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How often I have to do rebuild or reorganize indexes in my database?

Antonios Chatzipavlis
Monday 06 October 2014

Ένα ερώτημα που με ρωτάνε συνέχεια όλοι. Μάλιστα στο πρώτο SQL Saturday που έγινε στην Ελλάδα το Σάββατο 4/10/2014 η συγκεκριμένη ερώτηση είχε μεγάλο σουξέ.

Για αυτό λοιπόν θα την απαντήσω και γραπτώς ώστε να είναι εύκολα αναγνώσιμη από όλους σας.

Όπως είναι γνωστό βασικός παράγοντας είναι τo ποσοστό του fragmentation.
Μπορείτε να βρείτε εύκολα αυτό με τα queries που έχω δώσει στο post αυτό.

Με βάση τα δεδομένα από τα queries αυτά οι οδηγίες που δίνω πάντα είναι οι εξής

  • Δεν ασχολούμαστε με indexes που έχουν κάτω από 1000 index pages, ότι ποσοστό fragmentation και αν έχουν
  • Δεν ασχολούμαστε με indexes που έχουν fragmentation μικρότερο ή ίσο από 5%.
  • Κάνουμε reorganize index αυτούς που έχουν fragmentation μεγαλύτερο από 5% και μικρότερο από 30%
  • Κάνουμε rebuild index αυτούς που έχουν fragmentation μεγαλύτερο από 30%.

Με αυτές τις οδηγίες πρέπει να πορευτείται και να φτιάξετε τα index maintenance plans σας


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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