PostgreSQL's fsync Durability Guarantees: A 20-Year Oversight
fsyncgate•May 31, 2026

PostgreSQL's fsync Durability Guarantees: A 20-Year Oversight

For 20 years, PostgreSQL's fsync guarantees have been a topic of debate. A software engineer takes a closer look at the OS-level durability and the infamous 'fsyncgate' bug.

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Key summary

A software engineer's exploration of OS-level durability and the PostgreSQL 'fsyncgate' bug, which highlights a 20-year oversight in the database's fsync guarantees.

TL;DR

  • PostgreSQL's fsync guarantees have been a topic of debate for 20 years.
  • The 'fsyncgate' bug highlights a critical issue with database durability.
  • OS-level durability is crucial for database reliability.
  • Write-ahead logs are used in databases to ensure data integrity.
  • PostgreSQL's performance is affected by its fsync guarantees.
  • The 'fsyncgate' bug has significant implications for database reliability.

This content is automatically summarized using AI. For full context, always refer to the original article.

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