--- title: Where Does My INSERT Go? A Logical Replication Story |... description: A detailed walkthrough of how a PostgreSQL INSERT travels from publisher to subscriber via logical replication. Covers all 9 stops: heap tuple creation, shared... canonical: https://daily.dev/posts/where-does-my-insert-go-a-logical-replication-story-posette-an-event-for-postgres-2026-salrbyv9y twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Where Does My INSERT Go? A Logical Replication Story | POSETTE: An Event for Postgres 2026 | daily.dev og:description: A detailed walkthrough of how a PostgreSQL INSERT travels from publisher to subscriber via logical replication. Covers all 9 stops: heap tuple creation, shared... og:url: https://daily.dev/posts/where-does-my-insert-go-a-logical-replication-story-posette-an-event-for-postgres-2026-salrbyv9y og:image: https://api.daily.dev/og/posts/SalrbyV9Y.png og:image:alt: Where Does My INSERT Go? A Logical Replication Story | POSETTE: An Event for Postgres 2026 og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Where Does My INSERT Go? A Logical Replication Story | POSETTE: An Event for Postgres 2026 **[Microsoft Developer](https://daily.dev/sources/microsoftdeveloper)** · 27 min read · 0 upvotes · 0 comments ## Summary A detailed walkthrough of how a PostgreSQL INSERT travels from publisher to subscriber via logical replication. Covers all 9 stops: heap tuple creation, shared buffer, WAL record construction, WAL levels (replica vs logical), WAL sender, logical decoding, ReorderBuffer (which reassembles interleaved transactions by XID), replication slots, output plugins (pgoutput, test_decoding, wal2json), and the subscriber apply process. Key internals explained include xmin/xmax, full-page image writes, LSN ordering, subtransaction handling, and the trade-offs of large transactions with work_mem. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#postgresql](https://daily.dev/tags/postgresql) [View this post on daily.dev](https://daily.dev/posts/where-does-my-insert-go-a-logical-replication-story-posette-an-event-for-postgres-2026-salrbyv9y) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Where Does My INSERT Go? 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