diff --git a/apps/desktop/src/App.vue b/apps/desktop/src/App.vue
index d6576c2ba..34bafd8f0 100644
--- a/apps/desktop/src/App.vue
+++ b/apps/desktop/src/App.vue
@@ -217,6 +217,26 @@ function openAiPanel() {
   }
 }
 
+function isActiveObjectSourceReadOnly() {
+  return !!activeTab.value?.objectSource?.readOnlyReason;
+}
+
+function guardWritableObjectSource() {
+  if (!isActiveObjectSourceReadOnly()) return true;
+  toast(t("objects.sourceReadOnlySystemObject"), 5000);
+  return false;
+}
+
+function tryExecuteActiveTab() {
+  if (!guardWritableObjectSource()) return;
+  tryExecute();
+}
+
+function tryExplainActiveTab() {
+  if (!guardWritableObjectSource()) return;
+  tryExplain();
+}
+
 function analyzeHistoryWithAi(entry: HistoryEntry) {
   const connectionId = entry.connection_id || activeTab.value?.connectionId;
   if (!connectionId) {
@@ -253,6 +273,7 @@ async function openSaveSqlDialog() {
   const tab = activeTab.value;
   if (!tab || !tab.sql.trim()) return;
   if (tab.objectSource) {
+    if (!guardWritableObjectSource()) return;
     await saveActiveObjectSource(tab);
     return;
   }
@@ -282,6 +303,10 @@ async function saveActiveObjectSource(tab: NonNullable<typeof activeTab.value>)
   const connection = connectionStore.getConfig(tab.connectionId);
   const source = tab.objectSource;
   if (!connection || !source) return;
+  if (source.readOnlyReason) {
+    toast(t("objects.sourceReadOnlySystemObject"), 5000);
+    return;
+  }
 
   try {
     const statements = buildExecutableObjectSourceStatements({
@@ -563,7 +588,7 @@ function handleKeydown(e: KeyboardEvent) {
   ) {
     e.preventDefault();
     e.stopPropagation();
-    tryExecute();
+    tryExecuteActiveTab();
   }
 }
 
@@ -757,9 +782,9 @@ onUnmounted(() => {
                   :active-tab="activeTab"
                   :active-connection="activeConnection"
                   :executable-sql="executableSql"
-                  @execute="tryExecute()"
+                  @execute="tryExecuteActiveTab"
                   @cancel="cancelActiveExecution()"
-                  @explain="tryExplain()"
+                  @explain="tryExplainActiveTab"
                   @format-sql="formatActiveSql"
                   @save-sql="void openSaveSqlDialog()"
                   @open-sql="openSqlFile"
@@ -780,9 +805,9 @@ onUnmounted(() => {
                   :cursor-pos="cursorPos"
                   @update:active-output-view="activeOutputView = $event"
                   @fix-with-ai="fixWithAi"
-                  @execute="tryExecute()"
+                  @execute="tryExecuteActiveTab"
                   @cancel="cancelActiveExecution()"
-                  @explain="tryExplain()"
+                  @explain="tryExplainActiveTab"
                   @editor-update="
                     (v: string) => {
                       if (queryStore.activeTabId) queryStore.updateSql(queryStore.activeTabId, v);
diff --git a/apps/desktop/src/components/layout/ContentArea.vue b/apps/desktop/src/components/layout/ContentArea.vue
index 5c59a2af8..c83a101c5 100644
--- a/apps/desktop/src/components/layout/ContentArea.vue
+++ b/apps/desktop/src/components/layout/ContentArea.vue
@@ -28,6 +28,7 @@ const ExplainPlanViewer = defineAsyncComponent(() => import("@/components/explai
 const QueryChart = defineAsyncComponent(() => import("@/components/chart/QueryChart.vue"));
 import { useQueryStore } from "@/stores/queryStore";
 import { canCancelQueryExecution, queryExecutionLabelKey } from "@/lib/queryExecutionState";
+import { shouldShowQueryOutputPane } from "@/lib/contentAreaLayout";
 import { databaseDisplayNameForTab } from "@/lib/tabPresentation";
 import { isTableDataEditable } from "@/lib/tableEditing";
 import type { QueryTab, ConnectionConfig } from "@/types/database";
@@ -114,6 +115,9 @@ const activeQueryError = computed(() => {
   return String(result.rows[0]?.[0] ?? "");
 });
 
