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Tip of the Day: sys.dm_os_buffer_descriptors

Antonios Chatzipavlis

Monday 09 May 2011

Η DMV αυτή δείχνει μια γράμμη για κάθε data page η οποία είναι στην buffer cache.

Με το παρακάτω script μπορείς να δεις το ποσό σε MB που έχει δεσμευτεί από τις σελίδες που υπάρχουν για κάθε βάση μέσα στην buffer cache

SELECT 
CASE database_id
WHEN 32767 THEN 'ResourceDB'
ELSE DB_NAME(database_id)
END AS 'Database',
COUNT(*)*8/1024 AS 'Cached Size (MB)'
FROM sys.dm_os_buffer_descriptors
GROUP BY DB_NAME(database_id),database_id
ORDER BY 2 DESC

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.