55a64ab8_PHP__Statistics___Manual_mysqlnd_statistics__Result_Set_Description
[Statistic] rows_buffered_from_client_normal, rows_buffered_from_client_ps [Scope] Connection [Notes] Examples of queries that will buffer results: mysqli_query(), mysqli_store_result() [Description] 
Total number of successfully buffered rows originating from a "normal" query or a prepared statement. This is the number of rows that have been fetched from MySQL and buffered on client. Note that there are two distinct statistics on rows that have been buffered (MySQL to mysqlnd internal buffer) and buffered rows that have been fetched by the client application (mysqlnd internal buffer to client application). If the number of buffered rows is higher than the number of fetched buffered rows it can mean that the client application runs queries that cause larger result sets than needed resulting in rows not read by the client.
PHP: Statistics - Manual
Description