+const showQueryOutputPane = computed(() => shouldShowQueryOutputPane(props.activeTab));
+const objectSourceReadOnly = computed(() => !!props.activeTab.objectSource?.readOnlyReason);
+
 // Column info panel handlers
 async function onHandleClickColumn(
   matchedCols: Array<{ name: string; table: string; schema?: string }>,
@@ -202,7 +206,7 @@ defineExpose({ focusSearch });
     <!-- Query mode: editor + results -->
     <template v-if="activeTab.mode === 'query'">
       <Splitpanes horizontal class="flex-1">
-        <Pane :size="40" :min-size="15">
+        <Pane :size="showQueryOutputPane ? 40 : 100" :min-size="showQueryOutputPane ? 15 : 100">
           <div class="h-full flex flex-col relative">
             <QueryEditor
               class="flex-1"
@@ -213,6 +217,7 @@ defineExpose({ focusSearch });
               :format-dialect="activeSqlFormatDialect"
               :format-request-id="formatSqlRequestId"
               :execution-error="activeQueryError"
+              :read-only="objectSourceReadOnly"
               @update:model-value="emit('editorUpdate', $event)"
               @selection-change="emit('editorSelectionChange', $event)"
               @cursor-change="emit('editorCursorChange', $event)"
@@ -232,7 +237,7 @@ defineExpose({ focusSearch });
             />
           </div>
         </Pane>
-        <Pane :size="60" :min-size="20">
+        <Pane v-if="showQueryOutputPane" :size="60" :min-size="20">
           <div class="h-full flex flex-col">
             <div
               v-if="
diff --git a/apps/desktop/src/components/layout/EditorToolbar.vue b/apps/desktop/src/components/layout/EditorToolbar.vue
index 30d11d743..9f6ef7bd5 100644
--- a/apps/desktop/src/components/layout/EditorToolbar.vue
+++ b/apps/desktop/src/components/layout/EditorToolbar.vue
@@ -65,7 +65,11 @@ const activeConnectionValue = computed(() => props.activeConnection?.id || "");
 const activeSchemaValue = computed(() => props.activeTab.schema || "");
 const isSingleDb = computed(() => isSingleDatabase(props.activeConnection?.db_type));
 const schemaDatabaseKey = computed(() => props.activeTab.database || (isSingleDb.value ? "_" : ""));
-const saveTooltip = computed(() => (props.activeTab.objectSource ? t("objects.saveSource") : t("toolbar.saveSql")));
+const objectSourceReadOnly = computed(() => !!props.activeTab.objectSource?.readOnlyReason);
+const saveTooltip = computed(() => {
+  if (objectSourceReadOnly.value) return t("objects.sourceReadOnlySystemObject");
+  return props.activeTab.objectSource ? t("objects.saveSource") : t("toolbar.saveSql");
+});
 
