sys.dm_os_memory_brokers (Transact-SQL)


THIS TOPIC APPLIES TO:yesSQL Server (starting with 2008)noAzure SQL DatabaseyesAzure SQL Data Warehouse yesParallel Data Warehouse

Allocations that are internal to SQL Server use the SQL Server memory manager. Tracking the difference between process memory counters from sys.dm_os_process_memory and internal counters can indicate memory use from external components in the SQL Server memory space.

Memory brokers fairly distribute memory allocations between various components within SQL Server, based on current and projected usage. Memory brokers do not perform allocations. They only track allocations for computing distribution.

The following table provides information about memory brokers.

System_CAPS_ICON_note.jpg Note

To call this from Azure SQL Data Warehouse or Parallel Data Warehouse, use the name sys.dm_pdw_nodes_os_memory_brokers.

Column nameData typeDescription
pool_idintID of the resource pool if it is associated with a Resource Governor pool.
memory_broker_typenvarchar(60)Type of memory broker. There are currently three types of memory brokers in SQL Server, listed below with their descriptions.

 MEMORYBROKER_FOR_CACHE : Memory that is allocated for use by cached objects.

 MEMORYBROKER_FOR_STEAL : Memory that is stolen from the buffer pool. This memory is not available for reuse by other components until it is freed by the current owner.

 MEMORYBROKER_FOR_RESERVE : Memory reserved for future use by currently executing requests.
allocations_kbbigintAmount of memory, in kilobytes (KB), that has been allocated to this type of broker.
allocations_kb_per_secbigintRate of memory allocations in kilobytes (KB) per second. This value can be negative for memory deallocations.
predicted_allocations_kbbigintPredicted amount of allocated memory by the broker. This is based on the memory usage pattern.
target_allocations_kbbigintRecommended amount of allocated memory, in kilobytes (KB), that is based on current settings and the memory usage pattern. This broker should grow to or shrink to this number.
future_allocations_kbbigintProjected number of allocations, in kilobytes (KB), that will be done in the next several seconds.
overall_limit_kbbigintMaximum amount of memory, in kilobytes (KB), that the the broker can allocate.
last_notificationnvarchar(60)Memory usage recommendation that is based on the current settings and usage pattern. Valid values are as follows:



pdw_node_idintApplies to: Azure SQL Data Warehouse, Parallel Data Warehouse

The identifier for the node that this distribution is on.

Requires VIEW SERVER STATE permission on the server.

Dynamic Management Views and Functions (Transact-SQL)
SQL Server Operating System Related Dynamic Management Views (Transact-SQL)

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