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Tip of the Day: Monitoring buffer cache size

Antonios Chatzipavlis

Για να κάνω monitoring το μέγεθος της buffer cache αρκεί μέσα από το Performance Monitor Tool των Windows να ορίσω τους μετρητές:

SQLServer: Memory Manager \ Total Server Memory (KB)

Δείχνει το τρέχων μέγεθος της buffer cache.

SQLServer: Memory Manager \ Target Server Memory (KB)

Δείχνει το πάνω όριο της μνήμης που έχει εκείνη την στιγμή έχει ορίσει ο SQL Server ότι μπορεί να χρησιμοποιήσει για την buffer cache. Το νούμερο αυτό μπορεί να αλλάξει δυναμικά και αυτό γίνεται στις περιπτώσεις που ο SQL Server διαπιστώσει

  • ότι το σύστημα είναι σε memory pressure (μειώνει την μνήμη)
  • ότι το σύστημα δεν είναι σε memory pressure (αυξάνει την μνήμη αλλα δεν θα γίνει μεγαλύτερη από ότι έχω ορίσει στην Max Memory)

Προσοχή.  Σε καμία περίπτωση αυτοί οι μετρητές δεν δείχνουν την συνολική μνήμη του SQL Server, αλλά μόνο  την μνήμη που αφορά την buffer cache.

SQLServer: Buffer Manager \ Page Life Expectancy

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Antonios Chatzipavlis

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.


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