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-->Applies to: SQL Server (all supported versions)
This section documents dynamic management views (DMV) that are associated with SQL Server Operating System (SQLOS). SQLOS is responsible for managing operating system resources that are specific to SQL Server.
sys.dm_os_buffer_descriptors
sys.dm_os_buffer_pool_extension_configuration
sys.dm_os_child_instances
sys.dm_os_cluster_nodes
sys.dm_os_cluster_properties
sys.dm_os_dispatcher_pools
sys.dm_os_enumerate_fixed_drives
sys.dm_os_host_info
sys.dm_os_hosts
sys.dm_os_latch_stats
sys.dm_os_loaded_modules
sys.dm_os_memory_brokers
sys.dm_os_memory_cache_clock_hands
sys.dm_os_memory_cache_counters
sys.dm_os_memory_cache_entries
sys.dm_os_memory_cache_hash_tables
sys.dm_os_memory_clerks
sys.dm_os_memory_nodes
sys.dm_os_nodes
sys.dm_os_performance_counters
sys.dm_os_process_memory
sys.dm_os_schedulers
sys.dm_os_server_diagnostics_log_configurations
sys.dm_os_spinlock_stats
sys.dm_os_stacks
sys.dm_os_sys_info
sys.dm_os_sys_memory
sys.dm_os_tasks
sys.dm_os_threads
sys.dm_os_virtual_address_dump
sys.dm_os_volume_stats
sys.dm_os_waiting_tasks
sys.dm_os_wait_stats
sys.dm_os_windows_info
sys.dm_os_workers
The following SQL Server Operating System-related dynamic management views are Identified for informational purposes only. Not supported. Future compatibility is not guaranteed..
sys.dm_os_function_symbolic_name
sys.dm_os_ring_buffers
sys.dm_os_memory_allocations
sys.dm_os_sublatches
sys.dm_os_worker_local_storage
See Also
-->Applies to: SQL Server (all supported versions) Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Parallel Data Warehouse
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Returns a row per performance counter maintained by the server. For information about each performance counter, see Use SQL Server Objects.
Note
To call this from Azure Synapse Analytics or Parallel Data Warehouse, use the name sys.dm_pdw_nodes_os_performance_counters. This syntax is not supported by serverless SQL pool in Azure Synapse Analytics.
| Column name | Data type | Description |
|---|---|---|
| object_name | nchar(128) | Category to which this counter belongs. |
| counter_name | nchar(128) | Name of the counter. To get more information about a counter, this is the name of the topic to select from the list of counters in Use SQL Server Objects. |
| instance_name | nchar(128) | Name of the specific instance of the counter. Often contains the database name. |
| cntr_value | bigint | Current value of the counter. Note: For per-second counters, this value is cumulative. The rate value must be calculated by sampling the value at discrete time intervals. The difference between any two successive sample values is equal to the rate for the time interval used. |
| cntr_type | int | Type of counter as defined by the Windows performance architecture. See WMI Performance Counter Types on Docs or your Windows Server documentation for more information on performance counter types. |
| pdw_node_id | int | Applies to: Azure Synapse Analytics, Parallel Data Warehouse The identifier for the node that this distribution is on. |
Remarks
If the installation instance of SQL Server fails to display the performance counters of the Windows operating system, use the following Transact-SQL query to confirm that performance counters have been disabled.
If the return value is 0 rows, this means that the performance counters have been disabled. You should then look at the setup log and search for error 3409, Reinstall sqlctr.ini for this instance, and ensure that the instance login account has correct registry permissions.This denotes that performance counters were not enabled. The errors immediately before the 3409 error should indicate the root cause for the failure of performance counter enabling. For more information about setup log files, see View and Read SQL Server Setup Log Files.
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Performance counters where the cntr_type column value is 65792 display a snapshot of the last observed value only, not an average.
Performance counters where the cntr_type column value is 272696320 or 272696576 display the average number of operations completed during each second of the sample interval. Counters of this type measure time in ticks of the system clock. For example, to get a snapshot-like reading of the last second only for the Buffer Manager:Lazy writes/sec and Buffer Manager:Checkpoint pages/sec counters, you must compare the delta between two collection points that are one second apart.
Performance counters where the cntr_type column value is 537003264 display the ratio of a subset to its set as a percentage. For example, the Buffer Manager:Buffer cache hit ratio counter compares the total number of cache hits and the total number of cache lookups. As such, to get a snapshot-like reading of the last second only, you must compare the delta between the current value and the base value (denominator) between two collection points that are one second apart. The corresponding base value is the performance counter Buffer Manager:Buffer cache hit ratio base where the cntr_type column value is 1073939712.
Performance counters where the cntr_type column value is 1073874176 display how many items are processed on average, as a ratio of the items processed to the number of operations. For example, the Locks:Average Wait Time (ms) counters compares the lock waits per second with the lock requests per second, to display the average amount of wait time (in milliseconds) for each lock request that resulted in a wait. As such, to get a snapshot-like reading of the last second only, you must compare the delta between the current value and the base value (denominator) between two collection points that are one second apart. The corresponding base value is the performance counter Locks:Average Wait Time Base where the cntr_type column value is 1073939712.
Data in the sys.dm_os_performance_counters DMV is not persisted after the database engine restarts. Use the sqlserver_start_time column in sys.dm_os_sys_info to find the last database engine startup time.
Permission
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On SQL Server and SQL Managed Instance, requires VIEW SERVER STATE permission.
On SQL Database Basic, S0, and S1 service objectives, and for databases in elastic pools, the server admin account or the Azure Active Directory admin account is required. On all other SQL Database service objectives, the VIEW DATABASE STATE permission is required in the database.
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Examples
The following example returns all performance counters that display snapshot counter values.
See Also
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SQL Server Operating System Related Dynamic Management Views (Transact-SQL)
sys.sysperfinfo (Transact-SQL)
sys.dm_os_sys_info (Transact-SQL)