<p>Error 1498 occurs when a CREATE or ALTER statement on a partitioned table omits one or more mandatory partition definitions.</p>
<p>MySQL Error 1498 ER_PARTITION_NOT_DEFINED_ERROR appears when a partitioned table is created or altered without listing every required partition. Define all partitions in the PARTITION BY clause or reorganize them correctly to resolve the issue.</p>
For the partitioned engine it is necessary to define all
MySQL throws ER_PARTITION_NOT_DEFINED_ERROR when you attempt to create or modify a partitioned table but fail to supply a complete set of partition definitions. The storage engine expects an explicit definition for each partition and halts the statement if any are missing.
Because partitions determine where rows live on disk, incomplete descriptions can corrupt logical data placement. The server therefore rejects the DDL statement, returning SQLSTATE HY000 and error code 1498.
The most frequent cause is omitting a partition that should cover the maximum or minimum range in a RANGE or LIST partition strategy. Developers often forget to add the final MAXVALUE partition after reorganising yearly ranges.
The error also arises when ALTER TABLE ADD PARTITION provides only the new partitions but not the existing ones, or when dynamic SQL generated by applications skips one date interval.
Fix the error by supplying a full, ordered list of partitions in your CREATE or ALTER statement. For RANGE or LIST strategies, ensure that every possible value maps to exactly one partition.
If you are adding partitions, use ALTER TABLE REORGANIZE PARTITION to replace old partitions with a new complete set rather than ADD PARTITION on its own.
During table creation, always finish RANGE partitions with a MAXVALUE partition so future dates have a home.
When splitting a yearly partition into quarters, replace the original yearly partition with four new quarterly partitions in a single REORGANIZE operation.
Automate partition DDL generation so that scripts calculate every needed partition definition deterministically. Validate the resulting SQL in a staging environment before running in production.
Monitor the slow query log and error log for partition-related messages, and schedule periodic checks to confirm that the latest date ranges are covered.
Error 1517 cannot drop partition referenced elsewhere - supply correct partition in DROP PARTITION or disable foreign keys.
Error 1503 parse error in partition function - review the PARTITION BY clause syntax.
Developers forget to add the catch-all partition that handles values beyond the highest defined range.
An ALTER TABLE statement replaces only some partitions, leaving gaps in the overall range.
Application code creates DDL at runtime and skips an interval when generating partition names.
Moving DDL between environments causes a missing partition line or wrong partition name.
Raised when attempting to drop a partition that is referenced by a subpartition or constraint.
Occurs when the partition expression syntax is invalid.
Appears when a row does not fit into the partition due to oversized columns.
Yes. Both versions require complete partition definitions and raise error 1498 if any are missing.
No. Use REORGANIZE PARTITION, which replaces the affected partitions with a full set, or ALTER TABLE EXCHANGE PARTITION for swaps.
Galaxy's AI copilot autocompletes correct PARTITION BY clauses and flags missing ranges during query review, reducing human mistakes.
Too many small partitions can slow planning and increase metadata, so balance partition count against query patterns.
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