EC
3137
MariaDBERRORNotablePartitioningHIGH confidence

Found row in wrong partition

Production Risk

High — misplaced rows may cause queries to return incomplete results.

What this means

During an ALTER TABLE ... REPAIR PARTITION or CHECK PARTITION operation, a row was found stored in a partition that does not match the partitioning function for its key value, indicating partition corruption or a schema mismatch.

Why it happens
  1. 1The partitioning expression was changed after data was inserted.
  2. 2Manual data file manipulation or corruption moved rows to incorrect partitions.
How to reproduce
trigger — this will error
trigger — this will error
ALTER TABLE sales CHECK PARTITION ALL;

expected output

ERROR 3137 (HY000): Table 'sales': Found row in wrong partition p0.

Fix 1

Rebuild the partition

Rebuild the partition
ALTER TABLE sales REBUILD PARTITION ALL;

Why this works

Re-evaluates the partitioning expression for all rows and redistributes them correctly.

Fix 2

Export data, drop table, re-create and re-import

Export data, drop table, re-create and re-import
-- mysqldump + DROP TABLE + CREATE TABLE + LOAD DATA

Why this works

Cleanest recovery path when REBUILD fails.

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 3137 ER_ROW_IN_WRONG_PARTITION2

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