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PostgreSQL 10 High Performance

You're reading from   PostgreSQL 10 High Performance Expert techniques for query optimization, high availability, and efficient database maintenance

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Product type Paperback
Published in Apr 2018
Publisher Packt
ISBN-13 9781788474481
Length 508 pages
Edition 3rd Edition
Languages
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Author (1):
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Enrico Pirozzi Enrico Pirozzi
Author Profile Icon Enrico Pirozzi
Enrico Pirozzi
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Table of Contents (18) Chapters Close

Preface 1. PostgreSQL Versions FREE CHAPTER 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

Buffer, background writer, and checkpoint activity

Monitoring gross activity in the database buffer cache was very difficult until PostgreSQL 8.3, where the pg_stat_bgwriter view was introduced. This allows tracking the general flow of every data page buffer that goes into or out of the cache, along with statistics about the related checkpoint process responsible for much of that. Some questions you can answer with this data include the following:

  • What percentage of the time are checkpoints being requested based on activity instead of time passing?
  • How much data does the average checkpoint write?
  • What percentage of the data being written out happens from checkpoints and backends, respectively?

It's possible to compute these numbers easily enough right from the view. The only additional piece needed is the block size needed to hold a single buffer, available as one of the...

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