sys.dm_resource_governor_resource_pools (Transact-SQL)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
Returns information about the current resource pool state, the current configuration of resource pools, and resource pool statistics.
Note
To call this from Azure Synapse Analytics or Analytics Platform System (PDW), use the name sys.dm_pdw_nodes_resource_governor_resource_pools. This syntax is not supported by serverless SQL pool in Azure Synapse Analytics.
| Column name | Data type | Description |
|---|---|---|
pool_id |
int | The ID of the resource pool. Not nullable. |
name |
sysname | The name of the resource pool. Not nullable. |
statistics_start_time |
datetime | The time when statistics was reset for this pool. Not nullable. |
total_cpu_usage_ms |
bigint | The cumulative CPU usage in milliseconds since the Resource Governor statistics were reset. Not nullable. |
cache_memory_kb |
bigint | The current total cache memory usage in kilobytes. Not nullable. |
compile_memory_kb |
bigint | The current total stolen memory usage in kilobytes (KB). Most this usage would be for compile and optimization, but it can also include other memory users. Not nullable. |
used_memgrant_kb |
bigint | The current total used (stolen) memory from memory grants. Not nullable. |
total_memgrant_count |
bigint | The cumulative count of memory grants in this resource pool. Not nullable. |
total_memgrant_timeout_count |
bigint | The cumulative count of memory grant time-outs in this resource pool. Not nullable. |
active_memgrant_count |
int | The current count of memory grants. Not nullable. |
active_memgrant_kb |
bigint | The sum, in kilobytes (KB), of current memory grants. Not nullable. |
memgrant_waiter_count |
int | The count of queries currently pending on memory grants. Not nullable. |
max_memory_kb |
bigint | The maximum amount of memory, in kilobytes, that the resource pool can have. This is based on the current settings and server state. Not nullable. |
used_memory_kb |
bigint | The amount of memory used, in kilobytes, for the resource pool. Not nullable. |
target_memory_kb |
bigint | The target amount of memory, in kilobytes, the resource pool is trying to attain. This is based on the current settings and server state. Not nullable. |
out_of_memory_count |
bigint | The number of failed memory allocations in the pool since the Resource Governor statistics were reset. Not nullable. |
min_cpu_percent |
int | The current configuration for the guaranteed average CPU bandwidth for all requests in the resource pool when there's CPU contention. Not nullable. |
max_cpu_percent |
int | The current configuration for the maximum average CPU bandwidth allowed for all requests in the resource pool when there's CPU contention. Not nullable. |
min_memory_percent |
int | The current configuration for the guaranteed amount of memory for all requests in the resource pool when there's memory contention. This isn't shared with other resource pools. Not nullable. |
max_memory_percent |
int | The current configuration for the percentage of total server memory that can be used by requests in this resource pool. Not nullable. |
cap_cpu_percent |
int | Hard cap on the CPU bandwidth that all requests in the resource pool receive. Limits the maximum CPU bandwidth level to the specified level. The allowed range for value is from 1 through 100. Not nullable. Applies to: SQL Server 2012 (11.x) and later versions |
min_iops_per_volume |
int | The minimum I/O per second (IOPS) per disk volume setting for this Pool. Nullable. NULL if the resource pool isn't governed for I/O. That is, the Resource Pool MIN_IOPS_PER_VOLUME and MAX_IOPS_PER_VOLUME settings are 0.Applies to: SQL Server 2014 (12.x) and later versions |
max_iops_per_volume |
int | The maximum I/O per second (IOPS) per disk volume setting for this Pool. Nullable. NULL if the resource pool isn't governed for I/O. That is, the Resource Pool MIN_IOPS_PER_VOLUME and MAX_IOPS_PER_VOLUME settings are 0.Applies to: SQL Server 2014 (12.x) and later versions |
read_io_queued_total |
int | The total read I/Os enqueued since the Resource Governor was reset. Nullable. NULL if the resource pool isn't governed for I/O. That is, the Resource Pool MIN_IOPS_PER_VOLUME and MAX_IOPS_PER_VOLUME settings are 0.Applies to: SQL Server 2014 (12.x) and later versions |
read_io_issued_total |
int | The total read I/Os issued since the Resource Governor statistics were reset. Nullable. NULL if the resource pool isn't governed for I/O. That is, the Resource Pool MIN_IOPS_PER_VOLUME and MAX_IOPS_PER_VOLUME settings are 0.Applies to: SQL Server 2014 (12.x) and later versions |
read_io_completed_total |
int | The total read I/Os completed since the Resource Governor statistics were reset. Not nullable. |
read_io_throttled_total |
int | The total read I/Os throttled since the Resource Governor statistics were reset. Nullable. NULL if the resource pool isn't governed for I/O. That is, the Resource Pool MIN_IOPS_PER_VOLUME and MAX_IOPS_PER_VOLUME settings are 0.Applies to: SQL Server 2014 (12.x) and later versions |
read_bytes_total |
bigint | The total number of bytes read since the Resource Governor statistics were reset. Not nullable. Applies to: SQL Server 2014 (12.x) and later versions |
read_io_stall_total_ms |
bigint | Total time (in milliseconds) between read I/O arrival and completion. Not nullable. Applies to: SQL Server 2014 (12.x) and later versions |
read_io_stall_queued_ms |
