diff --git a/frontend/src/components/DataGridPaginationBar.tsx b/frontend/src/components/DataGridPaginationBar.tsx
index 0edcd78..e9a968e 100644
--- a/frontend/src/components/DataGridPaginationBar.tsx
+++ b/frontend/src/components/DataGridPaginationBar.tsx
@@ -1,6 +1,6 @@
 import React from 'react';
 import { Button, InputNumber, Pagination, Select } from 'antd';
-import { LeftOutlined, RightOutlined } from '@ant-design/icons';
+import { CloseOutlined, LeftOutlined, RightOutlined, VerticalAlignBottomOutlined } from '@ant-design/icons';
 import { t as defaultTranslate, type I18nParams } from '../i18n';
 
 interface DataGridPaginationState {
@@ -26,12 +26,31 @@ export interface DataGridPaginationBarProps {
   paginationPageText: string;
   paginationPageSizeOptions: string[];
   showKnownPageCount: boolean;
+  manualTotalCountAvailable?: boolean;
+  totalCountLoading?: boolean;
   onPageChange?: (page: number, size: number) => void;
   onPageSizeChange: (value: string) => void;
   onV2PageStep: (direction: 'previous' | 'next') => void;
+  onToggleTotalCount?: () => void;
   translate?: DataGridPaginationTranslate;
 }
 
+const findToolbarTotalCountButton = (
+  trigger: HTMLElement,
+  labels: string[],
+): HTMLButtonElement | null => {
+  const root = trigger.closest('.data-grid-root') || trigger.ownerDocument?.body;
+  if (!root) return null;
+  const normalizedLabels = labels.map((label) => String(label || '').trim()).filter(Boolean);
+  const buttons = Array.from(root.querySelectorAll('button')) as HTMLButtonElement[];
+  return buttons.find((button) => {
+    if (button === trigger) return false;
+    if (button.disabled) return false;
+    const text = String(button.textContent || '').replace(/\s+/g, ' ').trim();
+    return normalizedLabels.some((label) => text === label || text.includes(label));
+  }) || null;
+};
+
 const DataGridPaginationBar: React.FC<DataGridPaginationBarProps> = ({
   isV2Ui,
   pagination,
@@ -42,9 +61,12 @@ const DataGridPaginationBar: React.FC<DataGridPaginationBarProps> = ({
   paginationPageText,
   paginationPageSizeOptions,
   showKnownPageCount,
+  manualTotalCountAvailable = false,
+  totalCountLoading = false,
   onPageChange,
   onPageSizeChange,
   onV2PageStep,
+  onToggleTotalCount,
   translate = defaultTranslate,
 }) => {
   const [jumpPage, setJumpPage] = React.useState<number | null>(pagination?.current ?? null);
@@ -58,6 +80,37 @@ const DataGridPaginationBar: React.FC<DataGridPaginationBarProps> = ({
     return null;
   }
 
+  const countTotalLabel = translate('data_grid.toolbar.count_total');
+  const cancelCountLabel = translate('data_grid.toolbar.cancel_count');
+  const effectiveTotalCountLoading = totalCountLoading || Boolean(pagination.totalCountLoading);
+  const shouldShowTotalCountButton = Boolean(
+    onToggleTotalCount
+    || manualTotalCountAvailable
+    || pagination.totalCountLoading
+    || pagination.totalKnown === false,
+  );
+  const handleToggleTotalCount = (event: React.MouseEvent<HTMLButtonElement>) => {
+    if (onToggleTotalCount) {
+      onToggleTotalCount();
+      return;
+    }
+    // Backward-compatible bridge for existing DataGridShell callers: the top toolbar already owns
+    // the total-count handler, but it can be horizontally scrolled out of view on large toolbars.
+    // Trigger that existing button so the pagination bar can expose the action without duplicating data-flow state.
+    const toolbarButton = findToolbarTotalCountButton(event.currentTarget, [countTotalLabel, cancelCountLabel]);
+    toolbarButton?.click();
+  };
+  const totalCountButton = shouldShowTotalCountButton ? (
+    <Button
+      data-grid-pagination-total-count="true"
+      size="small"
+      icon={effectiveTotalCountLoading ? <CloseOutlined /> : <VerticalAlignBottomOutlined />}
+      onClick={handleToggleTotalCount}
+    >
+      {effectiveTotalCountLoading ? cancelCountLabel : countTotalLabel}
+    </Button>
+  ) : null;
+
   const maxJumpPage = showKnownPageCount ? Math.max(1, paginationTotalPages) : null;
   const normalizedJumpPage = Number.isFinite(Number(jumpPage)) && Number(jumpPage) > 0
     ? (maxJumpPage !== null
@@ -132,6 +185,7 @@ const DataGridPaginationBar: React.FC<DataGridPaginationBarProps> = ({
           <div className="data-grid-pagination-summary" aria-live="polite">
             <span className="data-grid-pagination-summary-value">{paginationV2SummaryText}</span>
           </div>
+          {totalCountButton}
           <Button
             data-grid-v2-pagination-prev="true"
             size="small"
@@ -174,6 +228,7 @@ const DataGridPaginationBar: React.FC<DataGridPaginationBarProps> = ({
             <span className="data-grid-pagination-kicker">{translate('data_grid.pagination.result_set')}</span>
             <span className="data-grid-pagination-summary-value">{paginationSummaryText}</span>
           </div>
+          {totalCountButton}
           {showSequentialPagination ? sequentialPaginationControl : (
             <Pagination
               current={pagination.current}
diff --git a/frontend/src/components/MonacoEditor.tsx b/frontend/src/components/MonacoEditor.tsx
index ce17b24..7701d8a 100644
--- a/frontend/src/components/MonacoEditor.tsx
+++ b/frontend/src/components/MonacoEditor.tsx
@@ -24,6 +24,140 @@ const sameEditorPosition = (left: any, right: any): boolean => (
   && Number(left?.column) === Number(right?.column)
 );
 
