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sys.dm_db_task_space_usage (Transact-SQL)

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

Note

This view is applicable only to the tempdb database.

Column name

Data type

Description

session_id

smallint

Session ID.

request_id

int

Request 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_id

int

Execution context ID of the task. For more information, see sys.dm_os_tasks (Transact-SQL).

database_id

smallint

Database ID.

user_objects_alloc_page_count

bigint

Number of pages reserved or allocated for user objects by this task.

user_objects_dealloc_page_count

bigint

Number of pages deallocated and no longer reserved for user objects by this task.

internal_objects_alloc_page_count

bigint

Number of pages reserved or allocated for internal objects by this task.

internal_objects_dealloc_page_count

bigint

Number of pages deallocated and no longer reserved for internal objects by this task.

Permissions

Requires VIEW SERVER STATE permission on the server.

Remarks

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.

User Objects

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

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

Physical joins for sys.dm_db_session_task_usage

Relationship Cardinalities

From

To

Relationship

dm_db_task_space_usage.request_id

dm_exec_requests.request_id

One-to-one

dm_db_task_space_usage.session_id

dm_exec_requests.session_id

One-to-one

Examples

For examples that use the sys.dm_db_task_space_usage view, see Troubleshooting Insufficient Disk Space in tempdb.