sys.dm_db_resource_stats (Azure SQL Database)

THIS TOPIC APPLIES TO: noSQL Server yesAzure SQL DatabasenoAzure SQL Data Warehouse noParallel Data Warehouse

Returns CPU, I/O, and memory consumption for an Azure SQL Database database. One row exists for every 15 seconds, even if there is no activity in the database. Historical data is maintained for one hour.

Columns Data Type Description
end_time datetime UTC time indicates the end of the current reporting interval.
avg_cpu_percent decimal (5,2) Average compute utilization in percentage of the limit of the service tier.
avg_data_io_percent decimal (5,2) Average data I/O utilization in percentage of the limit of the service tier.
avg_log_write_percent decimal (5,2) Average write resource utilization in percentage of the limit of the service tier.
avg_memory_usage_percent decimal (5,2) Average memory utilization in percentage of the limit of the service tier.

This includes memory used for storage of In-Memory OLTP objects.
xtp_storage_percent decimal (5,2) Storage utilization for In-Memory OLTP in percentage of the limit of the service tier (at the end of the reporting interval). This includes memory used for storage of the following In-Memory OLTP objects: memory-optimized tables, indexes, and table variables. It also includes memory used for processing ALTER TABLE operations.

Returns 0 if In-Memory OLTP is not used in the database.
max_worker_percent decimal (5,2) Maximum concurrent workers (requests) in percentage of the limit of the database’s service tier.
max_session_percent decimal (5,2) Maximum concurrent sessions in percentage of the limit of the database’s service tier.
dtu_limit int Current max database DTU setting for this database during this interval. For databases using the vCore-based model, this column is NULL.
cpu_limit decimal (5,2) Number of vCores for this database during this interval. For databases using the DTU-based model, this column is NULL.

Tip

For more context about these limits and service tiers, see the topics Service Tiers and Service tier capabilities and limits.

Permissions

This view requires VIEW DATABASE STATE permission.

Remarks

The data returned by sys.dm_db_resource_stats is expressed as a percentage of the maximum allowed limits for the service tier/performance level that you are running.

If the database was failed over to another server within the last 60 minutes, the view will only return data for the time it has been the primary database since that failover.

For a less granular view of this data, use sys.resource_stats catalog view in the master database. This view captures data every 5 minutes and maintains historical data for 14 days. For more information, see sys.resource_stats (Azure SQL Database).

When a database is a member of an elastic pool, resource statistics presented as percent values, are expressed as the percent of the max limit for the databases as set in the elastic pool configuration.

Example

The following example returns resource utilization data ordered by the most recent time for the currently connected database.

SELECT * FROM sys.dm_db_resource_stats ORDER BY end_time DESC;  

The following example identifies the average DTU consumption in terms of a percentage of the maximum allowed DTU limit in the performance level for the user database over the past hour. Consider increasing the performance level as these percentages near 100% on a consistent basis.

SELECT end_time,   
  (SELECT Max(v)    
   FROM (VALUES (avg_cpu_percent), (avg_data_io_percent), (avg_log_write_percent)) AS    
   value(v)) AS [avg_DTU_percent]   
FROM sys.dm_db_resource_stats;  

The following example returns the average and maximum values for CPU percent, data and log I/O, and memory consumption over the last hour.

SELECT    
    AVG(avg_cpu_percent) AS 'Average CPU Utilization In Percent',   
    MAX(avg_cpu_percent) AS 'Maximum CPU Utilization In Percent',   
    AVG(avg_data_io_percent) AS 'Average Data IO In Percent',   
    MAX(avg_data_io_percent) AS 'Maximum Data IO In Percent',   
    AVG(avg_log_write_percent) AS 'Average Log Write Utilization In Percent',   
    MAX(avg_log_write_percent) AS 'Maximum Log Write Utilization In Percent',   
    AVG(avg_memory_usage_percent) AS 'Average Memory Usage In Percent',   
    MAX(avg_memory_usage_percent) AS 'Maximum Memory Usage In Percent'   
FROM sys.dm_db_resource_stats;  

See Also

sys.resource_stats (Azure SQL Database)
Service Tiers
Service tier capabilities and limits