+const stripSqlIdentifierQuotes = (value: string): string => {
+  const text = String(value || '').trim();
+  if (!text) return '';
+  if ((text.startsWith('`') && text.endsWith('`'))
+    || (text.startsWith('"') && text.endsWith('"'))
+    || (text.startsWith('[') && text.endsWith(']'))) {
+    return text.slice(1, -1).trim();
+  }
+  return text;
+};
+
+const splitSqlIdentifierPath = (raw: string): string[] => (
+  String(raw || '')
+    .split('.')
+    .map(stripSqlIdentifierQuotes)
+    .map((part) => part.trim())
+    .filter(Boolean)
+);
+
+const resolveIdentifierWindowAtColumn = (
+  lineContent: string,
+  column: number,
+): { start: number; end: number; text: string } | null => {
+  const text = String(lineContent || '');
+  if (!text) return null;
+  const isIdentChar = (ch: string) => /[A-Za-z0-9_$`"\[\].]/.test(ch || '');
+  let offset = Math.max(0, Math.min(text.length - 1, Number(column || 1) - 2));
+  if (!isIdentChar(text[offset] || '')) {
+    if (offset > 0 && isIdentChar(text[offset - 1] || '')) {
+      offset -= 1;
+    } else if (offset + 1 < text.length && isIdentChar(text[offset + 1] || '')) {
+      offset += 1;
+    } else {
+      return null;
+    }
+  }
+  let start = offset;
+  while (start > 0 && isIdentChar(text[start - 1] || '')) start -= 1;
+  let end = offset + 1;
+  while (end < text.length && isIdentChar(text[end] || '')) end += 1;
+  return start < end ? { start, end, text: text.slice(start, end).trim() } : null;
+};
+
+const isLikelyTableReferenceIdentifier = (
+  lineContent: string,
+  identifierStart: number,
+): boolean => {
+  const beforeIdentifier = String(lineContent || '').slice(0, Math.max(0, identifierStart));
+  return /\b(?:from|join|update|into|delete\s+from|alter\s+table|drop\s+table|truncate\s+table)\s*$/i.test(beforeIdentifier);
+};
+
+const isOceanBaseOracleConnection = (connection: any): boolean => {
+  const config = connection?.config || {};
+  return String(config.type || '').trim().toLowerCase() === 'oceanbase'
+    && String(config.oceanBaseProtocol || '').trim().toLowerCase() === 'oracle';
+};
+
+const installOceanBaseOracleNavigationFallback = (editor: any) => {
+  const editorDomNode = editor?.getDomNode?.();
+  if (!editorDomNode || editor.__gonaviObOracleNavigationFallbackInstalled) {
+    return;
+  }
+  Object.defineProperty(editor, '__gonaviObOracleNavigationFallbackInstalled', {
+    value: true,
+    configurable: true,
+  });
+
+  const handleMouseDownCapture = (event: MouseEvent) => {
+    if (event.button !== 0 || !(event.ctrlKey || event.metaKey) || event.altKey) {
+      return;
+    }
+
+    const store = useStore.getState();
+    const activeTab = (store.tabs || []).find((tab: any) => tab.id === store.activeTabId);
+    if (!activeTab || activeTab.type !== 'query') {
+      return;
+    }
+    const connectionId = String(activeTab.connectionId || store.activeContext?.connectionId || '').trim();
+    if (!connectionId) {
+      return;
+    }
+    const connection = (store.connections || []).find((item: any) => item.id === connectionId);
+    if (!isOceanBaseOracleConnection(connection)) {
+      return;
+    }
+
+    const target = editor.getTargetAtClientPoint?.(event.clientX, event.clientY);
+    const position = target?.position;
+    if (!position) {
+      return;
+    }
+    const model = editor.getModel?.();
+    const lineContent = String(model?.getLineContent?.(position.lineNumber) || '');
+    const identifier = resolveIdentifierWindowAtColumn(lineContent, position.column);
+    if (!identifier || !identifier.text.includes('.')) {
+      return;
+    }
+    if (!isLikelyTableReferenceIdentifier(lineContent, identifier.start)) {
+      return;
+    }
+
+    const parts = splitSqlIdentifierPath(identifier.text);
+    if (parts.length !== 2) {
+      return;
+    }
+    const [schemaName, tableName] = parts;
+    if (!schemaName || !tableName) {
+      return;
+    }
+
+    event.preventDefault();
+    event.stopPropagation();
+    event.stopImmediatePropagation?.();
+    store.setActiveContext?.({ connectionId, dbName: schemaName });
+    store.addTab?.({
+      id: `${connectionId}-${schemaName}-table-${tableName}`,
+      title: tableName,
+      type: 'table',
+      connectionId,
+      dbName: schemaName,
+      tableName,
+      initialViewMode: 'fields',
+      initialViewModeRequestId: String(Date.now()),
+      objectType: 'table',
+      returnToTabId: activeTab.id || undefined,
+    });
+  };
+
+  editorDomNode.addEventListener('mousedown', handleMouseDownCapture, true);
+  editor.onDidDispose?.(() => {
+    editorDomNode.removeEventListener('mousedown', handleMouseDownCapture, true);
+  });
+};
+
 const patchQueryEditorAiInlineRightArrowFallback = (editor: any, monaco: any) => {
   const originalAddCommand = editor?.addCommand?.bind?.(editor);
   if (!originalAddCommand || !monaco?.KeyCode?.RightArrow) {
@@ -154,6 +288,7 @@ const MonacoEditor: React.FC<MonacoEditorProps> = ({
   }, [beforeMount]);
 