 const showSchemaSelector = computed(() => {
   const connection = props.activeConnection;
@@ -124,7 +128,10 @@ function connectionById(connectionId: string): ConnectionConfig | undefined {
                 : 'bg-emerald-500/10 text-emerald-700 hover:bg-emerald-500/20 hover:text-emerald-800 dark:text-emerald-300 dark:hover:text-emerald-200'
             "
             :disabled="
-              activeTab.isCancelling || activeTab.isExplaining || (!activeTab.isExecuting && !executableSql.trim())
+              objectSourceReadOnly ||
+              activeTab.isCancelling ||
+              activeTab.isExplaining ||
+              (!activeTab.isExecuting && !executableSql.trim())
             "
             @click="activeTab.isExecuting ? emit('cancel') : emit('execute')"
           >
@@ -148,7 +155,9 @@ function connectionById(connectionId: string): ConnectionConfig | undefined {
                 ? ''
                 : 'text-violet-600 hover:bg-violet-500/10 hover:text-violet-700 dark:text-violet-300 dark:hover:text-violet-200'
             "
-            :disabled="activeTab.isExecuting || (!activeTab.isExplaining && !executableSql.trim())"
+            :disabled="
+              objectSourceReadOnly || activeTab.isExecuting || (!activeTab.isExplaining && !executableSql.trim())
+            "
             @click="activeTab.isExplaining ? emit('cancel') : emit('explain')"
           >
             <Square v-if="activeTab.isExplaining" class="h-3.5 w-3.5 fill-current" />
@@ -165,7 +174,7 @@ function connectionById(connectionId: string): ConnectionConfig | undefined {
             variant="ghost"
             size="icon"
             class="h-6 w-6 text-amber-600 hover:bg-amber-500/10 hover:text-amber-700 dark:text-amber-300 dark:hover:text-amber-200"
-            :disabled="activeTab.isExecuting || activeTab.isExplaining || !activeTab.sql.trim()"
+            :disabled="objectSourceReadOnly || activeTab.isExecuting || activeTab.isExplaining || !activeTab.sql.trim()"
             @click="emit('formatSql')"
           >
             <AlignLeft class="h-3.5 w-3.5" />
@@ -179,7 +188,7 @@ function connectionById(connectionId: string): ConnectionConfig | undefined {
             variant="ghost"
             size="icon"
             class="h-6 w-6 text-blue-600 hover:bg-blue-500/10 hover:text-blue-700 dark:text-blue-300 dark:hover:text-blue-200"
-            :disabled="!activeTab.sql.trim()"
+            :disabled="objectSourceReadOnly || !activeTab.sql.trim()"
             @click="emit('saveSql')"
           >
             <Save class="h-3.5 w-3.5" />
diff --git a/apps/desktop/src/components/objects/ObjectBrowser.vue b/apps/desktop/src/components/objects/ObjectBrowser.vue
index 8e7115aa0..da1156d7f 100644
--- a/apps/desktop/src/components/objects/ObjectBrowser.vue
+++ b/apps/desktop/src/components/objects/ObjectBrowser.vue
@@ -34,7 +34,11 @@ import type { ConnectionConfig, ObjectInfo, ObjectSourceKind } from "@/types/dat
 import { isSchemaAware } from "@/lib/databaseCapabilities";
 import { buildTableSelectSql, qualifiedTableName } from "@/lib/tableSelectSql";
 import { useToast } from "@/composables/useToast";
-import { buildExecutableObjectSourceStatements, objectSourceSaveExecutionMode } from "@/lib/objectSourceEditor";
+import {
+  buildExecutableObjectSourceStatements,
+  objectSourceReadOnlyReason,
+  objectSourceSaveExecutionMode,
+} from "@/lib/objectSourceEditor";
 import { buildRenameObjectSql, supportsObjectRename } from "@/lib/objectRenameSql";
 import { useConnectionStore } from "@/stores/connectionStore";
 import { useQueryStore } from "@/stores/queryStore";
@@ -108,6 +112,7 @@ const sourceFormatDialect = computed<SqlFormatDialect>(() => {
       return "generic";
   }
 });
+const sourceRowReadOnlyReason = computed(() => (sourceRow.value ? readOnlyReasonForRow(sourceRow.value) : null));
 const objectFilters = computed<ObjectFilter[]>(() =>
   (
     [
@@ -169,7 +174,17 @@ function canOpenSource(row: ObjectBrowserRow) {
 }
 
 function canRename(row: ObjectBrowserRow) {
-  return supportsObjectRename(props.connection.db_type, row.type);
+  return !readOnlyReasonForRow(row) && supportsObjectRename(props.connection.db_type, row.type);
+}
+
+function readOnlyReasonForRow(row: ObjectBrowserRow) {
+  if (row.type !== "VIEW" && row.type !== "PROCEDURE" && row.type !== "FUNCTION") return null;
+  return objectSourceReadOnlyReason({
+    databaseType: props.connection.db_type,
+    schema: row.schema || selectedSchema.value || props.database,
+    name: row.name,
+    objectType: row.type,
+  });
 }
 
 function sourceTitle(row: ObjectBrowserRow | null) {
@@ -205,7 +220,7 @@ async function openSource(row: ObjectBrowserRow) {
     );
     sourceContent.value = result.source;
     sourceDraft.value = result.source;
-    sourceEditing.value = true;
+    sourceEditing.value = !readOnlyReasonForRow(row);
   } catch (e: any) {
     sourceError.value = e?.message || String(e);
   } finally {
@@ -235,11 +250,19 @@ function qualifiedName(row: ObjectBrowserRow): string {
 }
 
