-- *************************************************************************************************
-- Author j.roberts
-- Date 11 July 2024
-- Reports costs/statistics of SQL statements for given time on given database
-- *************************************************************************************************
GO
DECLARE @Database sysname = 'MyDb', -- Set the database name
@MonitorPeriod varchar(10) = '01:00:00' -- 1 hour -- set this to the time period you want to monitor for
BEGIN

SET NOCOUNT ON;
SET ARITHABORT OFF;
SET ANSI_WARNINGS OFF;
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;

DROP TABLE IF EXISTS #CombinedResults;

CREATE TABLE #CombinedResults
(
DBName sysname,
QueryText varchar(MAX),
Execution_count bigint,
total_cpu_time bigint,
total_IO bigint,
total_physical_reads bigint,
total_logical_reads bigint,
total_logical_writes bigint,
total_elapsed_time bigint,
Identifier tinyint
,plan_handle varbinary(64) not null
,last_execution_time datetime
);

DECLARE @Iteration tinyint = 1;
WHILE @Iteration <= 2 BEGIN ;WITH PlanStats AS ( SELECT st.dbid, st.text AS QueryText, cp.plan_handle, MAX(cp.usecounts) AS Execution_count, SUM(qs.total_worker_time) AS total_cpu_time, SUM(qs.total_physical_reads + qs.total_logical_reads + qs.total_logical_writes) AS total_IO, SUM(qs.total_physical_reads) AS total_physical_reads, SUM(qs.total_logical_reads) AS total_logical_reads, SUM(qs.total_logical_writes) AS total_logical_writes, SUM(qs.total_elapsed_time) AS total_elapsed_time, MAX(qs.last_execution_time) AS last_execution_time FROM sys.dm_exec_cached_plans cp INNER JOIN sys.dm_exec_query_stats qs ON cp.plan_handle = qs.plan_handle CROSS APPLY sys.dm_exec_sql_text(cp.plan_handle) st WHERE DB_NAME(st.dbid) IS NOT NULL AND DB_NAME(st.dbid) LIKE @Database GROUP BY st.dbid, st.text, cp.plan_handle ) INSERT INTO #CombinedResults SELECT DB_NAME(ps.dbid) AS DBName, ps.QueryText, SUM(ps.Execution_count) AS Execution_count, SUM(ps.total_cpu_time) AS total_cpu_time, SUM(ps.total_IO) AS total_IO, SUM(ps.total_physical_reads) AS total_physical_reads, SUM(ps.total_logical_reads) AS total_logical_reads, SUM(ps.total_logical_writes) AS total_logical_writes, SUM(ps.total_elapsed_time) AS total_elapsed_time, @Iteration AS Identifier ,ps.plan_handle ,max(ps.last_execution_time) FROM PlanStats ps GROUP BY ps.dbid, ps.QueryText, plan_handle; -- Wait for the specified monitoring period during the first iteration IF @Iteration = 1 BEGIN WAITFOR DELAY @MonitorPeriod; END SET @Iteration = @Iteration + 1; END -- ************************************************************************************************ -- Results -- ************************************************************************************************ SELECT ISNULL(A.DBName, B.DBName) AS DBName, ISNULL(A.QueryText, B.QueryText) AS QueryText, ISNULL(A.Execution_count, 0) - ISNULL(B.Execution_count, 0) AS Execution_count, ISNULL(A.total_cpu_time, 0) - ISNULL(B.total_cpu_time, 0) AS total_cpu_time, (ISNULL(A.total_cpu_time,0) - ISNULL(B.total_cpu_time, 0)) / NULLIF(ISNULL(A.Execution_count,0) - ISNULL(B.Execution_count, 0), 0) AS avg_cpu_time, ISNULL(A.total_IO, 0) - ISNULL(B.total_IO, 0) AS total_IO, (ISNULL(A.total_IO,0) - ISNULL(B.total_IO, 0)) / NULLIF(ISNULL(A.execution_count,0) - ISNULL(B.execution_count, 0), 0) AS avg_total_IO, ISNULL(A.total_physical_reads, 0) - ISNULL(B.total_physical_reads, 0) AS total_physical_reads, (ISNULL(A.total_physical_reads,0) - ISNULL(B.total_physical_reads, 0)) / NULLIF(ISNULL(A.execution_count,0) - ISNULL(B.execution_count, 0), 0) AS avg_physical_read, ISNULL(A.total_logical_reads, 0) - ISNULL(B.total_logical_reads, 0) AS total_logical_reads, (ISNULL(A.total_logical_reads, 0) - ISNULL(B.total_logical_reads, 0)) / NULLIF(ISNULL(A.execution_count,0) - ISNULL(B.execution_count, 0), 0) AS avg_logical_read, ISNULL(A.total_logical_writes, 0) - ISNULL(B.total_logical_writes, 0) AS total_logical_writes, (ISNULL(A.total_logical_writes, 0) - ISNULL(B.total_logical_writes, 0)) / NULLIF(ISNULL(A.execution_count,0) - ISNULL(B.execution_count, 0), 0) AS avg_logical_writes, ISNULL(A.total_elapsed_time, 0) - ISNULL(B.total_elapsed_time, 0) AS total_elapsed_time, (ISNULL(A.total_elapsed_time, 0) - ISNULL(B.total_elapsed_time, 0)) / NULLIF(ISNULL(A.execution_count, 0) - ISNULL(B.execution_count, 0), 0) AS avg_elapsed_time, ISNULL(A.last_execution_time, A.last_execution_time) last_execution_time FROM (SELECT * FROM #CombinedResults WHERE Identifier = 2) A LEFT JOIN (SELECT * FROM #CombinedResults WHERE Identifier = 1) B ON A.DBName = B.DBName AND A.QueryText = B.QueryText AND A.plan_handle = B.plan_handle WHERE ISNULL(A.Execution_count, 0) - ISNULL(B.Execution_count, 0) <> 0
ORDER BY 4 DESC;

DROP TABLE #CombinedResults;
END
GO