diff --git a/src/observer/virtual_table/ob_information_columns_table.cpp b/src/observer/virtual_table/ob_information_columns_table.cpp
index 97b8ea90ac..d6b85f04a3 100644
--- a/src/observer/virtual_table/ob_information_columns_table.cpp
+++ b/src/observer/virtual_table/ob_information_columns_table.cpp
@@ -94,12 +94,12 @@ int ObInfoSchemaColumnsTable::inner_get_next_row(common::ObNewRow *&row)
       } else if (OB_UNLIKELY(NULL == (tmp_ptr = static_cast<char *>(allocator_->alloc(
                              OB_MAX_SYS_PARAM_NAME_LENGTH))))) {
         ret = OB_ALLOCATE_MEMORY_FAILED;
-        SERVER_LOG(ERROR, "fail to alloc memory", K(ret));
+        SERVER_LOG(WARN, "fail to alloc memory", K(ret));
       } else if (FALSE_IT(data_type_str_ = static_cast<char *>(tmp_ptr))) {
       } else if (OB_UNLIKELY(NULL == (tmp_ptr = static_cast<char *>(allocator_->alloc(
                              OB_MAX_SYS_PARAM_NAME_LENGTH))))) {
         ret = OB_ALLOCATE_MEMORY_FAILED;
-        SERVER_LOG(ERROR, "fail to alloc memory", K(ret));
+        SERVER_LOG(WARN, "fail to alloc memory", K(ret));
       } else {
         column_type_str_ = static_cast<char *>(tmp_ptr);
         column_type_str_len_ = OB_MAX_SYS_PARAM_NAME_LENGTH;
@@ -288,7 +288,7 @@ int ObInfoSchemaColumnsTable::iterate_table_schema_array(const bool is_filter_ta
                                                      last_db_schema_idx,
                                                      i,
                                                      is_filter_table_schema))) {
-        SERVER_LOG(ERROR, "fail to iterate all table columns. ", K(ret));
+        SERVER_LOG(WARN, "fail to iterate all table columns. ", K(ret));
       }
     }
   }
@@ -446,14 +446,14 @@ int ObInfoSchemaColumnsTable::get_type_str(
                                OB_MAX_SYS_PARAM_NAME_LENGTH,
                                OB_MAX_EXTENDED_TYPE_INFO_LENGTH))))) {
         ret = OB_ALLOCATE_MEMORY_FAILED;
-        SERVER_LOG(ERROR, "fail to alloc memory", K(ret));
+        SERVER_LOG(WARN, "fail to alloc memory", K(ret));
       } else if (FALSE_IT(data_type_str_ = static_cast<char *>(tmp_ptr))) {
       } else if (OB_UNLIKELY(NULL == (tmp_ptr = static_cast<char *>(allocator_->realloc(
                                column_type_str_,
                                OB_MAX_SYS_PARAM_NAME_LENGTH,
                                OB_MAX_EXTENDED_TYPE_INFO_LENGTH))))) {
         ret = OB_ALLOCATE_MEMORY_FAILED;
-        SERVER_LOG(ERROR, "fail to alloc memory", K(ret));
+        SERVER_LOG(WARN, "fail to alloc memory", K(ret));
       } else {
         pos = 0;
         column_type_str_ = static_cast<char *>(tmp_ptr);
@@ -548,7 +548,7 @@ int ObInfoSchemaColumnsTable::fill_row_cells(const ObString &database_name,
               int64_t pos = 0;
               if (OB_UNLIKELY(NULL == (buf = static_cast<char*>(allocator_->alloc(buf_len))))) {
                 ret = OB_ALLOCATE_MEMORY_FAILED;
-                SERVER_LOG(ERROR, "fail to allocate memory", K(ret));
+                SERVER_LOG(WARN, "fail to allocate memory", K(ret));
               } else if (def_obj.is_bit()) {
                 if (OB_FAIL(def_obj.print_varchar_literal(buf, buf_len, pos, TZ_INFO(session_)))) {
                   SERVER_LOG(WARN, "fail to print varchar literal", K(ret), K(def_obj), K(buf_len), K(pos), K(buf));