 function requestDrop(row: ObjectBrowserRow) {
+  if (readOnlyReasonForRow(row)) {
+    toast(t("objects.sourceReadOnlySystemObject"), 5000);
+    return;
+  }
   dropTarget.value = row;
   showDropConfirm.value = true;
 }
 
 function requestRename(row: ObjectBrowserRow) {
+  if (readOnlyReasonForRow(row)) {
+    toast(t("objects.sourceReadOnlySystemObject"), 5000);
+    return;
+  }
   renameTarget.value = row;
   renameInput.value = row.name;
   renameError.value = "";
@@ -267,6 +290,10 @@ async function confirmRename() {
   const row = renameTarget.value;
   const newName = renameInput.value.trim();
   if (!row || !newName || newName === row.name) return;
+  if (readOnlyReasonForRow(row)) {
+    renameError.value = t("objects.sourceReadOnlySystemObject");
+    return;
+  }
   renameError.value = "";
   try {
     const schema = row.schema || selectedSchema.value || props.database;
@@ -295,6 +322,11 @@ async function confirmRename() {
 async function confirmDrop() {
   if (!dropTarget.value) return;
   const row = dropTarget.value;
+  if (readOnlyReasonForRow(row)) {
+    toast(t("objects.sourceReadOnlySystemObject"), 5000);
+    dropTarget.value = null;
+    return;
+  }
   const typeSql =
     row.type === "VIEW"
       ? "VIEW"
@@ -363,6 +395,10 @@ function copySource() {
 
 function editSource() {
   if (!sourceRow.value || !sourceContent.value) return;
+  if (sourceRowReadOnlyReason.value) {
+    toast(t("objects.sourceReadOnlySystemObject"), 5000);
+    return;
+  }
   sourceDraft.value = sourceContent.value;
   sourceSaveError.value = "";
   sourceEditing.value = true;
@@ -376,6 +412,10 @@ function cancelEditSource() {
 
 async function saveSource() {
   if (!sourceRow.value || !sourceDraft.value.trim()) return;
+  if (sourceRowReadOnlyReason.value) {
+    toast(t("objects.sourceReadOnlySystemObject"), 5000);
+    return;
+  }
   const row = sourceRow.value;
   const schema = row.schema || selectedSchema.value || props.database;
   sourceSaving.value = true;
@@ -651,11 +691,13 @@ watch(
                 <ContextMenuItem v-if="canRename(item)" @click="requestRename(item)">
                   <Pencil class="w-4 h-4 mr-2" /> {{ t("contextMenu.renameObject") }}
                 </ContextMenuItem>
-                <ContextMenuSeparator />
-                <ContextMenuItem class="text-destructive" @click="requestDrop(item)">
-                  <Trash2 class="w-4 h-4 mr-2" />
-                  {{ item.type === "PROCEDURE" ? t("contextMenu.dropProcedure") : t("contextMenu.dropFunction") }}
-                </ContextMenuItem>
+                <template v-if="!readOnlyReasonForRow(item)">
+                  <ContextMenuSeparator />
+                  <ContextMenuItem class="text-destructive" @click="requestDrop(item)">
+                    <Trash2 class="w-4 h-4 mr-2" />
+                    {{ item.type === "PROCEDURE" ? t("contextMenu.dropProcedure") : t("contextMenu.dropFunction") }}
+                  </ContextMenuItem>
+                </template>
               </template>
             </ContextMenuContent>
           </ContextMenu>
@@ -701,7 +743,8 @@ watch(
             variant="ghost"
             size="icon"
             class="h-5 w-5"
-            :disabled="!sourceContent"
+            :disabled="!sourceContent || !!sourceRowReadOnlyReason"
+            :title="sourceRowReadOnlyReason ? t('objects.sourceReadOnlySystemObject') : undefined"
             @click="editSource"
           >
             <PencilLine class="h-3 w-3" />
@@ -724,6 +767,7 @@ watch(
             :database="props.database"
             :dialect="sourceDialect"
             :format-dialect="sourceFormatDialect"
+            :read-only="!!sourceRowReadOnlyReason"
             force-word-wrap
             @save="saveSource"
           />
diff --git a/apps/desktop/src/components/sidebar/TreeItem.vue b/apps/desktop/src/components/sidebar/TreeItem.vue
index 326f8784c..b96417b01 100644
--- a/apps/desktop/src/components/sidebar/TreeItem.vue
+++ b/apps/desktop/src/components/sidebar/TreeItem.vue
@@ -92,6 +92,7 @@ import {
   treeNodeRowAction,
   treeNodeRowDoubleClickAction,
 } from "@/lib/treeNodeClick";
+import { objectSourceReadOnlyReason } from "@/lib/objectSourceEditor";
 import { formatCsv, formatJson, formatSqlInsert } from "@/lib/exportFormats";
 import { fetchTableDataForExport } from "@/lib/tableDataExport";
 import {
@@ -659,6 +660,18 @@ function viewObjectSource() {
         schema,
         name: node.label,
         objectType,
+        readOnlyReason: (() => {
+          const databaseType = currentDatabaseType();
+          if (!databaseType) return undefined;
+          return (
+            objectSourceReadOnlyReason({
+              databaseType,
+              schema,
+              name: node.label,
+              objectType,
+            }) ?? undefined
+          );
+        })(),
       });
     })
     .catch((e: any) => {
@@ -667,6 +680,10 @@ function viewObjectSource() {
 }
 