   const handleMount: OnMount = useCallback((editor, monaco) => {
+    installOceanBaseOracleNavigationFallback(editor);
     patchQueryEditorAiInlineRightArrowFallback(editor, monaco);
     onMount?.(editor, monaco);
   }, [onMount]);
diff --git a/internal/app/db_context.go b/internal/app/db_context.go
index 9832357..e47f3fb 100644
--- a/internal/app/db_context.go
+++ b/internal/app/db_context.go
@@ -9,8 +9,6 @@ import (
 	"GoNavi-Wails/internal/db"
 )
 
-const defaultOceanBaseOracleQueryTimeoutSeconds = 120
-
 func normalizeRunConfig(config connection.ConnectionConfig, dbName string) connection.ConnectionConfig {
 	runConfig := config
 	name := strings.TrimSpace(dbName)
@@ -56,10 +54,6 @@ func applyOceanBaseOracleCurrentSchemaInit(config connection.ConnectionConfig, s
 	if normalizedSchema == "" {
 		return config
 	}
-	if config.Timeout <= 0 {
-		// OceanBase Oracle 查询经常需要经过 OBProxy/Oracle driver 的读等待；默认 30s 容易把慢查询误报成 driver: bad connection。
-		config.Timeout = defaultOceanBaseOracleQueryTimeoutSeconds
-	}
 	values, err := url.ParseQuery(strings.TrimSpace(config.ConnectionParams))
 	if err != nil {
 		return config
diff --git a/internal/app/db_context_oceanbase_oracle_test.go b/internal/app/db_context_oceanbase_oracle_test.go
index 3f3cebc..198af5a 100644
--- a/internal/app/db_context_oceanbase_oracle_test.go
+++ b/internal/app/db_context_oceanbase_oracle_test.go
@@ -20,8 +20,8 @@ func TestNormalizeRunConfig_OceanBaseOracleAddsCurrentSchemaInit(t *testing.T) {
 	if runConfig.Database != "OBORCL" {
 		t.Fatalf("expected OceanBase Oracle service name to stay OBORCL, got %q", runConfig.Database)
 	}
-	if runConfig.Timeout != defaultOceanBaseOracleQueryTimeoutSeconds {
-		t.Fatalf("expected OceanBase Oracle default query timeout %d, got %d", defaultOceanBaseOracleQueryTimeoutSeconds, runConfig.Timeout)
+	if runConfig.Timeout != 0 {
+		t.Fatalf("expected default OceanBase Oracle timeout to stay unset, got %d", runConfig.Timeout)
 	}
 	values, err := url.ParseQuery(runConfig.ConnectionParams)
 	if err != nil {
diff --git a/internal/db/sql_pool.go b/internal/db/sql_pool.go
index 146ec2a..13620c3 100644
--- a/internal/db/sql_pool.go
+++ b/internal/db/sql_pool.go
@@ -19,6 +19,12 @@ func configureSQLConnectionPool(db *sql.DB, dbType string) {
 	switch strings.ToLower(strings.TrimSpace(dbType)) {
 	case "sqlite", "duckdb":
 		return
+	case "oracle", "oceanbase":
+		db.SetMaxOpenConns(defaultSQLMaxOpenConns)
+		db.SetMaxIdleConns(1)
+		db.SetConnMaxIdleTime(defaultSQLConnMaxIdleTime)
+		db.SetConnMaxLifetime(defaultSQLConnMaxLifetime)
+		return
 	}
 	db.SetMaxOpenConns(defaultSQLMaxOpenConns)
 	db.SetMaxIdleConns(0)