我想测量特定数据库的当前CPU使用率,我编写了以下查询以获取此信息。但是,我不确定此查询的准确性。
DECLARE @Fm INT;
DECLARE @FTime DATETIME;
SELECT @FTime = getdate(),@Fm = SUM(dmqs.total_worker_time)
FROM sys.dm_exec_query_stats dmqs
CROSS APPLY
(SELECT
CONVERT(INT, value) AS [DatabaseID]
FROM sys.dm_exec_plan_attributes(dmqs.plan_handle)
WHERE attribute = N'dbid') dmpa
where DatabaseID=7
GROUP BY dmpa.DatabaseID
WAITFOR DELAY '00:00:01'
SELECT CAST((SUM(dmqs.total_worker_time) - @Fm)* 1.0 / SUM(dmqs.total_worker_time) * 100 AS DECIMAL(5, 2))
FROM sys.dm_exec_query_stats dmqs
CROSS APPLY
(SELECT
CONVERT(INT, value) AS [DatabaseID]
FROM sys.dm_exec_plan_attributes(dmqs.plan_handle)
WHERE attribute = N'dbid') dmpa
where DatabaseID=7
GROUP BY dmpa.DatabaseID
[查看Glen Berry的诊断查询。他有一些与CPU相关的信息,包括实例中每个数据库的CPU使用率细分。https://www.sqlskills.com/blogs/glenn/category/dmv-queries/