 function requestDropObject() {
+  if (currentObjectSourceReadOnlyReason.value) {
+    toast(t("objects.sourceReadOnlySystemObject"), 5000);
+    return;
+  }
   showDropObjectConfirm.value = true;
 }
 
@@ -680,7 +697,21 @@ function nodeRenameObjectType(): RenameableObjectType | null {
 
 const canRenameObject = computed(() => {
   const objectType = nodeRenameObjectType();
-  return !!objectType && supportsObjectRename(currentDatabaseType(), objectType);
+  return (
+    !!objectType && !currentObjectSourceReadOnlyReason.value && supportsObjectRename(currentDatabaseType(), objectType)
+  );
+});
+
+const currentObjectSourceReadOnlyReason = computed(() => {
+  const objectType = objectSourceKindForTreeNode(props.node.type);
+  const databaseType = currentDatabaseType();
+  if (!objectType || !databaseType) return null;
+  return objectSourceReadOnlyReason({
+    databaseType,
+    schema: props.node.schema,
+    name: props.node.label,
+    objectType,
+  });
 });
 
 function openRenameObjectDialog() {
@@ -1968,11 +1999,13 @@ const isDragging = computed(() => dragState.active && dragState.draggedId === pr
           <Pencil class="w-4 h-4 mr-2" />
           {{ t("contextMenu.renameObject") }}
         </ContextMenuItem>
-        <ContextMenuSeparator />
-        <ContextMenuItem class="text-destructive" @click="requestDropObject">
-          <Trash2 class="w-4 h-4 mr-2" />
-          {{ node.type === "procedure" ? t("contextMenu.dropProcedure") : t("contextMenu.dropFunction") }}
-        </ContextMenuItem>
+        <template v-if="!currentObjectSourceReadOnlyReason">
+          <ContextMenuSeparator />
+          <ContextMenuItem class="text-destructive" @click="requestDropObject">
+            <Trash2 class="w-4 h-4 mr-2" />
+            {{ node.type === "procedure" ? t("contextMenu.dropProcedure") : t("contextMenu.dropFunction") }}
+          </ContextMenuItem>
+        </template>
       </template>
 
