Logical replication common issues

Postgres FM

Nikolay and Michael are joined by Sai Srirampur, CEO and Co-founder of PeerDB, to discuss how to overcome several logical replication issues. They discuss the protocol versions, minimising slot growth, minimising lag, and some tips and tricks for scaling things well.
Here are some links to things they mentioned:

• PeerDB https://www.peerdb.io/
• Our episode on logical replication https://postgres.fm/episodes/logical-replication
• Exploring versions of the Postgres logical replication protocol (blog post by Sai) https://blog.peerdb.io/exploring-versions-of-the-postgres-logical-replication-protocol
• Logical Streaming Replication Protocol https://www.postgresql.org/docs/current/protocol-logical-replication.html
• REPLICA IDENTITY FULL https://www.postgresql.org/docs/current/sql-altertable.html#SQL-ALTERTABLE-REPLICA-IDENTITY
• On the performance impact of REPLICA IDENTITY FULL in Postgres (blog post by Xata) https://xata.io/blog/replica-identity-full-performance
• max_slot_wal_keep_size https://www.postgresql.org/docs/current/runtime-config-replication.html#GUC-MAX-SLOT-WAL-KEEP-SIZE
• Active Active in Postgres 16 (blog post by Crunchy Data) https://www.crunchydata.com/blog/active-active-postgres-16
• pgEdge https://www.pgedge.com/
• DistSQL (term used by Mark Callaghan) https://smalldatum.blogspot.com/2023/07/keeping-up-with-sql-dbms-market.html
• Five tips on Postgres logical decoding (blog post by Sai) https://blog.peerdb.io/five-tips-on-postgres-logical-decoding
• PG Slot Notify: Monitor Postgres Slot Growth in Slack (blog post by PeerDB) https://blog.peerdb.io/pg-slot-notify-monitor-postgres-slot-growth-in-slack

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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 brought to you by:

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

With special thanks to:

• Jessie Draws for the elephant artwork