<p>ER_XAER_RMERR signals that the storage engine’s resource manager reported a fatal failure while processing an XA distributed transaction branch.</p>
<p>MySQL Error 1401: ER_XAER_RMERR arises when the resource manager encounters a fatal issue during an XA transaction branch, leaving the branch ‘in-doubt’. Inspect existing XA transactions with SHOW XA TRANSACTIONS, recover or roll back dangling branches, and verify engine logs to restore consistency.</p>
XAER_RMERR: Fatal error occurred in the transaction
Error 1401 appears as “XAER_RMERR: Fatal error occurred in the transaction”. MySQL raises it when a storage engine participating in a two-phase XA transaction reports a non-recoverable failure.
The server marks the branch as heuristic or ‘in-doubt’, preventing COMMIT or ROLLBACK until manual recovery. Ignoring it risks data divergence across distributed nodes.
An unresolved XA branch leaves inconsistent rows between participating systems. Replication lag, billing mismatches, or lost orders can result if the error is not fixed promptly.
Production databases using message queues, microservices, or financial workflows often rely on XA for atomicity. Rapid diagnosis protects data integrity.
MySQL surfaces ER_XAER_RMERR when the storage engine crashes, times out, or detects corruption while preparing or committing an XA branch.
Network splits, disk exhaustion, mis-configured innodb_flush_log settings, or a bug in the engine plugin can also trigger the resource-manager error flag.
First, list all in-doubt XA branches with SHOW XA TRANSACTIONS. Investigate engine logs to determine whether the prepare phase completed.
If the branch is prepared, issue XA COMMIT xid; otherwise run XA ROLLBACK xid; to clear the entry. Finally, restart the offending service after verifying file-system health.
During a high-load batch job, InnoDB may time out flushing redo logs. Increasing innodb_log_file_size and innodb_flush_log_at_trx_commit to 2 avoids repeated RMERR events.
In a sharded payment system, one node crash-loops mid-prepare. Use GALAXY’s query history to locate the failing xid, recover state, and redeploy the container with corrected mount permissions.
Keep XA transactions short and idempotent. Monitor SHOW ENGINE INNODB STATUS for flushed LSN lag.
Enable automated Galaxy Collections that audit long-running XA branches, adding alerts when a branch stays prepared longer than 30 seconds.
ER_XAER_NOTA signals unknown xid during commit. Ensure the xid exists before issuing XA COMMIT.
ER_XAER_RMFAIL indicates temporary resource-manager unavailability; retrying often succeeds.
An abrupt InnoDB or NDB shutdown while preparing or committing an XA branch triggers a fatal RMERR flag.
Out-of-space or corrupted redo files prevent the engine from persisting the 2-PC log record, causing MySQL to abort the branch.
If a participating service loses connectivity, the resource manager reports a fatal error to avoid inconsistent state.
Very low innodb_lock_wait_timeout or lock_wait_timeout values may force an early abort that surfaces as RMERR.
Raised when MySQL cannot find the supplied xid during COMMIT or ROLLBACK.
Indicates an invalid XA argument such as malformed xid or unsupported flag.
Resource manager is temporarily unavailable; usually resolves after retry.
Transaction was rolled back intentionally, not due to a fatal error.
Data corruption is rare. The error flags an in-doubt XA branch. Manual commit or rollback restores consistency.
No. The branch remains in the mysql.xa_recover table until cleaned up. Ignoring it can stall future XA commits.
Versions before 8.0.30 had more XA edge-case bugs. Upgrade and apply the latest minor release to reduce risk.
Galaxy surfaces long-running XA statements in query history, auto-suggests recovery SQL, and enables collaborative review before execution.
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