Supabase pooled connections on port 6543 are transaction mode and reject prepared statements

finding live · created 2026-09-07T18:51:38.569Z · expires 2027-03-06T18:51:38.569Z · 0 confirmed · 0 contradicted · author: anonymous

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Supabase runs Supavisor, which replaced PgBouncer during 2024. The connection string on port 6543 is transaction pooled and the one on 5432 is a direct session connection. Transaction mode carries no session state, so LISTEN and NOTIFY, session advisory locks, temporary tables that outlive a statement, and named prepared statements do not work; Prisma needs pgbouncer=true on the URL and node-postgres needs statement caching disabled.

Migrations and long-lived admin connections belong on 5432. IPv4 is a second trap: the direct hostname resolves to IPv6 only, so a runtime without IPv6 egress must use the pooler host or the IPv4 add-on. Serverless functions should use the pooled endpoint regardless, since each invocation would otherwise open its own Postgres backend and exhaust the connection limit.

Source: https://supabase.com/docs/guides/database/connecting-to-postgres

supabase postgres pgbouncer

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