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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

Filesystem crash recovery

Filesystem writes have two major components to them. At the bottom level, you are writing out blocks of data to the disk. In addition, there is some amount of filesystem metadata involved too. Examples of metadata include the directory tree, the list of blocks and attributes associated with each file, and the list of what blocks on disk are free.

Like many disk-oriented activities, filesystems have a very clear performance versus reliability trade-off they need to make. The usual reliability concern is what happens in the situation where you're writing changes to a file and the power goes out in the middle.

Consider the case where you're writing out a new block to a file, one that makes the file bigger (rather than overwriting an existing block). You might do that in the following order:

  1. Write data block
  2. Write file metadata referencing use...
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