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PostgreSQL 10 High Performance - Third Edition

You're reading from  PostgreSQL 10 High Performance - Third Edition

Product type Book
Published in Apr 2018
Publisher Packt
ISBN-13 9781788474481
Pages 508 pages
Edition 3rd Edition
Languages
Author (1):
Enrico Pirozzi Enrico Pirozzi
Profile icon Enrico Pirozzi
Toc

Table of Contents (18) Chapters close

Preface 1. PostgreSQL Versions 2. Database Hardware 3. Database Hardware Benchmarking 4. Disk Setup 5. Memory for Database Caching 6. Server Configuration Tuning 7. Routine Maintenance 8. Database Benchmarking 9. Database Indexing 10. Query Optimization 11. Database Activity and Statistics 12. Monitoring and Trending 13. Pooling and Caching 14. Scaling with Replication 15. Partitioning Data 16. Avoiding Common Problems 17. Other Books You May Enjoy

Analyzing buffer cache contents

You've seen and been told how using a block will increase its usage count. You've also seen and been told how a dirty block might make its way out to disk. This wasn't intended just as an academic exercise. Believe it or not, all of this information is useful for determining how large your shared buffer cache should be!

If you want to do better than following a rule of thumb for how big to set shared_buffers relative to the OS cache, you have two options. You can run your own benchmarks with your application and see how the results vary, based on the amount of shared memory dedicated to the database. Just be careful to account for the influence of the larger OS cache when running multiple such tests, or you can use knowledge of how the buffer cache works from inside it to help make that decision.

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