diff --git a/cpp/src/server/RequestTask.cpp b/cpp/src/server/RequestTask.cpp
index 925bc601cc..d2c2474999 100644
--- a/cpp/src/server/RequestTask.cpp
+++ b/cpp/src/server/RequestTask.cpp
@@ -482,7 +482,11 @@ ServerError SearchVectorTask::OnExecute() {
         engine::QueryResults results;
         uint64_t record_count = (uint64_t)record_array_.size();
 
-        SERVER_LOG_DEBUG << file_id_array_ << std::endl;
+        SERVER_LOG_DEBUG << "file_id_array_: ";
+        for (auto& file_id : file_id_array_) {
+            SERVER_LOG_DEBUG << file_id;
+        }
+
         if(file_id_array_.empty()) {
             stat = DBWrapper::DB()->Query(table_name_, (size_t) top_k_, record_count, vec_f.data(), dates, results);
         } else {