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CREATE RESOURCE POOL (Transact-SQL)

Creates a Resource Governor resource pool in SQL Server. A resource pool represents a subset of the physical resources (memory, CPUs and IO) of an instance of the Database Engine. Resource Governor enables a database administrator to distribute server resources among resource pools, up to a maximum of 64 pools. Resource Governor is not available in every edition of SQL Server. For a list of features that are supported by the editions of SQL Server, see Features Supported by the Editions of SQL Server 2014.

Applies to: SQL Server (SQL Server 2008 through current version).

Topic link icon Transact-SQL Syntax Conventions.

CREATE RESOURCE POOL pool_name
[ WITH
    (
        [ MIN_CPU_PERCENT = value ]
        [ [ , ] MAX_CPU_PERCENT = value ] 
        [ [ , ] CAP_CPU_PERCENT = value ] 
        [ [ , ] AFFINITY {SCHEDULER =
                  AUTO | ( <scheduler_range_spec> ) 
                | NUMANODE = ( <NUMA_node_range_spec> )} ] 
        [ [ , ] MIN_MEMORY_PERCENT = value ]
        [ [ , ] MAX_MEMORY_PERCENT = value ]
        [ [ , ] MIN_IOPS_PER_VOLUME = value ]
        [ [ , ] MAX_IOPS_PER_VOLUME = value ]
    ) 
]
[;]

<scheduler_range_spec> ::=
{ SCHED_ID | SCHED_ID TO SCHED_ID }[,…n]

<NUMA_node_range_spec> ::=
{ NUMA_node_ID | NUMA_node_ID TO NUMA_node_ID }[,…n]

pool_name

Is the user-defined name for the resource pool. pool_name is alphanumeric, can be up to 128 characters, must be unique within an instance of SQL Server, and must comply with the rules for identifiers.

MIN_CPU_PERCENT =value

Specifies the guaranteed average CPU bandwidth for all requests in the resource pool when there is CPU contention. value is an integer with a default setting of 0. The allowed range for value is from 0 through 100.

MAX_CPU_PERCENT =value

Specifies the maximum average CPU bandwidth that all requests in resource pool will receive when there is CPU contention. value is an integer with a default setting of 100. The allowed range for value is from 1 through 100.

CAP_CPU_PERCENT =value

Applies to: SQL Server 2012 through SQL Server 2014.

Specifies a hard cap on the CPU bandwidth that all requests in the resource pool will receive. Limits the maximum CPU bandwidth level to be the same as the specified value. value is an integer with a default setting of 100. The allowed range for value is from 1 through 100.

AFFINITY {SCHEDULER = AUTO | ( <scheduler_range_spec> ) | NUMANODE = (<NUMA_node_range_spec>)}

Applies to: SQL Server 2012 through SQL Server 2014.

Attach the resource pool to specific schedulers. The default value is AUTO.

AFFINITY SCHEDULER = ( <scheduler_range_spec> ) maps the resource pool to the SQL Server schedules identified by the given IDs. These IDs map to the values in the scheduler_id column in sys.dm_os_schedulers (Transact-SQL).

When you use AFFINITY NUMANODE = ( <NUMA_node_range_spec> ), the resource pool is affinitized to the SQL Server schedulers that map to the physical CPUs that correspond to the given NUMA node or range of nodes. You can use the following Transact-SQL query to discover the mapping between the physical NUMA configuration and the SQL Server scheduler IDs.

SELECT osn.memory_node_id AS [numa_node_id], sc.cpu_id, sc.scheduler_id
FROM sys.dm_os_nodes AS osn
INNER JOIN sys.dm_os_schedulers AS sc 
    ON osn.node_id = sc.parent_node_id 
    AND sc.scheduler_id < 1048576;
MIN_MEMORY_PERCENT =value

Specifies the minimum amount of memory reserved for this resource pool that can not be shared with other resource pools. value is an integer with a default setting of 0 The allowed range for value is from 0 to 100.

MAX_MEMORY_PERCENT =value

Specifies the total server memory that can be used by requests in this resource pool. value is an integer with a default setting of 100. The allowed range for value is from 1 through 100.

MIN_IOPS_PER_VOLUME =value

Applies to: SQL Server 2014 through SQL Server 2014.

Specifies the minimum I/O operations per second (IOPS) per disk volume to reserve for the resource pool. The allowed range for value is from 0 through 2^31-1 (2,147,483,647). Specify 0 to indicate no minimum threshold for the pool. The default is 0.

MAX_IOPS_PER_VOLUME =value

Applies to: SQL Server 2014 through SQL Server 2014.

Specifies the maximum I/O operations per second (IOPS) per disk volume to allow for the resource pool. The allowed range for value is from 0 through 2^31-1 (2,147,483,647). Specify 0 to set an unlimited threshold for the pool. The default is 0.

If the MAX_IOPS_PER_VOLUME for a pool is set to 0, the pool is not governed at all and can take all the IOPS in the system even if other pools have MIN_IOPS_PER_VOLUME set. For this case, we recommend that you set the MAX_IOPS_PER_VOLUME value for this pool to a high number (for example, the maximum value 2^31-1) if you want this pool to be governed for IO.

MIN_IOPS_PER_VOLUME and MAX_IOPS_PER_VOLUME specify the minimum and maximum reads or writes per second. These reads or writes can be of any size and do not indicate minimum or maximum throughput.

The values for MAX_CPU_PERCENT and MAX_MEMORY_PERCENT must be greater than or equal to the values for MIN_CPU_PERCENT and MIN_MEMORY_PERCENT, respectively.

CAP_CPU_PERCENT differs from MAX_CPU_PERCENT in that workloads associated with the pool can use CPU capacity above the value of MAX_CPU_PERCENT if it is available, but not above the value of CAP_CPU_PERCENT.

The total CPU percentage for each affinitized component (scheduler(s) or NUMA node(s)) should not exceed 100%.

Requires CONTROL SERVER permission.

The following example shows how to create a resource pool named bigPool. This pool uses the default Resource Governor settings.

CREATE RESOURCE POOL bigPool;
GO
ALTER RESOURCE GOVERNOR RECONFIGURE;
GO

The following example sets the CAP_CPU_PERCENT to a hard cap of 30% and sets AFFINITY SCHEDULER to a range of 0 to 63, 128 to 191.

Applies to: SQL Server 2012 through SQL Server 2014.

CREATE RESOURCE POOL PoolAdmin
WITH (
     MIN_CPU_PERCENT = 10,
     MAX_CPU_PERCENT = 20,
     CAP_CPU_PERCENT = 30,
     AFFINITY SCHEDULER = (0 TO 63, 128 TO 191),
     MIN_MEMORY_PERCENT = 5,
     MAX_MEMORY_PERCENT = 15
      );

The following example sets MIN_IOPS_PER_VOLUME to <some value> and MAX_IOPS_PER_VOLUME to <some value>. These values govern the physical I/O read and write operations that are available for the resource pool.

Applies to: SQL Server 2014 through SQL Server 2014.

CREATE RESOURCE POOL PoolAdmin
WITH (
    MIN_IOPS_PER_VOLUME = 20,
    MAX_IOPS_PER_VOLUME = 100
      );

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