useTranslate('data_transfer_dialog_configuration_title')} (${processor.name})`;
+    const translate = useTranslate();
+    const title = `${translate('data_transfer_dialog_configuration_title')} (${processor.name})`;
 
     return styled(styles)(
       <CommonDialogWrapper
@@ -65,7 +66,7 @@ export const ProcessorConfigureDialog = observer(
         }
         onReject={onClose}
       >
-        {isExporting && <message as="div">We prepare your file for export. Please wait...</message>}
+        {isExporting && <message as="div">{translate('data_transfer_dialog_preparation')}</message>}
         {!isExporting && (
           <PropertiesTable
             properties={properties}
diff --git a/webapp/packages/data-export-plugin/src/PendingNotification.tsx b/webapp/packages/data-export-plugin/src/PendingNotification.tsx
new file mode 100644
index 0000000000..f446ab3878
--- /dev/null
+++ b/webapp/packages/data-export-plugin/src/PendingNotification.tsx
@@ -0,0 +1,162 @@
+/*
+ * cloudbeaver - Cloud Database Manager
+ * Copyright (C) 2020 DBeaver Corp and others
+ *
+ * Licensed under the Apache License, Version 2.0.
+ * you may not use this file except in compliance with the License.
+ */
+
+import { observer } from 'mobx-react';
+import {
+  useEffect, useState, useCallback
+} from 'react';
+import { Button as ReakitButton } from 'reakit/Button';
+import styled, { use, css } from 'reshadow';
+
+import { SNACKBAR_STYLES } from '@dbeaver/core/app';
+import { Icon, Button, Loader } from '@dbeaver/core/blocks';
+import { useService } from '@dbeaver/core/di';
+import { NotificationComponentProps } from '@dbeaver/core/eventsLog';
+import { useTranslate } from '@dbeaver/core/localization';
+import { useStyles } from '@dbeaver/core/theming';
+import { EDeferredState } from '@dbeaver/core/utils';
+
+import { DataExportService } from './DataExportService';
+
+const styles = css`
+  Loader {
+    margin-right: 16px;
+  }
+  actions {
+    display: flex;
+  }
+  fill {
+    flex: 1;
+  }
+  Button {
+    margin-left: 16px !important;
+  }
+  actions Button {
+    display: flex;
+  }
+`;
+
+export const PendingNotification = observer(function PendingNotification({
+  notification,
+  onClose,
+}: NotificationComponentProps<string>) {
+  const translate = useTranslate();
+  const dataExportService = useService(DataExportService);
+  const task = dataExportService.exportProcesses.get(notification.source);
+  if (!task) {
+    return null;
+  }
+  const [mounted, setMounted] = useState(false);
+  const [idDetailsOpen, setDetails] = useState(false);
+
+  const getDownloadUrl = useCallback(
+    () => dataExportService.downloadUrl(notification.source),
+    [dataExportService, notification]
+  );
+
+  const handleDelete = useCallback(() => {
+    dataExportService.delete(notification.source);
+    onClose();
+  }, [dataExportService, notification, onClose]);
+
+  const handleDownload = useCallback(() => {
+    dataExportService.download(notification.source);
+    onClose();
+  }, [dataExportService, notification, onClose]);
+
+  const handleCancel = useCallback(() => {
+    dataExportService.cancel(notification.source);
+  }, [dataExportService, notification]);
+
+  const handleDetails = useCallback(async () => {
+    try {
+      setDetails(true);
+      await dataExportService.showDetails(notification.source);
+    } finally {
+      setDetails(false);
+    }
+  }, [dataExportService, notification]);
+
+  useEffect(() => {
+    setMounted(true);
+  }, []);
+
+  const status = useCallback(() => {
+    switch (task.getState()) {
+      case EDeferredState.PENDING:
+        return translate('data_transfer_notification_preparation');
+      case EDeferredState.CANCELLING:
+        return translate('ui_processing_canceling');
+      case EDeferredState.RESOLVED:
+        return translate('data_transfer_notification_ready');
+      default:
+        return translate('data_transfer_notification_error');
+    }
+  }, [task]);
+
+  const isSuccess = task.getState() === EDeferredState.RESOLVED;
+
+  return styled(useStyles(SNACKBAR_STYLES, styles))(
+    <notification as="div" {...use({ mounted })} >
+      <notification-header as="div">
+        <Loader loading={task.isInProgress} hideMessage />
+        <message as="div">{status()}</message>
+        {task.isFinished && (
+          <ReakitButton onClick={handleDelete}>
+            <Icon name="cross" viewBox="0 0 16 16" />
+          </ReakitButton>
+        )}
+      </notification-header>
+      <notification-body as="div">
+        <actions as="div">
+          <fill as="div" />
+          {task.isFinished && isSuccess && (
+            <>
+              <Button
+                type="button"
+                mod={['outlined']}
+                onClick={handleDelete}
+              >
+                Delete
+              </Button>
+              <Button
+                type="button"
+                tag='a'
+                href={getDownloadUrl()}
+                mod={['unelevated']}
+                onClick={handleDownload}
+                download
+              >
+                Download
+              </Button>
+            </>
+          )}
+          {task.isFinished && !isSuccess && (
+            <Button
+              type="button"
+              mod={['outlined']}
+              onClick={handleDetails}
+              disabled={idDetailsOpen}
+            >
+              {translate('ui_errors_details')}
+            </Button>
+          )}
+          {!task.isFinished && (
+            <Button
+              type="button"
+              mod={['outlined']}
+              onClick={handleCancel}
+            >
+              {translate('ui_processing_cancel')}
+            </Button>
+          )}
+        </actions>
+      </notification-body>
+    </notification>
+  );
+});