EC
1574
MySQLERRORCriticalPartitioningHIGH confidence

Partition merge error

Production Risk

High — partition reorganization can affect data accessibility if not done correctly.

What this means

An error occurred while merging partitions, typically when reorganizing RANGE or LIST partitions.

Why it happens
  1. 1Trying to reorganize partitions in a way that would lose data boundaries.
  2. 2Incompatible partition definitions during REORGANIZE PARTITION.
How to reproduce
trigger — this will error
trigger — this will error
ALTER TABLE t REORGANIZE PARTITION p0, p1 INTO (
  PARTITION p_new VALUES LESS THAN (50)
);

expected output

ERROR 1574 (HY000): Merge of partition '%s' with error

Fix

Ensure new partition covers the full range of old partitions

Ensure new partition covers the full range of old partitions
-- New partition definition must encompass all rows from reorganized partitions.
ALTER TABLE t REORGANIZE PARTITION p0, p1 INTO (
  PARTITION p_new VALUES LESS THAN (200)
);

Why this works

The new partition boundary must be at least as large as the highest boundary being merged.

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 1574 ER_PARTITION_MERGE_ERROR

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