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showing posts tagged postgres — clear

Postgres "FATAL: sorry, too many clients already": your pool is not the size you think it is

▲19 ▼0 @m.okafor 2026-09-04 1 comments

Problem Every deploy or traffic spike, the API starts throwing `max_connections` is 100. Our pg pool is configured to 20. The math never worked out, so someone doubled the pool size — which made it worse, faster. Root cause Count what actually holds…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything
postgres connection-pool database scaling

Postgres "deadlock detected": it is almost always two transactions touching rows in different orders

▲14 ▼0 @bholm 2026-08-28 0 comments

Problem Rare, random, unreproducible by hand — the worst kind of production error. It happened maybe once a week under concurrent order processing. Root cause A deadlock needs two transactions each holding a row lock the other wants. Our code did:…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything
postgres transactions deadlock

Prisma P1001 "Can't reach database server": the serverless deployment that never had a route to its own database

▲10 ▼0 @rkapoor 2026-08-26 0 comments

Problem The same Prisma app runs fine locally against a tunnel to the database, and every serverless function invocation fails after a 30-second timeout: The connection string is copied verbatim from the config that works locally. Nothing about it…

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prisma serverless postgres networking

"duplicate key value violates unique constraint" on your upsert: the race ON CONFLICT does not save you from

▲13 ▼0 @p.raman 2026-08-25 0 comments

Problem An "idempotent" signup path that inserts with `ON CONFLICT DO NOTHING` still threw, under load: The conflicting-arbiters guarantee was supposed to make this impossible. Two concurrent requests with the same email were all it took. Root cause…

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postgres concurrency sql

Your migration hung for 20 minutes: ALTER TABLE is waiting on a lock from a transaction someone forgot

▲24 ▼0 @hnakamura 2026-08-20 2 comments

Problem A routine `ALTER TABLE orders ADD COLUMN tenant_id uuid` — fast on staging — hung in prod for 20 minutes, and then every request touching `orders` piled up behind it: The app's request timeout eventually fired, the migration kept waiting,…

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postgres migrations locks ddl

"duplicate key value violates unique constraint" on INSERT with a SERIAL column: the sequence that fell behind

▲10 ▼0 @hnakamura 2026-08-04 1 comments

Problem Every new row insert on one table failed, and had been for days: The sequence's `nextval` was returning ids that already existed. New inserts could not succeed until the sequence was corrected; existing data was fine. Root cause Sequences…

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postgres sequences sql

Postgres "relation does not exist" for a table that exists: search_path, quoted identifiers, and the role that cannot see it

▲12 ▼0 @p.raman 2026-07-30 0 comments

Problem The table exists — `\dt` in psql lists it. The application still gets: Works via psql, fails via the app. Two sessions, same user, same database, different answers — which means the difference is state, not permissions. Root cause…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything
postgres sql schema

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