<p>MySQL cannot find the partition named in the query or DDL statement.</p>
<p>MySQL Error 1749: ER_NO_SUCH_PARTITION__UNUSED signals that the referenced partition name is missing from the table definition. Verify the partition name, refresh metadata, or recreate the partition to resolve the problem.</p>
partition '%s' doesn't exist
MySQL raises this error when a query or DDL statement refers to a table partition that the server cannot locate in the storage engine metadata.
The message partition '%s' doesn't exist means the partition name supplied in ALTER TABLE, SELECT, UPDATE, or DELETE is absent from the table definition on disk.
It appears during partition maintenance commands, partition-pruning queries, backup restores, or after manual file manipulation that desynchronizes table metadata.
Developers often meet it after renaming partitions, importing dump files, or upgrading servers without rebuilding partition structures.
Queries that rely on missing partitions can silently omit data, break ETL pipelines, or block schema changes. Fixing it restores data integrity and keeps automated jobs running.
The supplied partition name does not match the exact case-sensitive name stored in the .frm or data dictionary.
A previous ALTER TABLE ... DROP PARTITION removed the partition, but application code still references it.
File system issues or abrupt shutdowns left the storage engine metadata out of sync with physical .ibd files.
A dump was imported without partitions, or the target server has different partitioning rules.
Occurs when partition definitions are invalid during table creation.
Triggered by illegal partitioning functions.
Raised when a duplicate partition name is supplied.
The error itself does not delete rows, but a missing partition can hide data until fixed.
Ignoring it risks silent data gaps. Always reconcile partition lists to ensure completeness.
Index rebuilds do not restore missing partitions. You must recreate or reference existing partitions.
Galaxy validates partition names in real time and highlights mismatches, reducing runtime surprises.
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