diff --git a/tests/integration_tests/cdc/cdc.go b/tests/integration_tests/cdc/cdc.go
index 1336d7f119f..7031101aa48 100644
--- a/tests/integration_tests/cdc/cdc.go
+++ b/tests/integration_tests/cdc/cdc.go
@@ -56,16 +56,5 @@ func main() {
 		}
 	}()
 
-	// TODO(dongmen): remove the useless code
-	sourceDBs, err := util.CreateSourceDBs()
-	if err != nil {
-		log.S().Fatal(err)
-	}
-	defer func() {
-		if err := util.CloseDBs(sourceDBs); err != nil {
-			log.S().Errorf("Failed to close source databases: %s\n", err)
-		}
-	}()
-
 	dailytest.Run(sourceDB, targetDB, cfg.SourceDBCfg[0].Name, cfg.WorkerCount, cfg.JobCount, cfg.Batch)
 }
diff --git a/tests/integration_tests/cdc/dailytest/case.go b/tests/integration_tests/cdc/dailytest/case.go
index 3dd44770ad7..350c6026045 100644
--- a/tests/integration_tests/cdc/dailytest/case.go
+++ b/tests/integration_tests/cdc/dailytest/case.go
@@ -191,6 +191,8 @@ func ineligibleTable(tr *testRunner, src *sql.DB, dst *sql.DB) {
 		"insert into eligible_table (uk, ncol) values (2,2);",
 		"ALTER TABLE eligible_table ADD COLUMN c1 INT NOT NULL;",
 		"insert into eligible_table (uk, ncol, c1) values (3,4,5);",
+
+		"CREATE TABLE finish_mark(id int primary key);",
 	}
 	// execute SQL but don't check
 	for _, sql := range sqls {
@@ -216,7 +218,7 @@ TestLoop:
 			if synced {
 				break TestLoop
 			}
-			if tableName == "eligible_table" {
+			if tableName == "finish_mark" {
 				synced = true
 			}
 		}
@@ -227,6 +229,7 @@ TestLoop:
 		"DROP TABLE ineligible_table1;",
 		"DROP TABLE ineligible_table2;",
 		"DROP TABLE eligible_table;",
+		"DROP TABLE finish_mark;",
 	}
 	tr.execSQLs(sqls)
 }
diff --git a/tests/integration_tests/default_value/main.go b/tests/integration_tests/default_value/main.go
index b6b6dd6f4a2..bba57419cbe 100644
--- a/tests/integration_tests/default_value/main.go
+++ b/tests/integration_tests/default_value/main.go
@@ -74,15 +74,21 @@ func main() {
 		log.S().Infof("DefaultValue integration tests take %v", time.Since(start))
 	}()
 	wg.Add(2)
-	go testMultiDDLs([]*sql.DB{sourceDB0, sourceDB1}, &wg)
-	go testGetDefaultValue([]*sql.DB{sourceDB0, sourceDB1}, &wg)
+
+	go func() {
+		defer wg.Done()
+		testMultiDDLs([]*sql.DB{sourceDB0, sourceDB1})
+	}()
+	go func() {
+		defer wg.Done()
+		testGetDefaultValue([]*sql.DB{sourceDB0, sourceDB1})
+	}()
 	wg.Wait()
 	util.MustExec(sourceDB0, "create table mark.finish_mark(a int primary key);")
 }
 
 // for every DDL, run the DDL continuously, and one goroutine for one TiDB instance to do some DML op
-func testGetDefaultValue(srcs []*sql.DB, wg *sync.WaitGroup) {
-	defer wg.Done()
+func testGetDefaultValue(srcs []*sql.DB) {
 	start := time.Now()
 	defer func() {
 		log.S().Infof("testGetDefaultValue take %v", time.Since(start))
@@ -342,9 +348,7 @@ func ddlDefaultValueFunc(ctx context.Context, db *sql.DB, format string, table s
 	}
 }
 
-func testMultiDDLs(srcs []*sql.DB, wg *sync.WaitGroup) {
-	defer wg.Done()
-
+func testMultiDDLs(srcs []*sql.DB) {
 	type Unit struct {
 		Fmt          string
 		DefaultValue interface{}
@@ -886,9 +890,3 @@ func mustCreateTable(db *sql.DB, tableName string) {
 	sql := fmt.Sprintf(createTableSQL, tableName)
 	util.MustExec(db, sql)
 }
-
-func mustCreateTableWithConn(ctx context.Context, conn *sql.Conn, tableName string) {
-	util.MustExecWithConn(ctx, conn, createDatabaseSQL)
-	sql := fmt.Sprintf(createTableSQL, tableName)
-	util.MustExecWithConn(ctx, conn, sql)
-}
diff --git a/tests/integration_tests/util/db.go b/tests/integration_tests/util/db.go
index f8db3de7415..2a65459c745 100644
--- a/tests/integration_tests/util/db.go
+++ b/tests/integration_tests/util/db.go
@@ -156,55 +156,3 @@ func MustExecWithConn(ctx context.Context, conn *sql.Conn, sql string, args ...i
 		log.S().Fatal(err)
 	}
 }
-
-// CreateSourceDBs return source sql.DB for test
-// we create two TiDB instance now in tests/integration_tests/run.sh, change it if needed
-func CreateSourceDBs() (dbs []*sql.DB, err error) {
-	cfg := DBConfig{
-		Host:     "127.0.0.1",
-		User:     "root",
-		Password: "",
-		Name:     "test",
-		Port:     4000,
-	}
-
-	src1, err := CreateDB(cfg)
-	if err != nil {
-		return nil, errors.Trace(err)
-	}
-
-	cfg.Port = 4001
-	src2, err := CreateDB(cfg)
-	if err != nil {
-		return nil, errors.Trace(err)
-	}
-
-	dbs = append(dbs, src1, src2)
-	return
-}
-
-// CreateSourceDB return source sql.DB for test
-func CreateSourceDB() (db *sql.DB, err error) {
-	cfg := DBConfig{
-		Host:     "127.0.0.1",
-		User:     "root",
-		Password: "",
-		Name:     "test",
-		Port:     4000,
-	}
-
-	return CreateDB(cfg)
-}
-
-// CreateSinkDB return sink sql.DB for test
-func CreateSinkDB() (db *sql.DB, err error) {
-	cfg := DBConfig{
-		Host:     "127.0.0.1",
-		User:     "root",
-		Password: "",
-		Name:     "test",
-		Port:     3306,
-	}
-
-	return CreateDB(cfg)
-}