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SQL Server Database Mirroring Best Practices

Antonios Chatzipavlis

Επειδή στο προηγούμενο μου post σχετικά με το Database Mirroring στον SQL Server ξέχασα να βάλω κάποια Best Practices που έχω διαβάσει σε διάφορα paper, blogs και βιβλία βάζω τα παρακάτω που προτείνει και ο Brad McGehee  μιας και με βρήσκουν 100% σύμφωνο.

  1. The principal database and the mirror database should be on separate physical hardware, and ideally, in different physical locations.

  2. The witness server should be on separate physical hardware, and be on a separate network (best if at a third location).

  3. Initial database mirroring setup should be done during less busy times, as the setup process can negatively affect performance of the production database being mirrored.

  4. Use high availability mode whenever possible, and high performance mode only when required.

  5. The hardware, along with the OS and SQL Server configuration, should be identical (at least very similar) between the two servers.

  6. While a fast connection is not required between mirrored servers, the faster the connection, and the better quality the connection, the better.

  7. You will want to optimize the performance of the mirrored database as much as possible to reduce the overhead caused by the mirroring process itself.

  8. Thoroughly test database mirroring before putting it into production.

  9. Monitor database mirroring daily to ensure that it is working properly, and is meeting performance goals.

  10. Develop a formal operational and recovery procedure (and document) to support mirroring. Periodically test the failover process to ensure that it works.


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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