# TX_CONFLICT — transaction serialization conflict

The underlying storage detected a serialization failure (e.g., PostgreSQL error 40001 or 40P01) and aborted the transaction. Normal occurrence under concu…

<em>cyoda-go version <a href="https://github.com/Cyoda-platform/cyoda-go/releases/tag/v0.6.2">0.6.2</a></em>

# errors.TX_CONFLICT

## NAME

TX_CONFLICT — the transaction was aborted because it conflicted with a concurrent transaction at the storage level.

## SYNOPSIS

HTTP: `409` `Conflict`. Retryable: `yes`.

## DESCRIPTION

The underlying storage detected a serialization failure (e.g., PostgreSQL error 40001 or 40P01) and aborted the transaction. Normal occurrence under concurrent write load when using serializable or repeatable-read isolation.

Retryable. The entire transaction — including any data read inside it — must be restarted from the beginning.

## SEE ALSO

- errors
- errors.CONFLICT
- errors.EPOCH_MISMATCH
- errors.IDEMPOTENCY_CONFLICT

## See also

- [`cyoda help errors`](/help/errors/) — Every error response from the Cyoda REST API carries a structured `errorCode` in the `properties` object. Multiple codes may share the same HTTP status. Programmatic handling keys on `errorCode`, not HTTP status.
- [`cyoda help errors CONFLICT`](/help/errors/conflict/) — The server detected that the entity was modified by another writer between the time it was read and the time the current write was committed. Normal outcome under concurrent load.
- [`cyoda help errors EPOCH_MISMATCH`](/help/errors/epoch_mismatch/) — Shard ownership is tracked by an epoch counter that increments whenever the cluster re-partitions. A write is rejected with this error when the writing node's cached epoch is stale — another node has since taken ownership of the shard. This prevents split-brain writes.
- [`cyoda help errors IDEMPOTENCY_CONFLICT`](/help/errors/idempotency_conflict/) — The idempotency key is supplied via the `Idempotency-Key` HTTP header on collection create and update requests. See `crud` for the request shape.

## Raw formats

- [`/help/errors/tx_conflict.json`](/help/errors/tx_conflict.json) — full descriptor (matches `GET /help/{topic}` envelope)
- [`/help/errors/tx_conflict.md`](/help/errors/tx_conflict.md) — body only