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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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Toc

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

The amcheck module

Starting from PostgreSQL 10, the amcheck module is available. The amcheck module provides functions that allow you to verify the logical consistency of the structure of indexes. If the structure appears to be valid, no error is raised. You can find it at https://www.postgresql.org/docs/10/static/amcheck.html.

With this module, you can check the following:

  • Structural inconsistencies caused by incorrect operator class implementations
  • Corruption caused by hypothetical undiscovered bugs in the underlying
  • PostgreSQL access method code or sort code
  • Filesystem or storage subsystem faults where checksums happen to be simply not enabled
  • Corruption caused by faulty RAM, and the broader memory subsystem and operating system

Let's use it now:

pgbench=# create extension amcheck ; 
CREATE EXTENSION 
 
SELECT bt_index_check(c.oid), c.relname, c.relpages 
FROM pg_index...
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