MySQL detected a record stored in a partition that no longer matches the table27s partitioning rules.
MySQL error 1863 ER_ROW_IN_WRONG_PARTITION means MySQL detected a row stored in an incorrect partition. Rebuild or reorganize the affected table27s partitions with ALTER TABLE ... REORGANIZE PARTITION to move rows to the correct location.
ER_ROW_IN_WRONG_PARTITION
MySQL raises error 1863 when it finds a data row in a partition different from the one defined by the current partitioning scheme. The mismatch triggers a runtime exception during query execution or maintenance tasks.
The anomaly appears after schema changes, bulk data loads, or server upgrades that alter partition boundaries. Fixing it promptly is critical because misplaced rows can break indexes, replication, and backup consistency.
Altering RANGE or LIST partition definitions without moving existing rows leaves historical data in obsolete partitions, producing the error on access.
Large LOAD DATA or INSERT operations that omit explicit PARTITION clauses may land rows in default partitions even when keys fall outside the defined ranges.
Use ALTER TABLE ... REORGANIZE PARTITION or REBUILD PARTITION to migrate rows to the correct partitions. For heavily used tables, rebuild one partition at a time to minimize locking.
After the move, run ANALYZE TABLE to update statistics and check again. Replicas must receive the same fix or a fresh dump to stay consistent.
If the error emerges right after an ALTER TABLE that changed partition ranges, a full REBUILD PARTITION is usually enough.
When the issue surfaces only on replicas, use pt-table-sync or restore from a fresh dump to realign the partitions with the primary server.
Always follow partition-altering DDL with a data migration step using REORGANIZE PARTITION or OPTIMIZE TABLE so existing rows relocate correctly.
Schedule periodic CHECK TABLE or mysqlcheck jobs to detect misplaced rows early. Galaxy27s version control reminders help ensure teams run maintenance commands after each schema change.
Errors 1526 (ER_NO_PARTITION_FOR_GIVEN_VALUE) and 1504 (ER_PARTITION_CONST_DOMAIN_ERROR) also indicate partition definition problems. Reviewing partition rules and rebuilding data resolves them similarly.
Altering partition ranges or list values without reorganizing data leaves legacy rows in outdated partitions.
LOAD DATA or INSERT statements without matching keys to partitions can insert rows into unintended partitions, later flagged by MySQL.
Differing MySQL versions or configurations between primary and replica can cause partition mismatches that surface as error 1863.
Server crashes during partition maintenance may move only a subset of rows, corrupting partition placement.
No partition matches the inserted key. Usually fixed by updating partition ranges.
Partition function returns a value outside allowed domain. Review expression and ranges.
Partitioning expression must be deterministic. Replace non-constant functions.
Attempted to drop a partition that does not exist. Verify partition names.
The DDL changed partition boundaries but did not move existing rows, so MySQL later flagged rows still in old partitions.
Yes, but it locks partitions during the operation. Rebuild one partition at a time or during low-traffic windows to reduce impact.
Ignoring the error risks inconsistent backups, replication failures, and inaccurate query results. Always fix immediately.
Galaxy27s schema-change guardrails and versioned queries remind developers to run REORGANIZE or OPTIMIZE commands after partition DDL.
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