Postgres FM

synchronous_commit


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Nikolay and Michael discuss synchronous_commit — what it means on single node setups, for synchronous replication setups, and the pros and cons of the different options for each.
 
Here are some links to things they mentioned:

  • synchronous_commit https://www.postgresql.org/docs/current/runtime-config-wal.html#GUC-SYNCHRONOUS-COMMIT
  • synchronous_commit history on pgPedia https://pgpedia.info/s/synchronous_commit.html
  • Patroni’s maximum_lag_on_failover setting https://patroni.readthedocs.io/en/master/replication_modes.html#asynchronous-mode-durability
  • wal_writer_delay https://www.postgresql.org/docs/current/runtime-config-wal.html#GUC-WAL-WRITER-DELAY
  • Selective asynchronous commits in PostgreSQL - balancing durability and performance (blog post by Shayon Mukherjee) https://www.shayon.dev/post/2025/75/selective-asynchronous-commits-in-postgresql-balancing-durability-and-performance/
  • Asynchronous Commit https://www.postgresql.org/docs/current/wal-async-commit.html
  • synchronous_standby_names https://www.postgresql.org/docs/current/runtime-config-replication.html#GUC-SYNCHRONOUS-STANDBY-NAMES
  • Jepson article about Amazon RDS multi-AZ clusters (by Kyle Kingsbury, aka "Aphyr”) https://jepsen.io/analyses/amazon-rds-for-postgresql-17.4


~~~

What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc!


~~~

Postgres FM is produced by:

  • Michael Christofides, founder of pgMustard
  • Nikolay Samokhvalov, founder of Postgres.ai


With credit to:

  • Jessie Draws for the elephant artwork
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Postgres FMBy Nikolay Samokhvalov and Michael Christofides

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