The query supplies an explicit value that collides with the next AUTO_INCREMENT number, so MySQL aborts the statement to protect primary-key uniqueness.
MySQL error ER_AUTO_INCREMENT_CONFLICT occurs when an UPDATE or INSERT supplies a value that clashes with the engine’s next auto increment. Remove or adjust the explicit value, or reseed the AUTO_INCREMENT counter, to resolve the conflict.
ER_AUTO_INCREMENT_CONFLICT
MySQL raises error 1869 when an UPDATE or INSERT ON DUPLICATE KEY UPDATE statement tries to set an AUTO_INCREMENT column to a value that duplicates the internal counter reserved for the same operation. The engine blocks the change to preserve primary key uniqueness.
The error was introduced in MySQL 5.7.2. Earlier releases could silently overwrite rows, so the new behaviour prevents hard-to-detect data loss during replication, bulk loads or manual maintenance.
The most common trigger is an UPDATE that explicitly changes the primary key to a number equal to the next AUTO_INCREMENT value that MySQL has already picked. The clash surfaces only when the write occurs in the same statement batch.
Cloning data between servers, replaying binlogs and manual key repairs can also introduce conflicting values. Large gaps in AUTO_INCREMENT sequences or parallel sessions with high concurrency increase the odds.
First verify the current AUTO_INCREMENT value with SHOW TABLE STATUS or information_schema tables. If the conflicting value is unneeded, remove it from the UPDATE. If you must keep it, reseed the counter above the highest key.
After adjusting the key or counter, retry the statement. Always test in a transaction or staging database before running on production.
During replication, ensure the replica uses the same insert order as the primary. If gap handling is different, reseed AUTO_INCREMENT on both nodes to the same upper bound.
During bulk loads, insert data in ascending key order or disable AUTO_INCREMENT updates and let MySQL assign keys, then reseed if necessary.
Never hard-code primary key values unless absolutely required. Use placeholders and let MySQL assign keys automatically.
Monitor AUTO_INCREMENT columns with periodic queries, and set alerts when counters near integer limits. Galaxy’s schema browser surfaces current counters so conflicts are caught before deployment.
Error 1062 duplicate key means a direct key collision rather than a reservation clash. Error 1205 lock wait timeout may appear if many sessions contend for the same AUTO_INCREMENT counter. Resolve by following similar key management practices.
An UPDATE statement sets the AUTO_INCREMENT column to a value MySQL already earmarked for the same write.
Different row execution order on replica and primary leads to conflicting keys during row-based replication.
Scripts that copy rows with fixed primary keys ignore existing counters and create clashes.
High-throughput workloads reserve keys in multiple sessions, increasing the chance of overlaps.
Occurs when a unique index violation happens directly, not due to reserved keys.
Shows that sessions are blocked while waiting for the AUTO_INCREMENT lock, often seen in high concurrency.
Indicates storage layer issues that can also interrupt auto increment generation.
Yes, but only when INSERT uses ON DUPLICATE KEY UPDATE or a similar clause that updates the AUTO_INCREMENT column within the same statement.
No. MySQL enforces this guard to protect data integrity. The only remedy is to change your query or reseed the counter.
Moving to BIGINT prevents exhaustion but does not remove conflicts with reserved keys. Proper key management is still required.
Galaxy surfaces current AUTO_INCREMENT values in its schema panel and flags manual key edits in reviews, preventing conflicts before they reach production.
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