diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 6ce5140c..1e1ac12d 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -20,4 +20,8 @@ jobs:
           sleep 10
           popd
           go test -v -race
-        
\ No newline at end of file
+      - name: Run examples
+        run: |
+          go run basic_example/graph_client_basic_example.go
+          go run gorountines_example/graph_client_goroutines_example.go
+        
diff --git a/Makefile b/Makefile
index 887e306f..85a2f5ed 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-.PHONY: build test test-dev fmt ci
+.PHONY: build test fmt ci run-examples
 
 default: build
 
@@ -19,3 +19,7 @@ ci:
 	cd .. && \
 	go test -v -race; \
 	cd ./nebula-docker-compose && docker-compose down -v 
+
+run-examples:
+	go run basic_example/graph_client_basic_example.go
+	go run gorountines_example/graph_client_goroutines_example.go
diff --git a/basic_example/graph_client_basic_example.go b/basic_example/graph_client_basic_example.go
index 920aef7e..ea93155a 100644
--- a/basic_example/graph_client_basic_example.go
+++ b/basic_example/graph_client_basic_example.go
@@ -13,10 +13,12 @@ import (
 )
 
 const (
-	address  = "127.0.0.1"
-	port     = 9669
-	username = "user"
-	password = "password"
+	address = "127.0.0.1"
+	// The default port of Nebula Graph 2.x is 9669.
+	// 3699 is only for testing.
+	port     = 3699
+	username = "root"
+	password = "nebula"
 )
 
 // Initialize logger
@@ -47,14 +49,14 @@ func main() {
 
 	checkResultSet := func(prefix string, res *nebula.ResultSet) {
 		if !res.IsSucceed() {
-			fmt.Printf("%s, ErrorCode: %v, ErrorMsg: %s", prefix, res.GetErrorCode(), res.GetErrorMsg())
+			log.Fatal(fmt.Sprintf("%s, ErrorCode: %v, ErrorMsg: %s", prefix, res.GetErrorCode(), res.GetErrorMsg()))
 		}
 	}
 
 	{
 		// Prepare the query
-		createSchema := "CREATE SPACE IF NOT EXISTS test; " +
-			"USE test;" +
+		createSchema := "CREATE SPACE IF NOT EXISTS basic_example_space(vid_type=FIXED_STRING(20)); " +
+			"USE basic_example_space;" +
 			"CREATE TAG IF NOT EXISTS person(name string, age int);" +
 			"CREATE EDGE IF NOT EXISTS like(likeness double)"
 
@@ -66,6 +68,17 @@ func main() {
 		}
 		checkResultSet(createSchema, resultSet)
 	}
+	// Drop space
+	{
+		query := "DROP SPACE IF EXISTS basic_example_space"
+		// Send query
+		resultSet, err := session.Execute(query)
+		if err != nil {
+			fmt.Print(err.Error())
+			return
+		}
+		checkResultSet(query, resultSet)
+	}
 
 	fmt.Print("\n")
 	log.Info("Nebula Go Client Basic Example Finished")
diff --git a/client_test.go b/client_test.go
index 2867f0bd..f9d6931f 100644
--- a/client_test.go
+++ b/client_test.go
@@ -276,7 +276,7 @@ func TestServiceDataIO(t *testing.T) {
 		}
 		checkResultSet(createSchema, resultSet)
 	}
-	time.Sleep(5 * time.Second)
+	time.Sleep(3 * time.Second)
 
 	// Load data
 	{
@@ -950,14 +950,13 @@ func startContainer(t *testing.T, containerName string) {
 	}
 }
 
-func tryToExecute(session *Session, query string) (*ResultSet, error) {
-	var err error
+func tryToExecute(session *Session, query string) (resp *ResultSet, err error) {
 	for i := 3; i > 0; i-- {
-		resp, err := session.Execute(query)
+		resp, err = session.Execute(query)
 		if err == nil && resp.IsSucceed() {
-			return resp, nil
+			return
 		}
 		time.Sleep(2 * time.Second)
 	}
-	return nil, err
+	return
 }
diff --git a/gorountines_example/graph_client_goroutines_example.go b/gorountines_example/graph_client_goroutines_example.go
index 72061f9e..27c9406d 100644
--- a/gorountines_example/graph_client_goroutines_example.go
+++ b/gorountines_example/graph_client_goroutines_example.go
@@ -16,10 +16,12 @@ import (
 )
 
 const (
-	address  = "127.0.0.1"
-	port     = 9669
-	username = "user"
-	password = "password"
+	address = "127.0.0.1"
+	// The default port of Nebula Graph 2.x is 9669.
+	// 3699 is only for testing.
+	port     = 3699
+	username = "root"
+	password = "nebula"
 )
 
