diff --git a/cpp/src/db/ExecutionEngine.h b/cpp/src/db/ExecutionEngine.h
index 4503e5565066b489fb8786d6559ecbc6a3ea8012..cd9e071b9c7412570d782974e5f2df9107d14f3d 100644
--- a/cpp/src/db/ExecutionEngine.h
+++ b/cpp/src/db/ExecutionEngine.h
@@ -19,6 +19,7 @@ enum class EngineType {
     FAISS_IDMAP = 1,
     FAISS_IVFFLAT,
     FAISS_IVFSQ8,
+    MAX_VALUE = FAISS_IVFSQ8,
 };
 
 class ExecutionEngine {
diff --git a/cpp/src/server/RequestTask.cpp b/cpp/src/server/RequestTask.cpp
index d4051eba667931c25c48a2470c0cdba19a6d5071..af6264da908059e46d3a5d944d2731bc338a659b 100644
--- a/cpp/src/server/RequestTask.cpp
+++ b/cpp/src/server/RequestTask.cpp
@@ -148,17 +148,17 @@ ServerError CreateTableTask::OnExecute() {
         ServerError res = SERVER_SUCCESS;
         res = ValidateTableName(schema_.table_name);
         if(res != SERVER_SUCCESS) {
-            return res;
+            return SetError(res, "Invalid table name: " + schema_.table_name);
         }
 
         res = ValidateTableDimension(schema_.dimension);
         if(res != SERVER_SUCCESS) {
-            return res;
+            return SetError(res, "Invalid table dimension: " + std::to_string(schema_.dimension));
         }
 
         res = ValidateTableIndexType(schema_.index_type);
         if(res != SERVER_SUCCESS) {
-            return res;
+            return SetError(res, "Invalid index type: " + std::to_string(schema_.index_type));
         }
 
         //step 2: construct table schema
@@ -203,7 +203,7 @@ ServerError DescribeTableTask::OnExecute() {
         ServerError res = SERVER_SUCCESS;
         res = ValidateTableName(table_name_);
         if(res != SERVER_SUCCESS) {
-            return res;
+            return SetError(res, "Invalid table name: " + table_name_);
         }
 
         //step 2: get table info
@@ -243,12 +243,20 @@ ServerError BuildIndexTask::OnExecute() {
         TimeRecorder rc("BuildIndexTask");
 
         //step 1: check arguments
-        if(table_name_.empty()) {
-            return SetError(SERVER_INVALID_TABLE_NAME, "Empty table name");
+        ServerError res = SERVER_SUCCESS;
+        res = ValidateTableName(table_name_);
+        if(res != SERVER_SUCCESS) {
+            return SetError(res, "Invalid table name: " + table_name_);
+        }
+
+        bool has_table = false;
+        engine::Status stat = DBWrapper::DB()->HasTable(table_name_, has_table);
+        if(!has_table) {
+            return SetError(SERVER_TABLE_NOT_EXIST, "Table " + table_name_ + " not exists");
         }
 
         //step 2: check table existence
-        engine::Status stat = DBWrapper::DB()->BuildIndex(table_name_);
+        stat = DBWrapper::DB()->BuildIndex(table_name_);
         if(!stat.ok()) {
             return SetError(SERVER_BUILD_INDEX_ERROR, "Engine failed: " + stat.ToString());
         }
@@ -281,8 +289,9 @@ ServerError HasTableTask::OnExecute() {
         ServerError res = SERVER_SUCCESS;
         res = ValidateTableName(table_name_);
         if(res != SERVER_SUCCESS) {
-            return res;
+            return SetError(res, "Invalid table name: " + table_name_);
         }
+
         //step 2: check table existence
         engine::Status stat = DBWrapper::DB()->HasTable(table_name_, has_table_);
         if(!stat.ok()) {
@@ -316,7 +325,7 @@ ServerError DeleteTableTask::OnExecute() {
         ServerError res = SERVER_SUCCESS;
         res = ValidateTableName(table_name_);
         if(res != SERVER_SUCCESS) {
-            return res;
+            return SetError(res, "Invalid table name: " + table_name_);
         }
 
