EC
1523
MySQLERRORNotablePartitioningHIGH confidence

More partitions to reorganize than there are partitions

Production Risk

Low — the ALTER TABLE fails; no data is affected.

What this means

ER_REORG_PARTITION_NOT_EXIST (1523, SQLSTATE HY000) is raised when REORGANIZE PARTITION references more or different partition names than those that actually exist.

Why it happens
  1. 1Specifying non-existent partition names in ALTER TABLE REORGANIZE PARTITION
  2. 2Typo in partition names in the REORGANIZE statement
How to reproduce
trigger — this will error
trigger — this will error
ALTER TABLE t REORGANIZE PARTITION p99, p100 INTO (
  PARTITION pnew VALUES LESS THAN (1000)
);
-- p99 and p100 do not exist

expected output

ERROR 1523 (HY000): More partitions to reorganize than there are partitions

Fix

Verify partition names before reorganizing

Verify partition names before reorganizing
SELECT PARTITION_NAME FROM information_schema.PARTITIONS
WHERE TABLE_SCHEMA = 'mydb' AND TABLE_NAME = 't';

ALTER TABLE t REORGANIZE PARTITION p0, p1 INTO (
  PARTITION pnew VALUES LESS THAN (1000)
);

Why this works

Confirming existing partition names prevents REORGANIZE errors.

Sources
Official documentation ↗

MySQL 8.0 — 1523 ER_REORG_PARTITION_NOT_EXIST

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