 // Initialize logger
@@ -54,11 +56,11 @@ func main() {
 		// Method used to check execution response
 		checkResultSet := func(prefix string, res *nebula.ResultSet) {
 			if !res.IsSucceed() {
-				fmt.Printf("%s, ErrorCode: %v, ErrorMsg: %s", prefix, res.GetErrorCode(), res.GetErrorMsg())
+				log.Fatal(fmt.Sprintf("%s, ErrorCode: %v, ErrorMsg: %s", prefix, res.GetErrorCode(), res.GetErrorMsg()))
 			}
 		}
 		{
-			createSchema := "CREATE SPACE IF NOT EXISTS example_space; " +
+			createSchema := "CREATE SPACE IF NOT EXISTS example_space(vid_type=FIXED_STRING(20)); " +
 				"USE example_space;" +
 				"CREATE TAG IF NOT EXISTS person(name string, age int);" +
 				"CREATE EDGE IF NOT EXISTS like(likeness double)"
@@ -145,6 +147,17 @@ func main() {
 			// Print ValueWrapper using String()
 			fmt.Printf("Print using ValueWrapper.String(): %s", valueWrapper.String())
 		}
+		// Drop space
+		{
+			query := "DROP SPACE IF EXISTS example_space"
+			// Send query
+			resultSet, err := session.Execute(query)
+			if err != nil {
+				fmt.Print(err.Error())
+				return
+			}
+			checkResultSet(query, resultSet)
+		}
 	}(&wg)
 	wg.Wait()
 
diff --git a/nebula-docker-compose/docker-compose.yaml b/nebula-docker-compose/docker-compose.yaml
index 62e658ee..6e16f2d9 100644
--- a/nebula-docker-compose/docker-compose.yaml
+++ b/nebula-docker-compose/docker-compose.yaml
@@ -16,6 +16,7 @@ services:
       - --v=0
       - --minloglevel=0
       - --timezone_name=+08:00
+      - --heartbeat_interval_secs=1
     healthcheck:
       test: ["CMD", "curl", "-sf", "http://metad0:11000/status"]
       interval: 30s
@@ -51,6 +52,7 @@ services:
       - --v=0
       - --minloglevel=0
       - --timezone_name=+08:00
+      - --heartbeat_interval_secs=1
     healthcheck:
       test: ["CMD", "curl", "-sf", "http://metad1:11000/status"]
       interval: 30s
@@ -86,6 +88,7 @@ services:
       - --v=0
       - --minloglevel=0
       - --timezone_name=+08:00
+      - --heartbeat_interval_secs=1
     healthcheck:
       test: ["CMD", "curl", "-sf", "http://metad2:11000/status"]
       interval: 30s
@@ -121,6 +124,7 @@ services:
       - --v=0
       - --minloglevel=0
       - --timezone_name=+08:00
+      - --heartbeat_interval_secs=1
     depends_on:
       - metad0
       - metad1
@@ -160,6 +164,7 @@ services:
       - --v=0
       - --minloglevel=0
       - --timezone_name=+08:00
+      - --heartbeat_interval_secs=1
     depends_on:
       - metad0
       - metad1
@@ -199,6 +204,7 @@ services:
       - --v=0
       - --minloglevel=0
       - --timezone_name=+08:00
+      - --heartbeat_interval_secs=1
     depends_on:
       - metad0
       - metad1
@@ -235,9 +241,10 @@ services:
       - --log_dir=/logs
       - --v=0
       - --minloglevel=0
-      - --enable_authorize
+      - --enable_authorize=true
       - --timezone_name=+08:00
       - --system_memory_high_watermark_ratio=0.99
+      - --heartbeat_interval_secs=1
     depends_on:
       - metad0
       - metad1
@@ -273,8 +280,10 @@ services:
       - --log_dir=/logs
       - --v=0
       - --minloglevel=0
+      - --enable_authorize=true
       - --timezone_name=+08:00
       - --system_memory_high_watermark_ratio=0.99
+      - --heartbeat_interval_secs=1
     depends_on:
       - metad0
       - metad1
@@ -310,8 +319,10 @@ services:
       - --log_dir=/logs
       - --v=0
       - --minloglevel=0
+      - --enable_authorize=true
       - --timezone_name=+08:00
       - --system_memory_high_watermark_ratio=0.99
+      - --heartbeat_interval_secs=1
     depends_on:
       - metad0
       - metad1