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CREATE EXTERNAL RESOURCE POOL (Transact-SQL)
 

Updated: March 21, 2016

THIS TOPIC APPLIES TO: yesSQL Server (starting with 2016) noAzure SQL Database noAzure SQL Data Warehouse noParallel Data Warehouse

Creates an external pool used to define resources for external processes. For R Services the external pool governs rterm.exe, BxlServer.exe, and other processes spawned by them. A resource pool represents a subset of the physical resources (memory and CPUs) 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.

Topic link icon  Transact-SQL Syntax Conventions.

CREATE EXTERNAL RESOURCE POOL pool_name  
[ WITH (  
    [ MAX_CPU_PERCENT = value ]  
    [ [ , ] AFFINITY CPU =    
            {  
                AUTO   
              | ( <cpu_range_spec> )   
              | NUMANODE = ( <NUMA_node_id> )   
            } ]   
    [ [ , ] MAX_MEMORY_PERCENT = value ]  
    [ [ , ] MAX_PROCESSES = value ]   
    )   
]  
[ ; ]  
  
<CPU_range_spec> ::=    
{ CPU_ID | CPU_ID  TO CPU_ID } [ ,...n ]  

pool_name
Is the user-defined name for the external 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.

MAX_CPU_PERCENT =value
Specifies the maximum average CPU bandwidth that all requests in the external 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.

AFFINITY {CPU = AUTO | ( <CPU_range_spec> ) | NUMANODE = (<NUMA_node_range_spec>)}
Attach the external resource pool to specific CPUs. The default value is AUTO.

AFFINITY CPU = ( <CPU_range_spec> ) maps the external resource pool to the SQL Server CPUs identified by the given CPU_IDs.

When you use AFFINITY NUMANODE = ( <NUMA_node_range_spec> ), the external resource pool is affinitized to the SQL Server physical CPUs that correspond to the given NUMA node or range of nodes.

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

MAX_PROCESSES =value
Specifies the maximum number of processes allowed for the external resource pool. Specify 0 to set an unlimited threshold for the pool which will be bound only be computer resources. The default is 0.

The Database Engine implements resource pool when you execute the ALTER RESOURCE GOVERNOR RECONFIGURE statement.

For more information on resource pools, see Resource Governor Resource Pool, sys.resource_governor_external_resource_pools (Transact-SQL), and sys.dm_resource_governor_external_resource_pool_affinity (Transact-SQL).

Requires CONTROL SERVER permission.

The following statement defines an external pool that restricts CPU usage to 75 percent and the maximum memory to 30 percent of the available memory on the computer.

CREATE EXTERNAL RESOURCE POOL ep_1  
WITH (  
    MAX_CPU_PERCENT = 75  
    , AFFINITY CPU = AUTO  
    , MAX_MEMORY_PERCENT = 30  
);  
GO  
ALTER RESOURCE GOVERNOR RECONFIGURE;  
GO  

external scripts enabled Server Configuration Option
sp_execute_external_script (Transact-SQL)
SQL Server R Services
Known Issues for SQL Server R Services
ALTER EXTERNAL RESOURCE POOL (Transact-SQL)
DROP EXTERNAL RESOURCE POOL (Transact-SQL)
CREATE RESOURCE POOL (Transact-SQL)
CREATE WORKLOAD GROUP (Transact-SQL)
Resource Governor Resource Pool
sys.resource_governor_external_resource_pools (Transact-SQL)
sys.dm_resource_governor_external_resource_pool_affinity (Transact-SQL)
ALTER RESOURCE GOVERNOR (Transact-SQL)