       <template v-if="isGroupLabel(node)">
diff --git a/apps/desktop/src/i18n/locales/en.ts b/apps/desktop/src/i18n/locales/en.ts
index 253d91f04..5c0d429b9 100644
--- a/apps/desktop/src/i18n/locales/en.ts
+++ b/apps/desktop/src/i18n/locales/en.ts
@@ -758,6 +758,7 @@ export default {
     cancelEdit: "Cancel",
     sourceSaved: "Source saved",
     sourceSaveFailed: "Failed to save source: {message}",
+    sourceReadOnlySystemObject: "System objects are protected and cannot be modified or deleted",
     schemaColumn: "Schema",
     comment: "Comment",
     loadingSchemas: "Loading schemas...",
diff --git a/apps/desktop/src/i18n/locales/es.ts b/apps/desktop/src/i18n/locales/es.ts
index 6bf2042e5..1db73429c 100644
--- a/apps/desktop/src/i18n/locales/es.ts
+++ b/apps/desktop/src/i18n/locales/es.ts
@@ -663,6 +663,7 @@ export default {
     cancelEdit: "Cancelar",
     sourceSaved: "Código fuente guardado",
     sourceSaveFailed: "Error al guardar el código fuente: {message}",
+    sourceReadOnlySystemObject: "Los objetos del sistema están protegidos y no se pueden modificar ni eliminar",
     schemaColumn: "Esquema",
     comment: "Comentario",
     loadingSchemas: "Cargando esquemas...",
diff --git a/apps/desktop/src/i18n/locales/zh-CN.ts b/apps/desktop/src/i18n/locales/zh-CN.ts
index d408649a3..903060346 100644
--- a/apps/desktop/src/i18n/locales/zh-CN.ts
+++ b/apps/desktop/src/i18n/locales/zh-CN.ts
@@ -739,6 +739,7 @@ export default {
     cancelEdit: "取消",
     sourceSaved: "源码已保存",
     sourceSaveFailed: "保存源码失败：{message}",
+    sourceReadOnlySystemObject: "系统对象受保护，不能修改或删除",
     schemaColumn: "Schema",
     comment: "注释",
     loadingSchemas: "加载 Schema...",
diff --git a/apps/desktop/src/lib/contentAreaLayout.ts b/apps/desktop/src/lib/contentAreaLayout.ts
new file mode 100644
index 000000000..bc4e4d4b8
--- /dev/null
+++ b/apps/desktop/src/lib/contentAreaLayout.ts
@@ -0,0 +1,13 @@
+import type { QueryTab } from "@/types/database";
+
+type QueryOutputPaneState = Pick<
+  QueryTab,
+  "mode" | "objectSource" | "result" | "explainPlan" | "explainError" | "isExecuting" | "isExplaining"
+>;
+
+export function shouldShowQueryOutputPane(tab: QueryOutputPaneState): boolean {
+  if (tab.mode !== "query") return false;
+  if (!tab.objectSource) return true;
+
+  return !!(tab.result || tab.explainPlan || tab.explainError || tab.isExecuting || tab.isExplaining);
+}
diff --git a/apps/desktop/src/lib/objectSourceEditor.ts b/apps/desktop/src/lib/objectSourceEditor.ts
index f95c1040d..634dc659e 100644
--- a/apps/desktop/src/lib/objectSourceEditor.ts
+++ b/apps/desktop/src/lib/objectSourceEditor.ts
@@ -9,6 +9,14 @@ type BuildEditableObjectSourceSqlInput = {
 };
 
 export type ObjectSourceSaveExecutionMode = "single" | "script";
+export type ObjectSourceReadOnlyReason = "system-object";
+
+type ObjectSourceReadOnlyInput = {
+  databaseType: DatabaseType;
+  schema?: string | null;
+  name: string;
+  objectType: ObjectSourceKind;
+};
 
