sys.dm_os_memory_objects (Transact-SQL)
Returns memory objects that are currently allocated by SQL Server. You can use sys.dm_os_memory_objects to analyze memory use and to identify possible memory leaks.
Column name |
Data type |
Description |
|---|---|---|
memory_object_address |
varbinary(8) |
Address of the memory object. Is not nullable. |
parent_address |
varbinary(8) |
Address of the parent memory object. Is nullable. |
pages_in_bytes |
bigint |
Amount of memory in bytes that is allocated by this instance of the memory object. Is not nullable. |
creation_options |
int |
Internal use only. Is nullable. |
bytes_used |
bigint |
Internal use only. Is nullable. |
type |
nvarchar(60) |
Type of memory object. This indicates some component that this memory object belongs to, or the function of the memory object. Is nullable. |
name |
varchar(128) |
Internal use only. Nullable. |
memory_node_id |
smallint |
ID of a memory node that is being used by this memory object. Is not nullable. |
creation_time |
datetime |
Internal use only. Is nullable. |
page_size_in_bytes |
int |
Size of pages in bytes allocated by this object. Is not nullable. |
max_pages_in_bytes |
bigint |
Maximum amount of memory ever used by this memory object. Is not nullable. |
page_allocator_address |
varbinary(8) |
Memory address of page allocator. Is not nullable. For more information, see sys.dm_os_memory_clerks (Transact-SQL). |
creation_stack_address |
varbinary(8) |
Internal use only. Is nullable. |
sequence_num |
int |
Internal use only. Is nullable. |
Permissions
Requires VIEW SERVER STATE permission on the server.
Remarks
Memory objects are heaps. They provide allocations that have a finer granularity than those provided by memory clerks. SQL Server components use memory objects instead of memory clerks. Memory objects use the page allocator interface of the memory clerk to allocate pages. Memory objects do not use virtual or shared memory interfaces. Depending on the allocation patterns, components can create different types of memory objects to allocate regions of arbitrary size.
The typical page size for a memory object is 8 KB. However, incremental memory objects can have page sizes that range from 512 bytes to 8 KB.
Note
Page size is not a maximum allocation. Instead, page size is allocation granularity that is supported by a page allocator and that is implemented by a memory clerk. You can request allocations greater than 8 KB from memory objects.
Compatibility Support
In SQL Server 2012, the following columns have been renamed.
Previous Column Name |
New Column Name |
|---|---|
pages_allocated_count |
pages_in_bytes |
max_pages_allocated_count |
max_pages_in_bytes |
Examples
The following example returns the amount of memory allocated by each memory object type.
SELECT SUM (pages_in_bytes) as 'Bytes Used', type
FROM sys.dm_os_memory_objects
GROUP BY type
ORDER BY 'Bytes Used' DESC;
GO
See Also
Reference
Dynamic Management Views and Functions (Transact-SQL)
SQL Server Operating System Related Dynamic Management Views (Transact-SQL)