--- title: Postgres Support Case Recap | daily.dev description: Explains the Postgres 'remaining connection slots are reserved' error (SQLSTATE 53300), what causes it, and how to resolve it. Covers how Neon calculates... canonical: https://daily.dev/posts/postgres-support-case-recap-evuqjqhe8 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Postgres Support Case Recap | daily.dev og:description: Explains the Postgres 'remaining connection slots are reserved' error (SQLSTATE 53300), what causes it, and how to resolve it. Covers how Neon calculates... og:url: https://daily.dev/posts/postgres-support-case-recap-evuqjqhe8 og:image: https://api.daily.dev/og/posts/evuQJqHe8.png og:image:alt: Postgres Support Case Recap 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. # Postgres Support Case Recap **[Neon](https://daily.dev/sources/neontech)** · 5 min read · 0 upvotes · 0 comments ## Summary Explains the Postgres 'remaining connection slots are reserved' error (SQLSTATE 53300), what causes it, and how to resolve it. Covers how Neon calculates max_connections based on compute size and RAM, provides a reference table of connection limits per compute tier, and outlines three solutions: terminating idle connections, upgrading to a larger compute, or enabling PgBouncer-based connection pooling which supports up to 10,000 simultaneous connections. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [All Your GUCs in a Row: max\_connections](https://daily.dev/posts/all-your-gucs-in-a-row-max-connections-32g7lgls2) · Planet PostgreSQL · 0 upvotes · 0 comments - [Postgres Postmaster does not scale](https://daily.dev/posts/postgres-postmaster-does-not-scale-fee3cv3ni) · Hacker News · 45 upvotes · 1 comments - [PostgreSQL to SQL Field Notes: Connections](https://daily.dev/posts/postgresql-to-sql-field-notes-connections-qadiery02) · DevBlogs · 0 upvotes · 0 comments - [Connection Pool Sizing, Measured: Why 48 Connections Beat 400](https://daily.dev/posts/connection-pool-sizing-measured-why-48-connections-beat-400-f0oqizynp) · The Infinity · 62 upvotes · 5 comments - [How We Scaled Our Laravel \+ PostgreSQL Database with PgBouncer \(A Real-World Story\)](https://daily.dev/posts/how-we-scaled-our-laravel-postgresql-database-with-pgbouncer-a-real-world-story--se7axmtp7) · Medium · 3 upvotes · 0 comments --- Tags: [#postgresql](https://daily.dev/tags/postgresql) [View this post on daily.dev](https://daily.dev/posts/postgres-support-case-recap-evuqjqhe8) ```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":"Postgres Support Case Recap","url":"https://daily.dev/posts/postgres-support-case-recap-evuqjqhe8","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/postgres-support-case-recap-evuqjqhe8"},"datePublished":"2026-07-09T06:58:07.496Z","dateModified":"2026-07-09T07:02:26.868Z","description":"Explains the Postgres 'remaining connection slots are reserved' error (SQLSTATE 53300), what causes it, and how to resolve it. 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