mysql queries per. second estimated

mysql_qps.sql

SELECT MAX(                                         -- use MAX to force aggregation
           IF(variable_name='Questions'             -- no. of queries sent to server
           ,   CAST(variable_value AS unsigned)     -- make integer value
           ,   0                                    -- ignore if not 'Questions'
           )
       )
/                                                   -- divide by
       MAX(                                         -- use MAX to force aggregation
           IF(variable_name='Uptime'                -- no. of seconds the server is up
           ,   CAST(variable_value AS unsigned)     -- make integer value
           ,   0                                    -- ignore if not 'Uptime'
           )
       ) AS queries_per_second
FROM   information_schema.GLOBAL_STATUS 
WHERE  variable_name in ('Questions', 'Uptime');

from http://forge.mysql.com/tools/tool.php?id=144