sys.resource_stats (Azure SQL Database)

  • 2 minutes to read
  • Contributors
    • Carl Rabeler
    • Craig Guyer
    • Gene Milener
    • Steve Stein

APPLIES TO: noSQL Server yesAzure SQL Database noAzure SQL Data Warehouse noParallel Data Warehouse

Returns CPU usage and storage data for an Azure SQL Database. The data is collected and aggregated within five-minute intervals. For each user database, there is one row for every five-minute reporting window in which there is a change in resource consumption. The data returned includes CPU usage, storage size change, and database SKU modification. Idle databases with no changes may not have rows for every five-minute interval. Historical data is retained for approximately 14 days.

The sys.resource_stats view has different definitions depending on the version of the Azure SQL Database Server that the database is associated with. Consider these differences and any modifications your application requires when upgrading to a new server version.

The following table describes the columns available in a v12 server:

Columns Data Type Description
start_time datetime UTC time indicating the start of the five-minute reporting interval.
end_time datetime UTC time indicating the end of the five-minute reporting interval.
database_name varchar Name of the user database.
sku varchar Service Tier of the database. The following are the possible values:

Basic

Standard

Premium

General Purpose

Business Critical
storage_in_megabytes float Maximum storage size in megabytes for the time period, including database data, indexes, stored procedures, and metadata.
avg_cpu_percent numeric Average compute utilization in percentage of the limit of the service tier.
avg_data_io_percent numeric Average I/O utilization in percentage based on the limit of the service tier.
avg_log_write_percent numeric Average write resource utilization in percentage of the limit of the service tier.
max_worker_percent decimal(5,2) Maximum concurrent workers (requests) in percentage based on the limit of the database's service tier.

Maximum is currently calculated for the five-minute interval based on the 15-second samples of concurrent worker counts.
max_session_percent decimal(5,2) Maximum concurrent sessions in percentage based on the limit of the database's service tier.

Maximum is currently calculated for the five-minute interval based on the 15-second samples of concurrent session counts.
dtu_limit int Current max database DTU setting for this database during this interval.
allocated_storage_in_megabytes float The amount of formatted file space in MB made available for storing database data. Formatted file space is also referred to as data space allocated. For more information, see: File space management in SQL DB

Tip

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

Permissions

This view is available to all user roles with permissions to connect to the virtual master database.

Remarks

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

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.

For a more granular view of this data, use sys.dm_db_resource_stats dynamic management view in a user database. This view captures data every 15 seconds and maintains historical data for 1 hour. For more information, see sys.dm_db_resource_stats (Azure SQL Database).

Examples

The following example returns all databases that are averaging at least 80% of compute utilization over the last one week.

DECLARE @s datetime;  
DECLARE @e datetime;  
SET @s= DateAdd(d,-7,GetUTCDate());  
SET @e= GETUTCDATE();  
SELECT database_name, AVG(avg_cpu_percent) AS Average_Compute_Utilization   
FROM sys.resource_stats   
WHERE start_time BETWEEN @s AND @e  
GROUP BY database_name  
HAVING AVG(avg_cpu_percent) >= 80

See Also

Service Tiers
Service tier capabilities and limits