diff --git a/cpp/unittest/db/db_tests.cpp b/cpp/unittest/db/db_tests.cpp
index 50724eddc3d513ab084b217f3f4e0cc0a5a9e41a..91b68210719f98a4ab95d0590bef18e04a10735e 100644
--- a/cpp/unittest/db/db_tests.cpp
+++ b/cpp/unittest/db/db_tests.cpp
@@ -25,8 +25,8 @@ namespace {
 
     static const char* TABLE_NAME = "test_group";
     static constexpr int64_t TABLE_DIM = 256;
-    static constexpr int64_t VECTOR_COUNT = 250000;
-    static constexpr int64_t INSERT_LOOP = 10000;
+    static constexpr int64_t VECTOR_COUNT = 25000;
+    static constexpr int64_t INSERT_LOOP = 1000;
     static constexpr int64_t SECONDS_EACH_HOUR = 3600;
     static constexpr int64_t DAY_SECONDS = 24 * 60 * 60;
 
diff --git a/cpp/unittest/db/mem_test.cpp b/cpp/unittest/db/mem_test.cpp
index a612be2bb314802053f3b6886ccff61fe8e0ead3..1429038a2ba216347f3eeb8c0cb16c3e5b8a7090 100644
--- a/cpp/unittest/db/mem_test.cpp
+++ b/cpp/unittest/db/mem_test.cpp
@@ -24,8 +24,6 @@ namespace {
 
 static std::string TABLE_NAME = "test_group";
 static constexpr int64_t TABLE_DIM = 256;
-static constexpr int64_t VECTOR_COUNT = 250000;
-static constexpr int64_t INSERT_LOOP = 10000;
 
 std::string GenTableName() {
     auto now = std::chrono::system_clock::now();
@@ -212,7 +210,7 @@ TEST_F(MemManagerTest2, SERIAL_INSERT_SEARCH_TEST) {
     std::map<int64_t, std::vector<float>> search_vectors;
     {
         engine::IDNumbers vector_ids;
-        int64_t nb = 1024000;
+        int64_t nb = 100000;
         std::vector<float> xb;
         BuildVectors(nb, xb);
         engine::Status status = db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
@@ -224,7 +222,7 @@ TEST_F(MemManagerTest2, SERIAL_INSERT_SEARCH_TEST) {
         std::mt19937 gen(rd());
         std::uniform_int_distribution<int64_t> dis(0, nb - 1);
 
-        int64_t num_query = 20;
+        int64_t num_query = 10;
         for (int64_t i = 0; i < num_query; ++i) {
             int64_t index = dis(gen);
             std::vector<float> search;
diff --git a/cpp/unittest/db/mysql_db_test.cpp b/cpp/unittest/db/mysql_db_test.cpp
index a98959ed9783b5732567983ea9f2d09c6d122e9e..677b310a600ab8ff6fbbb961e96198dd19ba1bb9 100644
--- a/cpp/unittest/db/mysql_db_test.cpp
+++ b/cpp/unittest/db/mysql_db_test.cpp
@@ -22,8 +22,8 @@ namespace {
 
     static const char* TABLE_NAME = "test_group";
     static constexpr int64_t TABLE_DIM = 256;
-    static constexpr int64_t VECTOR_COUNT = 250000;
-    static constexpr int64_t INSERT_LOOP = 10000;
+    static constexpr int64_t VECTOR_COUNT = 25000;
+    static constexpr int64_t INSERT_LOOP = 1000;
 
     engine::meta::TableSchema BuildTableSchema() {
         engine::meta::TableSchema table_info;
diff --git a/cpp/unittest/db/search_test.cpp b/cpp/unittest/db/search_test.cpp
index b8e0ffafffdd2ca3cc4581abc4a6e4e9a10ab4a2..2eb3300bc1f1dab5e38c97bbcbe1248d1808f734 100644
--- a/cpp/unittest/db/search_test.cpp
+++ b/cpp/unittest/db/search_test.cpp
@@ -288,7 +288,7 @@ TEST(DBSearchTest, PARALLEL_TOPK_TEST) {
 
     DoTopk(5, 10, 4, false);
     DoTopk(20005, 998, 123, true);
-    DoTopk(9987, 12, 10, false);
-    DoTopk(77777, 1000, 1, false);
-    DoTopk(5432, 8899, 8899, true);
+//    DoTopk(9987, 12, 10, false);
+//    DoTopk(77777, 1000, 1, false);
+//    DoTopk(5432, 8899, 8899, true);
 }
\ No newline at end of file