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Πώς θα βρω τα queries που κάνουν υψηλή χρήση της CPU;

Antonios Chatzipavlis

Sunday 28 June 2009

Λοιπόν μιας και απέκτησα και εδω ένα blog είπα να κάνω σεφτέ με κάτι που λίγο ή πολύ όσοι ασχολούμαστε με SQL Server αντιμετωπίζουμε.

Πως θα βρω τα queries που κάνουν υψηλή χρήση της CPU;

H απάντηση στο ερώτημα αυτό είναι η παρακάτω custom stored procedure η οποία δουλεύει σε SQL Server 2005 & 2008

SQL Script

create procedure spFindQueriesThatUseHighCPU 
as 
    Set NOCOUNT ON 

    SELECT TOP 100 
            (a.total_worker_time/a.execution_count) as [Avg_CPU_Time], -- the time is in ms 
            Convert(Varchar,Last_Execution_Time) as 'Last_execution_Time', 
            Total_Physical_Reads, 
            SUBSTRING(b.text,a.statement_start_offset/2, 
            (case 
                when a.statement_end_offset = -1 then len(convert(nvarchar(max), b.text)) * 2 
                else 
                a.statement_end_offset end - a.statement_start_offset)/2) as Query_Text, 
            dbname=Upper(db_name(b.dbid)), 
            b.objectid as 'Object_ID' 
    FROM sys.dm_exec_query_stats a 
        cross apply sys.dm_exec_sql_text(a.sql_handle) as b 
    ORDER BY [Avg_CPU_Time] DESC 
go

Antonios Chatzipavlis

Antonios is a Data Solutions Consultant and Trainer. He has been working in IT since 1988. In his career, he has worked as senior developer, IT Manager, Solutions Architect and IT Consultant. Since 1995 he has been devoted on new technologies and software development tools, mainly by Microsoft, either by training company staff and colleagues or assisting them in design, development and implementation as a consultant or chief developer. He has focused in Databases and Data Science since 1995. He specialized in Microsoft SQL Server since version 6.0 in areas like SQL Server Internals, Database Design and Development, Business Intelligence and in 2010 he has started working with Azure Data Platform, NoSQL databases, Big Data Technologies and Machine Learning. He is an active member of many IT communities in Greece, answering colleagues' questions and writing articles in his web site. He is the owner of SQLschool.gr which is a community portal with a lot of information about Microsoft SQL Server. He has been a Microsoft Certified Trainer (MCT) since 2000. Microsoft honored him as MVP on Data Platform due to his activities in SQL Server since 2010. He holds a large number of Microsoft Certifications and Microsoft SQL Server Certifications since version 6.5.