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sys.dm_db_task_space_usage (Transact-SQL)


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

Returns page allocation and deallocation activity by task for the database.

System_CAPS_ICON_note.jpg Note

This view is applicable only to the tempdb database.

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_db_task_space_usage.

Column nameData typeDescription
session_idsmallintSession ID.
request_idintRequest ID within the session.

A request is also called a batch and may contain one or more queries. A session may have multiple requests active at the same time. Each query in the request may start multiple threads (tasks), if a parallel execution plan is used.
exec_context_idintExecution context ID of the task. For more information, see sys.dm_os_tasks (Transact-SQL).
database_idsmallintDatabase ID.
user_objects_alloc_page_countbigintNumber of pages reserved or allocated for user objects by this task.
user_objects_dealloc_page_countbigintNumber of pages deallocated and no longer reserved for user objects by this task.
internal_objects_alloc_page_countbigintNumber of pages reserved or allocated for internal objects by this task.
internal_objects_dealloc_page_countbigintNumber of pages deallocated and no longer reserved for internal objects by this task.
pdw_node_idintApplies to: Azure SQL Data Warehouse, Parallel Data Warehouse

The identifier for the node that this distribution is on.

On SQL Server requires VIEW SERVER STATE permission on the server.

On SQL Database Premium Tiers requires the VIEW DATABASE STATE permission in the database. On SQL Database Standard and Basic Tiers requires the SQL Database admin account.

IAM pages are not included in any of the page counts reported by this view.

Page counters are initialized to zero (0) at the start of a request. These values are aggregated at the session level when the request is completed. For more information, see sys.dm_db_session_space_usage (Transact-SQL).

Work table caching, temporary table caching, and deferred drop operations affect the number of pages allocated and deallocated in a specified task.

The following objects are included in the user object page counters:

  • User-defined tables and indexes

  • System tables and indexes

  • Global temporary tables and indexes

  • Local temporary tables and indexes

  • Table variables

  • Tables returned in the table-valued functions

Internal objects are only in tempdb. The following objects are included in the internal object page counters:

  • Work tables for cursor or spool operations and temporary large object (LOB) storage

  • Work files for operations such as a hash join

  • Sort runs

Physical joins for sys.dm_db_session_task_usage


Dynamic Management Views and Functions (Transact-SQL)
Database Related Dynamic Management Views (Transact-SQL)
sys.dm_exec_sessions (Transact-SQL)
sys.dm_exec_requests (Transact-SQL)
sys.dm_os_tasks (Transact-SQL)
sys.dm_db_session_space_usage (Transact-SQL)
sys.dm_db_file_space_usage (Transact-SQL)

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