<p>MySQL raises Error 1737 when a row exists in a partitioned table but its partitioning key no longer maps the row to that partition, indicating data corruption or an incorrect partition definition.</p>
<p>MySQL Error 1737: ER_ROW_DOES_NOT_MATCH_PARTITION occurs when a row sits in the wrong partition after key changes, ALTER TABLE, or corrupt data. Rebuild the table or move the row with ALTER TABLE ... REORGANIZE PARTITION to resolve it.</p>
Found a row that does not match the partition
Error 1737 triggers when MySQL scans a partitioned table and finds a row stored in a partition that its current partitioning expression would not place it in. The engine interprets this mismatch as data corruption and aborts the statement.
The problem usually surfaces after an ALTER TABLE that changes a partition key, a failed bulk load, or a manual UPDATE that bypassed partition checks. Ignoring it risks wrong query results and further corruption, making prompt repair essential.
Partition definition changes without rebuilding data leave orphan rows in old partitions. When MySQL later validates the key, the mismatch is detected and error 1737 is raised.
Bulk INSERT or LOAD DATA operations interrupted mid-way can write rows into incorrect partitions, especially under heavy concurrency or when foreign keys cascade.
Application code that disables foreign_key_checks or unique checks and then updates the partition key columns can inadvertently move rows outside their target partition.
Locate the offending rows by running CHECK TABLE … EXTENDED or selecting rows whose partitioning columns do not evaluate to their CURRENT_PARTITION value using the INFORMATION_SCHEMA.PARTITIONS table.
Once identified, move the rows to the correct partition with ALTER TABLE … REORGANIZE PARTITION or rebuild the entire table with ALTER TABLE … REMOVE PARTITIONING followed by re-partitioning.
After altering a RANGE partition key: export the table with mysqldump, drop partitions, recreate them with the new expression, and reload the data to guarantee alignment.
During online DDL with pt-online-schema-change: ensure the tool finishes successfully; if interrupted, swap tables back or rerun the migration to force a full copy.
Always use ALTER TABLE … UPGRADE PARTITIONING after modifying partition keys so MySQL rewrites all rows to correct partitions.
Enable strict SQL mode and avoid disabling foreign_key_checks during mass updates to partition keys.
Regularly run CHECK TABLE on critical partitioned tables and automate alerts in Galaxy so engineers spot misplacements early.
Error 1526: Table has no partition for value appears when inserting rows that do not match any partition; fix by adding a suitable partition.
Error 1735: Cannot drop partitioning index - occurs when dropping an index used in the partition function; add a new compatible index first.
Error 1465: Triggers can only be created on base tables - shows up if you attempt triggers on partitioned views.
Changing the column list or expression in the PARTITION BY clause without rebuilding data leaves misplaced rows.
Crashes or kill signals during INSERT INTO ... SELECT or LOAD DATA may leave rows partially written to incorrect partitions.
Updates that modify partition key values while foreign_key_checks or unique checks are off bypass partition validation.
File system errors or MySQL bugs can corrupt the .ibd or .par files, misplacing rows across partitions.
Raised when an INSERT tries to add a row whose key does not fit any defined partition.
Occurs when you attempt to drop the index that underpins the partitioning function without creating a replacement.
Signals a syntax or boundary mistake in the PARTITION BY clause during table creation or alteration.
Not always. It indicates at least one row is in the wrong partition but the underlying data files may still be intact. Moving or rebuilding partitions usually repairs the issue.
Ignoring the error risks silent data loss and incorrect query results because partition pruning might skip misplaced rows. Always resolve it immediately.
OPTIMIZE TABLE may help for InnoDB, but it does not guarantee re-partitioning. Use ALTER TABLE ... REORGANIZE PARTITION or a full rebuild for a reliable fix.
Galaxy logs failed queries, surfaces MySQL error codes in the editor, and lets teams run scheduled health checks with saved CHECK TABLE scripts to catch partition mismatches early.
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