<p>The REORGANIZE PARTITION statement tried to change the total number of range partitions, which MySQL forbids except for enlarging the final range.</p>
<p>MySQL Error 1520 ER_REORG_OUTSIDE_RANGE occurs when a REORGANIZE PARTITION operation adds or removes range partitions instead of keeping the same count. Keep all original ranges and only extend the highest one to resolve the issue.</p>
Reorganize of range partitions cannot change total ranges
The error message Reorganize of range partitions cannot change total ranges appears when MySQL rejects a REORGANIZE PARTITION command on a RANGE partitioned table.
MySQL allows you to redefine the upper bound of the last range partition, but it does not permit adding or dropping intermediate ranges during a single REORGANIZE operation.
The error fires during ALTER TABLE ... REORGANIZE PARTITION statements that specify a new partition list whose count differs from the existing one. It is most common when developers attempt to merge or split range partitions in a single command.
It can also occur in automated scripts that roll partitions forward each month but accidentally include one too many or too few definitions.
Leaving the partition scheme unchanged hampers data management, causes oversized partitions, and slows queries on date-range data. Correct partition maintenance keeps queries fast and storage balanced.
Fixing the error ensures that maintenance windows run smoothly and prevents outages caused by failed DDL statements.
A mismatch between the current number of range partitions and the new list supplied in REORGANIZE PARTITION triggers the error.
Using VALUES LESS THAN clauses that introduce new boundaries or remove existing ones without a corresponding DROP PARTITION step also raises the error.
Reissue the REORGANIZE PARTITION statement with exactly the same count of partitions, only changing the VALUES LESS THAN limit of the final partition.
If you need to add or remove ranges, perform multiple steps: first SPLIT or DROP partitions, then optionally MERGE others.
Monthly rollovers: extend the highest partition to cover the new month, then create a fresh MAXVALUE partition.
Splitting a hot partition: use ALTER TABLE ... SPLIT PARTITION before reorganizing ranges.
Automate partition management scripts with validation that counts partitions before issuing REORGANIZE.
Use descriptive partition names (p202401, p202402) to keep boundaries clear and reduce manual mistakes.
Error 1517 iterator: occurs when splitting partitions with overlapping ranges. Ensure non-overlapping VALUES LESS THAN clauses.
Error 1731 invalid partition name: resolve by matching naming conventions when adding partitions.
The REORGANIZE list defines more or fewer partitions than currently exist.
Combining two ranges into one during REORGANIZE changes the count and triggers the error.
Automation scripts may append a duplicate partition boundary, altering the total.
Omitting an existing partition from the new list effectively removes it, violating the rule.
Raised when subpartition definitions conflict with partition rules.
Occurs when a partition name is invalid or duplicated during ALTER TABLE.
Appears when the partitioning function contains disallowed expressions.
No. You must keep the same number of partitions. Use SPLIT or DROP commands first.
No. Only the final range can be changed in place. Adjust others by splitting or merging.
The error is logical, not operational. Online DDL will still fail if the partition count changes.
Galaxy’s schema-aware autocomplete flags invalid partition operations and lets teams review DDL scripts before execution.
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