<< std::make_pair( "delete_success", nDeleteSuccess )
<< std::make_pair( "insert_failed", nInsertFailed )
<< std::make_pair( "delete_failed", nDeleteFailed )
<< std::make_pair( "delete_success", nDeleteSuccess )
<< std::make_pair( "insert_failed", nInsertFailed )
<< std::make_pair( "delete_failed", nDeleteFailed )