diff --git a/core/src/scheduler/task/SearchTask.cpp b/core/src/scheduler/task/SearchTask.cpp
index f70fd65dff..7a71065346 100644
--- a/core/src/scheduler/task/SearchTask.cpp
+++ b/core/src/scheduler/task/SearchTask.cpp
@@ -317,6 +317,9 @@ XSearchTask::Execute() {
                 std::unique_lock<std::mutex> lock(search_job->mutex());
                 XSearchTask::MergeTopkToResultSet(output_ids, output_distance, spec_k, nq, topk, ascending_reduce,
                                                   search_job->GetResultIds(), search_job->GetResultDistances());
+                LOG_ENGINE_DEBUG_ << "Merged result: "
+                                  << "nq = " << nq << ", topk = " << topk << ", len of ids = " << output_ids.size()
+                                  << ", len of distance = " << output_distance.size();
             }
 
             // span = rc.RecordSection(hdr + ", reduce topk");
diff --git a/core/src/server/grpc_impl/GrpcRequestHandler.cpp b/core/src/server/grpc_impl/GrpcRequestHandler.cpp
index 2bd7eed694..a0d072891d 100644
--- a/core/src/server/grpc_impl/GrpcRequestHandler.cpp
+++ b/core/src/server/grpc_impl/GrpcRequestHandler.cpp
@@ -519,6 +519,9 @@ GrpcRequestHandler::Search(::grpc::ServerContext* context, const ::milvus::grpc:
     Status status = request_handler_.Search(GetContext(context), request->collection_name(), vectors, request->topk(),
                                             json_params, partitions, file_ids, result);
 
+    LOG_SERVER_DEBUG_C << "row num = " << result.row_num_ << ", id list length = " << result.id_list_.size()
+                       << ", distance list length = " << result.distance_list_.size();
+
     // step 5: construct and return result
     ConstructResults(result, response);