 const postgresLikeRoutineRenameTypes = new Set<DatabaseType>([
   "postgres",
@@ -98,3 +106,37 @@ export function buildExecutableObjectSourceSql(input: BuildEditableObjectSourceS
 export function objectSourceSaveExecutionMode(_databaseType: DatabaseType): ObjectSourceSaveExecutionMode {
   return "single";
 }
+
+const readOnlySystemSchemas = new Set([
+  "information_schema",
+  "pg_catalog",
+  "sys",
+  "system",
+  "mysql",
+  "performance_schema",
+  "xdb",
+  "outln",
+  "dbsnmp",
+  "ctisys",
+  "sysauditor",
+  "syssso",
+]);
+
+const damengSysdbaRoutinePrefixes = ["SP_TS_", "SP_ARCH_", "SP_DB_", "SP_DROP_CONS_", "SP_TAB_", "SP_UPDATE_SYS"];
+
+export function objectSourceReadOnlyReason(input: ObjectSourceReadOnlyInput): ObjectSourceReadOnlyReason | null {
+  const schema = input.schema?.trim().toLowerCase();
+  if (schema && readOnlySystemSchemas.has(schema)) return "system-object";
+
+  const name = input.name.trim().toUpperCase();
+  if (
+    input.databaseType === "dameng" &&
+    input.schema?.trim().toUpperCase() === "SYSDBA" &&
+    (input.objectType === "PROCEDURE" || input.objectType === "FUNCTION") &&
+    damengSysdbaRoutinePrefixes.some((prefix) => name.startsWith(prefix))
+  ) {
+    return "system-object";
+  }
+
+  return null;
+}
diff --git a/apps/desktop/src/types/database.ts b/apps/desktop/src/types/database.ts
index 249370896..812d8f76c 100644
--- a/apps/desktop/src/types/database.ts
+++ b/apps/desktop/src/types/database.ts
@@ -289,6 +289,7 @@ export interface QueryTab {
     schema?: string;
     name: string;
     objectType: ObjectSourceKind;
+    readOnlyReason?: "system-object";
   };
   tableMeta?: {
     schema?: string;
diff --git a/packages/app-tests/contentAreaLayout.test.ts b/packages/app-tests/contentAreaLayout.test.ts
new file mode 100644
index 000000000..6d05a704a
--- /dev/null
+++ b/packages/app-tests/contentAreaLayout.test.ts
@@ -0,0 +1,54 @@
+import { strict as assert } from "node:assert";
+import test from "node:test";
+import { shouldShowQueryOutputPane } from "../../apps/desktop/src/lib/contentAreaLayout.ts";
+
+test("object source tabs hide the query output pane while idle", () => {
+  assert.equal(
+    shouldShowQueryOutputPane({
+      mode: "query",
+      objectSource: { objectType: "PROCEDURE", name: "refresh_cache" },
+      isExecuting: false,
+      isExplaining: false,
+    }),
+    false,
+  );
+});
+
+test("object source tabs show the query output pane after execution starts or returns feedback", () => {
+  assert.equal(
+    shouldShowQueryOutputPane({
+      mode: "query",
+      objectSource: { objectType: "FUNCTION", name: "calc_total" },
+      isExecuting: true,
+      isExplaining: false,
+    }),
+    true,
+  );
+
+  assert.equal(
+    shouldShowQueryOutputPane({
+      mode: "query",
+      objectSource: { objectType: "PROCEDURE", name: "refresh_cache" },
+      isExecuting: false,
+      isExplaining: false,
+      result: {
+        columns: ["Error"],
+        rows: [["syntax error"]],
+        affected_rows: 0,
+        execution_time_ms: 2,
+      },
+    }),
+    true,
+  );
+});
+
+test("regular query tabs keep the output pane visible before execution", () => {
+  assert.equal(
+    shouldShowQueryOutputPane({
+      mode: "query",
+      isExecuting: false,
+      isExplaining: false,
+    }),
+    true,
+  );
+});
diff --git a/packages/app-tests/objectSourceEditor.test.ts b/packages/app-tests/objectSourceEditor.test.ts
index f9bbc98ef..d86911f31 100644
--- a/packages/app-tests/objectSourceEditor.test.ts
+++ b/packages/app-tests/objectSourceEditor.test.ts
@@ -3,6 +3,7 @@ import test from "node:test";
 import {
   buildExecutableObjectSourceSql,
   buildExecutableObjectSourceStatements,
+  objectSourceReadOnlyReason,
   objectSourceSaveExecutionMode,
 } from "../../apps/desktop/src/lib/objectSourceEditor.ts";
 
@@ -104,3 +105,37 @@ test("object source SQL joins generated save statements for previews", () => {
     'CREATE OR REPLACE PROCEDURE "public"."refresh_cache_v2"(mode text)\nLANGUAGE SQL\nAS $$ SELECT 1 $$;\nDROP PROCEDURE IF EXISTS "public"."refresh_cache"(mode text);',
   );
 });
+
+test("system schemas open object source as read-only", () => {
+  assert.equal(
+    objectSourceReadOnlyReason({
+      databaseType: "oracle",
+      schema: "SYS",
+      name: "DBMS_STATS",
+      objectType: "PROCEDURE",
+    }),
+    "system-object",
+  );
+});
+
+test("Dameng built-in maintenance routines open as read-only without blocking user SP names", () => {
+  assert.equal(
+    objectSourceReadOnlyReason({
+      databaseType: "dameng",
+      schema: "SYSDBA",
+      name: "SP_TS_BAKSET_REMOVE_BATCH",
+      objectType: "PROCEDURE",
+    }),
+    "system-object",
+  );
+
+  assert.equal(
+    objectSourceReadOnlyReason({
+      databaseType: "dameng",
+      schema: "SYSDBA",
+      name: "SP_HELLO",
+      objectType: "PROCEDURE",
+    }),
+    null,
+  );
+});