SELECT
    object_name
   ,Counter_name
   ,cntr_value
   ,ROUND(( cntr_value * 8192.0 ) / 1048576, 0) AS cntr_value_MB
FROM
    sys.dm_os_performance_counters
WHERE
    object_Name LIKE '%Buffer Manager%'
    AND RTRIM(counter_name) IN ( 'Free pages', 'Total pages',
                                 'Database pages' )
UNION SELECT
    object_name
   ,Counter_name
   ,cntr_value
   ,ROUND(( cntr_value / 1024 ), 0) AS cntr_value_MB
FROM
    sys.dm_os_performance_counters
WHERE
    counter_name IN ( 'Target Server Memory (KB)',
                      'Total Server Memory (KB)' )