Question 136 - DP-300 discussion

Box 1: sys.resource_stats

sys.resource_stats returns CPU usage and storage data for an Azure SQL Database. It has database_name and start_time columns.

Box 2: DateAdd

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

Incorrect Answers:

sys.dm_exec_requests:

sys.dm_exec_requests returns information about each request that is executing in SQL Server. It does not have a column named database_name.

sys.dm_db_resource_stats:

sys.dm_db_resource_stats does not have any start_time column.

Note: sys.dm_db_resource_stats 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 approximately one hour.

Sys.dm_user_db_resource_governance returns actual configuration and capacity settings used by resource governance mechanisms in the current database or elastic pool. It does not have any start_time column.

Reference:

https://docs.microsoft.com/en-us/sql/relational-databases/system-catalog-views/sys-resource-stats-azure-sql-database