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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

Summary

Choosing what indexes to add to your tables remains one of those areas where creative tuning work can still trump mechanical attempts to measure and react. There are some index tuning wizards available for other databases, but even the best of them just provide suggestions instead of dependable advice. It's important to be systematic about your indexes though. Because adding an index increases overhead every time you add or change rows in a table, each index needs to satisfy enough queries to justify how much it costs to maintain. There is more information about determining whether the indexes on your system are working effectively in Chapter 11, Database Activity and Statistics.

Measure actual block reads to determine whether an index is truly effective. Queries cannot be answered using only the data in an index. The data blocks must be consulted for row visibility...

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