Nik and Michael discuss hot_standby_feedback — what it controls, whether and when read replicas should be changed to on, and other settings you can change to help too.

Here are some links to things they mentioned:

• hot_standby_feedback https://www.postgresql.org/docs/current/runtime-config-replication.html#GUC-HOT-STANDBY-FEEDBACK
• hot_standby_feedback: experiments on PostgreSQL 17 (by Nik) https://console.postgres.ai/shared/brief/6018f69d-8975-48e3-8259-a72c77105572
• Best practices for Amazon RDS PostgreSQL replication (blog post) https://aws.amazon.com/blogs/database/best-practices-for-amazon-rds-postgresql-replication/
• log_autovacuum_min_duration https://www.postgresql.org/docs/current/runtime-config-logging.html#GUC-LOG-AUTOVACUUM-MIN-DURATION
• max_standby_streaming_delay https://www.postgresql.org/docs/current/runtime-config-replication.html#GUC-MAX-STANDBY-STREAMING-DELAY
• WAIT FOR LSN https://www.postgresql.org/docs/19/sql-wait-for.html
• transaction_timeout https://www.postgresql.org/docs/current/runtime-config-client.html#GUC-TRANSACTION-TIMEOUT
• Hot Standby Feedback should default to on in 9.3+ https://www.postgresql.org/message-id/flat/20121130190227.GJ3957%40awork2.anarazel.de

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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!

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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