diff --git a/frontend/src/utils/sqlErrorSemantics.test.ts b/frontend/src/utils/sqlErrorSemantics.test.ts
index 819229b4..02d1b3f3 100644
--- a/frontend/src/utils/sqlErrorSemantics.test.ts
+++ b/frontend/src/utils/sqlErrorSemantics.test.ts
@@ -37,6 +37,13 @@ describe('formatSqlExecutionError', () => {
     expect(formatted).toContain('Raw error: driver returned unexpected status 123');
   });
 
+  it('recognizes driver bad connection during SQL execution as timeout semantics', () => {
+    const formatted = formatSqlExecutionError('第 1 条语句执行失败：driver: bad connection');
+
+    expect(formatted).toContain('Semantic meaning: Query timed out or was canceled');
+    expect(formatted).toContain('Raw error: 第 1 条语句执行失败：driver: bad connection');
+  });
+
   it('recognizes localized connection-timeout wrappers as timeout semantics', () => {
     const translate = (key: string, params?: Record<string, unknown>) => {
       if (key === 'query_editor.sql_error.wrapper.semantic_line') {
diff --git a/frontend/src/utils/sqlErrorSemantics.ts b/frontend/src/utils/sqlErrorSemantics.ts
index 987ff53d..f6f5f8c2 100644
--- a/frontend/src/utils/sqlErrorSemantics.ts
+++ b/frontend/src/utils/sqlErrorSemantics.ts
@@ -135,6 +135,7 @@ const SQL_ERROR_RULES: SqlErrorSemanticRule[] = [
       /context cancelled/i,
       /timeout/i,
       /timed out/i,
+      /driver:\s*bad connection/i,
     ],
   },
   {
diff --git a/internal/app/db_context.go b/internal/app/db_context.go
index e47f3fb6..98323571 100644
--- a/internal/app/db_context.go
+++ b/internal/app/db_context.go
@@ -9,6 +9,8 @@ import (
 	"GoNavi-Wails/internal/db"
 )
 
+const defaultOceanBaseOracleQueryTimeoutSeconds = 120
+
 func normalizeRunConfig(config connection.ConnectionConfig, dbName string) connection.ConnectionConfig {
 	runConfig := config
 	name := strings.TrimSpace(dbName)
@@ -54,6 +56,10 @@ 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 bd831bac..3f3cebc8 100644
--- a/internal/app/db_context_oceanbase_oracle_test.go
+++ b/internal/app/db_context_oceanbase_oracle_test.go
@@ -20,6 +20,9 @@ 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)
+	}
 	values, err := url.ParseQuery(runConfig.ConnectionParams)
 	if err != nil {
 		t.Fatalf("unexpected connection params parse error: %v", err)
@@ -30,17 +33,21 @@ func TestNormalizeRunConfig_OceanBaseOracleAddsCurrentSchemaInit(t *testing.T) {
 	}
 }
 
-func TestNormalizeRunConfig_OceanBaseOraclePreservesExistingInit(t *testing.T) {
+func TestNormalizeRunConfig_OceanBaseOraclePreservesExplicitTimeoutAndExistingInit(t *testing.T) {
 	t.Parallel()
 
 	config := connection.ConnectionConfig{
 		Type:              "oceanbase",
 		Database:          "OBORCL",
 		OceanBaseProtocol: "oracle",
+		Timeout:           45,
 		ConnectionParams:  "init=ALTER+SESSION+SET+NLS_DATE_FORMAT%3D%27YYYY-MM-DD%27&timeout=10s",
 	}
 	runConfig := normalizeRunConfig(config, "sbdev")
 
+	if runConfig.Timeout != 45 {
+		t.Fatalf("expected explicit timeout to be preserved, got %d", runConfig.Timeout)
+	}
 	values, err := url.ParseQuery(runConfig.ConnectionParams)
 	if err != nil {
 		t.Fatalf("unexpected connection params parse error: %v", err)