@@ -570,7 +570,7 @@ int ObInfoSchemaColumnsTable::fill_row_cells(const ObString &database_name,
                            K(ret), K(def_obj));
               } else if (OB_ISNULL(res_cell)) {
                 ret = OB_ERR_UNEXPECTED;
-                SERVER_LOG(ERROR, "succ to cast to ObVarcharType, but res_cell is NULL",
+                SERVER_LOG(WARN, "succ to cast to ObVarcharType, but res_cell is NULL",
                            K(ret), K(def_obj));
               } else {
                 cells[cell_idx] = *res_cell;
@@ -954,7 +954,7 @@ int ObInfoSchemaColumnsTable::fill_row_cells(const common::ObString &database_na
               int64_t pos = 0;
               if (OB_UNLIKELY(NULL == (buf = static_cast<char*>(allocator_->alloc(buf_len))))) {
                 ret = OB_ALLOCATE_MEMORY_FAILED;
-                SERVER_LOG(ERROR, "fail to allocate memory", K(ret));
+                SERVER_LOG(WARN, "fail to allocate memory", K(ret));
               } else if (column_item.default_value_.is_bit()) {
                 if (OB_FAIL(column_item.default_value_.print_varchar_literal(buf, buf_len, pos, TZ_INFO(session_)))) {
                   SERVER_LOG(WARN, "fail to print varchar literal", K(ret), K(column_item.default_value_), K(buf_len), K(pos), K(buf));
@@ -980,7 +980,7 @@ int ObInfoSchemaColumnsTable::fill_row_cells(const common::ObString &database_na
                            K(ret), K(column_item.default_value_));
               } else if (OB_ISNULL(res_cell)) {
                 ret = OB_ERR_UNEXPECTED;
-                SERVER_LOG(ERROR, "succ to cast to ObVarcharType, but res_cell is NULL",
+                SERVER_LOG(WARN, "succ to cast to ObVarcharType, but res_cell is NULL",
                            K(ret), K(column_item.default_value_));
               } else {
                 cells[cell_idx] = *res_cell;
diff --git a/src/share/schema/ob_schema_getter_guard.cpp b/src/share/schema/ob_schema_getter_guard.cpp
index 174867e398..870a554d85 100644
--- a/src/share/schema/ob_schema_getter_guard.cpp
+++ b/src/share/schema/ob_schema_getter_guard.cpp
@@ -3376,7 +3376,7 @@ int ObSchemaGetterGuard::check_single_table_priv(const ObSessionPrivInfo &sessio
           if (OB_FAIL(get_user_info(tenant_id, session_priv.user_id_, user_info))) {
             LOG_WARN("failed to get user info", KR(ret), K(tenant_id), K(session_priv.user_id_));
           } else if (NULL == user_info) {
-            ret = OB_ERR_UNEXPECTED;
+            ret = OB_USER_NOT_EXIST;
             LOG_WARN("user info is null", KR(ret), K(session_priv.user_id_));
           } else {
             const ObSEArray<uint64_t, 8> &role_id_array = user_info->get_role_id_array();
@@ -3473,7 +3473,12 @@ int ObSchemaGetterGuard::check_db_priv(const ObSessionPrivInfo &session_priv,
       const ObUserInfo *user_info = NULL;
       //bool is_grant_role = false;
       OZ (get_user_info(tenant_id, session_priv.user_id_, user_info), session_priv.user_id_);
-      CK (OB_NOT_NULL(user_info));
+      if (OB_SUCC(ret)) {
+        if (NULL == user_info) {
+          ret = OB_USER_NOT_EXIST;
+          LOG_WARN("user info is null", KR(ret), K(session_priv.user_id_));
+        }
+      }
       if (OB_SUCC(ret)) {
         const ObSEArray<uint64_t, 8> &role_id_array = user_info->get_role_id_array();
         for (int i = 0; OB_SUCC(ret) && i < role_id_array.count(); ++i) {