bigint | Total time (in milliseconds) between read I/O arrival and issue. Nullable. NULL if the resource pool isn't governed for I/O. That is, the Resource Pool MIN_IOPS_PER_VOLUME and MAX_IOPS_PER_VOLUME settings are 0.To determine if the I/O setting for the pool is causing latency, subtract read_io_stall_queued_ms from read_io_stall_total_ms. Applies to: SQL Server 2014 (12.x) and later versions |
write_io_queued_total |
int | The total write I/Os enqueued since the Resource Governor statistics were reset. Nullable. NULL if the resource pool isn't governed for I/O. That is, the Resource Pool MIN_IOPS_PER_VOLUME and MAX_IOPS_PER_VOLUME settings are 0.Applies to: SQL Server 2014 (12.x) and later versions |
write_io_issued_total |
int | The total write I/Os issued since the Resource Governor statistics were reset. Nullable. NULL if the resource pool isn't governed for I/O. That is, the Resource Pool MIN_IOPS_PER_VOLUME and MAX_IOPS_PER_VOLUME settings are 0.Applies to: SQL Server 2014 (12.x) and later versions |
write_io_completed_total |
int | The total write I/Os completed since the Resource Governor statistics were reset. Not nullable. Applies to: SQL Server 2014 (12.x) and later versions |
write_io_throttled_total |
int | The total write I/Os throttled since the Resource Governor statistics were reset. Not nullable. Applies to: SQL Server 2014 (12.x) and later versions |
write_bytes_total |
bigint | The total number of bytes written since the Resource Governor statistics were reset. Not nullable. Applies to: SQL Server 2014 (12.x) and later versions |
write_io_stall_total_ms |
bigint | Total time (in milliseconds) between write I/O arrival and completion. Not nullable. Applies to: SQL Server 2014 (12.x) and later versions |
write_io_stall_queued_ms |
bigint | Total time (in milliseconds) between write I/O arrival and issue. Nullable. NULL if the resource pool isn't governed for I/O. That is, the Resource Pool MIN_IOPS_PER_VOLUME and MAX_IOPS_PER_VOLUME settings are 0.This is the delay introduced by I/O Resource Governance. Applies to: SQL Server 2014 (12.x) and later versions |
io_issue_violations_total |
int | Total I/O issue violations. That is, the number of times when the rate of I/O issue was lower than the reserved rate. Nullable. NULL if the resource pool isn't governed for I/O. That is, the Resource Pool MIN_IOPS_PER_VOLUME and MAX_IOPS_PER_VOLUME settings are 0.Applies to: SQL Server 2014 (12.x) and later versions |
io_issue_delay_total_ms |
bigint | Total time (in milliseconds) between the scheduled issue and actual issue of I/O. Nullable. NULL if the resource pool isn't governed for I/O. That is, the Resource Pool MIN_IOPS_PER_VOLUME and MAX_IOPS_PER_VOLUME settings are 0.Applies to: SQL Server 2014 (12.x) and later versions |
io_issue_ahead_total_ms |
bigint | Internal use only. Applies to: SQL Server 2016 (13.x) and later versions |
reserved_io_limited_by_volume_total |
bigint | Internal use only. Applies to: SQL Server 2016 (13.x) and later versions |
io_issue_delay_non_throttled_total_ms |
bigint | Total time (in milliseconds) between the scheduled issue and actual issue of a non-throttled I/O. Applies to: SQL Server 2016 (13.x) and later versions |
total_cpu_delayed_ms |
bigint | Total time (in milliseconds) between a runnable worker yields, and the operating system gives back control to another runnable worker in the Database Engine. This could be the Idle worker. Applies to: SQL Server 2016 (13.x) and later versions |
total_cpu_active_ms |
bigint | Total active CPU time (in milliseconds). Applies to: SQL Server 2016 (13.x) and later versions |
total_cpu_violation_delay_ms |
bigint | Total CPU violation delays (in milliseconds). That is, total CPU time delay that was lower than the minimum guaranteed delay between a runnable worker yields, and the operating system gives back control to another runnable worker in the Database Engine. Applies to: SQL Server 2016 (13.x) and later versions |
total_cpu_violation_sec |
bigint | Total CPU violations (in seconds). That is, total time accrued when a CPU time violation was in-flight. Applies to: SQL Server 2016 (13.x) and later versions |
total_cpu_usage_preemptive_ms |
bigint | Total CPU time used while in preemptive mode scheduling for the workload group (in milliseconds). Not nullable. To execute code that is outside the Database Engine (for example, extended stored procedures and distributed queries), a thread has to execute outside the control of the non-preemptive scheduler. To do this, a worker switches to preemptive mode. Applies to: SQL Server 2016 (13.x) and later versions |
max_vcores |
decimal(5,2) | The current configuration for the maximum average CPU bandwidth allowed for all requests in the resource pool when there's CPU contention. Expressed in the unit of vCores and might not reflect the total number of vCores or logical CPUs available to a database, elastic pool, or SQL managed instance. Applies to: Azure SQL Database and Azure SQL Managed Instance |
total_cpu_usage_actual_ms |
bigint | Identified for informational purposes only. Not supported. Future compatibility is not guaranteed. |
pdw_node_id |
int` | The identifier for the node that this distribution is on. Applies to: Azure Synapse Analytics, Analytics Platform System (PDW) |
Remarks
Resource Governor workload groups and Resource Governor resource pools have a many-to-one mapping. As a result, many of the resource pool statistics are derived from the workload group statistics.
This dynamic management view shows the in-memory configuration. To see the stored configuration metadata, use the sys.resource_governor_resource_pools catalog view.
Permissions
Requires VIEW SERVER STATE permission.
Permissions for SQL Server 2022 and later
Requires VIEW SERVER PERFORMANCE STATE permission on the server.