SQL Server 2005 Ring Buffers stored information related to CPU usage. This information is updated every 1 minute. So at any given point of time you can trace back the CPU usage for 4 hours 15 minutes. A sample output below shows the SQL instance CPU utilization against the other processes (active on the server) CPU utilization. This will definitely help us identify whether the SQL Server process is actually driving CPU.
Sample Output:
| Event Time | SQL Process Utilization | System Idle | Other Process Utilization |
| 2009-11-19 20:00:49.947 | 0 | 96 | 4 |
| 2009-11-19 19:59:49.933 | 0 | 92 | 8 |
| 2009-11-19 19:58:49.910 | 0 | 91 | 9 |
| 2009-11-19 19:57:49.893 | 0 | 92 | 8 |
For SQL Server 2005:
declare @ts_now bigint
select @ts_now = cpu_ticks / convert(float, cpu_ticks_in_ms) from sys.dm_os_sys_info
select record_id,
dateadd(ms, -1 * (@ts_now - [timestamp]), GetDate()) as EventTime,
SQLProcessUtilization,
SystemIdle,
100 - SystemIdle - SQLProcessUtilization as OtherProcessUtilization
from (
select
record.value('(./Record/@id)[1]', 'int') as record_id,
record.value('(./Record/SchedulerMonitorEvent/SystemHealth/SystemIdle)[1]', 'int') as SystemIdle,
record.value('(./Record/SchedulerMonitorEvent/SystemHealth/ProcessUtilization)[1]', 'int') as SQLProcessUtilization,
timestamp
from (
select timestamp, convert(xml, record) as record
from sys.dm_os_ring_buffers
where ring_buffer_type = N'RING_BUFFER_SCHEDULER_MONITOR'
and record like '%<SystemHealth>%') as x
) as y
order by record_id desc
For SQL Server 2008:
declare @ts_now bigint
select @ts_now = ms_ticks from
sys.dm_os_sys_info
select record_id, dateadd (ms, (y.[timestamp] -@ts_now), GETDATE()) as EventTime,
SQLProcessUtilization,
SystemIdle,
100 - SystemIdle - SQLProcessUtilization as OtherProcessUtilization
from (
select
record.value('(./Record/@id)[1]', 'int') as record_id,
record.value('(./Record/SchedulerMonitorEvent/SystemHealth/SystemIdle)[1]', 'int')
as SystemIdle,
record.value('(./Record/SchedulerMonitorEvent/SystemHealth/ProcessUtilization)[1]',
'int') as SQLProcessUtilization,
timestamp
from (
select timestamp, convert(xml, record) as record
from sys.dm_os_ring_buffers
where ring_buffer_type = N'RING_BUFFER_SCHEDULER_MONITOR'
and record like '%<SystemHealth>%') as x
) as y
order by record_id desc
