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Tip of the Day: AWE in 64 bit systems

Antonios Chatzipavlis

Στον SQL Server υπάρχει το option AWE (μπορεί κανείς να το αλλάξει είτε με δεξί κλικ στον όνομα του server μέσα από το SSMS Properties\Memory είτε με την χρήση της sp_configure).

Στην περίπτωση που είστε σε 64-bit system ακόμα και αν την ενεργοποιήσετε αυτή δεν λαβανετε υποψη, εκτός αν  δώσετε στο SQL Server service account το Lock Pages in Memory privilage και είστε σε Enterprise Edition.

Στην αρχή ήταν μόνο για Enterprise Editon αλλά μετά από feedback Που δώθηκε στην Microsoft στον 2008 με την χρήση του SQL Server 2008 SP1 + Commulative Update 2 και την χρήση trace flag αυτό μπορεί να παίξει και στην Standard Edition. Περισσότερα εδώ

Εάν όλα τα παραπάνω έχουν γίνει τότε στο SQL Server Error Log θα δείτε να γράφει:

Using Locked Pages for Buffer Pool

ΠΡΟΣΟΧΗ : Αυτό δεν πρέπει να χρησιμοποιείται σαν best practice σε όλους τους SQL Servers που έχουμε είναι workaround και αλλάζει μόνο εφόσον συντρέχουν οι λόγοι για να αλλάξουμε την συμπεριφορά των 64-bit


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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