         //step 2: check table existence
@@ -400,7 +409,7 @@ ServerError AddVectorTask::OnExecute() {
         ServerError res = SERVER_SUCCESS;
         res = ValidateTableName(table_name_);
         if(res != SERVER_SUCCESS) {
-            return res;
+            return SetError(res, "Invalid table name: " + table_name_);
         }
 
         if(record_array_.empty()) {
@@ -491,7 +500,7 @@ ServerError SearchVectorTask::OnExecute() {
         ServerError res = SERVER_SUCCESS;
         res = ValidateTableName(table_name_);
         if(res != SERVER_SUCCESS) {
-            return res;
+            return SetError(res, "Invalid table name: " + table_name_);
         }
 
         if(top_k_ <= 0) {
@@ -606,7 +615,7 @@ ServerError GetTableRowCountTask::OnExecute() {
         ServerError res = SERVER_SUCCESS;
         res = ValidateTableName(table_name_);
         if(res != SERVER_SUCCESS) {
-            return res;
+            return SetError(res, "Invalid table name: " + table_name_);
         }
 
         //step 2: get row count
diff --git a/cpp/src/utils/ValidationUtil.cpp b/cpp/src/utils/ValidationUtil.cpp
index a1e3f0dffcce8711faff32b530a89f76828be7c6..53f00a4fc7bedb2a553b70b26a82827762b83853 100644
--- a/cpp/src/utils/ValidationUtil.cpp
+++ b/cpp/src/utils/ValidationUtil.cpp
@@ -56,18 +56,13 @@ ValidateTableDimension(int64_t dimension) {
 
 ServerError
 ValidateTableIndexType(int32_t index_type) {
-    auto engine_type = engine::EngineType(index_type);
-    switch (engine_type) {
-        case engine::EngineType::FAISS_IDMAP:
-        case engine::EngineType::FAISS_IVFFLAT:
-        case engine::EngineType::FAISS_IVFSQ8:{
-            SERVER_LOG_DEBUG << "Index type: " << index_type;
-            return SERVER_SUCCESS;
-        }
-        default: {
-            return SERVER_INVALID_INDEX_TYPE;
-        }
+    int engine_type = (int)engine::EngineType(index_type);
+    if(engine_type <= 0 || engine_type > (int)engine::EngineType::MAX_VALUE) {
+        return SERVER_INVALID_INDEX_TYPE;
     }
+
+    SERVER_LOG_DEBUG << "Index type: " << index_type;
+    return SERVER_SUCCESS;
 }
 
 }
diff --git a/cpp/unittest/utils/ValidationUtilTest.cpp b/cpp/unittest/utils/ValidationUtilTest.cpp
index 095614e3257935e85f2e72de15d6b0e761855d5d..38fc63a10d54934224533600d0d76b054eea187c 100644
--- a/cpp/unittest/utils/ValidationUtilTest.cpp
+++ b/cpp/unittest/utils/ValidationUtilTest.cpp
@@ -7,9 +7,11 @@
 
 #include "utils/ValidationUtil.h"
 #include "utils/Error.h"
+#include "db/ExecutionEngine.h"
 
 #include <string>
 
+using namespace zilliz::milvus;
 using namespace zilliz::milvus::server;
 
 TEST(ValidationUtilTest, TableNameTest) {
@@ -53,9 +55,9 @@ TEST(ValidationUtilTest, TableDimensionTest) {
 }
 
 TEST(ValidationUtilTest, TableIndexTypeTest) {
-    ASSERT_EQ(ValidateTableIndexType(0), SERVER_INVALID_INDEX_TYPE);
-    ASSERT_EQ(ValidateTableIndexType(1), SERVER_SUCCESS);
-    ASSERT_EQ(ValidateTableIndexType(2), SERVER_SUCCESS);
-    ASSERT_EQ(ValidateTableIndexType(3), SERVER_INVALID_INDEX_TYPE);
-    ASSERT_EQ(ValidateTableIndexType(4), SERVER_INVALID_INDEX_TYPE);
+    ASSERT_EQ(ValidateTableIndexType((int)engine::EngineType::INVALID), SERVER_INVALID_INDEX_TYPE);
+    for(int i = 1; i <= (int)engine::EngineType::MAX_VALUE; i++) {
+        ASSERT_EQ(ValidateTableIndexType(i), SERVER_SUCCESS);
+    }
+    ASSERT_EQ(ValidateTableIndexType((int)engine::EngineType::MAX_VALUE + 1), SERVER_INVALID_INDEX_TYPE);
 }