Is ity possible to find how many processors SQL server is using ? What is HIDDEN ONLINE mean ?

When I execute this below Query I got the following output.   It saying 3 of them are VISIBLE ONLINE and remaining two  it saying HIDDEN ONLINE. Does SQL server uses the Hidden CPUs ?

select  scheduler_id,cpu_id, status, is_online from sys.dm_os_schedulers

scheduler_id      cpu_id      status                                 is_online
0                       0            VISIBLE ONLINE                   1
1                       1           VISIBLE ONLINE                   1
1048578               0           HIDDEN ONLINE                    1
1048579               1           HIDDEN ONLINE                   1
1048576               0           VISIBLE ONLINE (DAC)           1
Varshini SAsked:
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Steve WalesSenior Database AdministratorCommented:
The valid values for this view are all defined in the documentation:

HIDDEN means that they are reserved for system requests.
VISIBLE means they are available for user requests.
Vitor MontalvãoMSSQL Senior EngineerCommented:


Indicates the status of the scheduler. Can be one of the following values:







Is not nullable.

HIDDEN schedulers are used to process requests that are internal to the Database Engine. VISIBLE schedulers are used to process user requests.

OFFLINE schedulers map to processors that are offline in the affinity mask and are, therefore, not being used to process any requests. ONLINE schedulers map to processors that are online in the affinity mask and are available to process threads.

DAC indicates the scheduler is running under a dedicated administrator connection.

HOT ADDED indicates the schedulers were added in response to a hot add CPU event."

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Vitor MontalvãoMSSQL Senior EngineerCommented:
But for knowing how many CPU's there's a simple query for that:

select cpu_count from sys.dm_os_sys_info 

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Microsoft SQL Server 2008

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