mysql_num_rows no funciona con data grande

[kotosh]

probe aumentandole tambien el limite de memoria y funciono:

max_execution_time = 60 ; 30.Maximum execution time of each script, in seconds
max_input_time = 60 ; Maximum amount of time each script may spend parsing request data
memory_limit = 30M ; 16M.Maximum amount of memory a script may consume

Saludos