<p>Raised when a query or ALTER TABLE statement references a subpartition name that does not exist in the table definition.</p>
<p>MySQL Error 1634 ER_SUBPARTITION_NAME appears when a statement names a subpartition that the table does not contain. Check the real subpartition names with SHOW CREATE TABLE, correct any typos, or recreate the missing subpartition to clear the error.</p>
Subpartition
The server returns ER_SUBPARTITION_NAME when a statement specifies a subpartition that is absent from the table's partitioning scheme. MySQL aborts the operation because it cannot locate the requested data slice.
The message usually reads: Subpartition 'name' not found. The error comes with SQLSTATE HY000, signaling a general runtime problem rather than a syntax mistake.
The error surfaces during SELECT, INSERT, UPDATE, DELETE, or ALTER TABLE commands that include the PARTITION or SUBPARTITION clause. It is common in maintenance actions like REORGANIZE PARTITION or EXCHANGE PARTITION.
It can also appear in backup or load jobs that target individual subpartitions, especially after schema changes remove or rename them.
Ignoring the error blocks DML and DDL on the affected table, halting data flows and scheduled jobs. Production systems relying on partition pruning lose performance benefits when queries fall back to scanning full tables.
Timely resolution restores partition-level operations, keeps automation running, and prevents downstream ETL or reporting failures.
Galaxy's schema browser lists partitions and subpartitions in real time. Engineers can inspect definitions without leaving the editor, correct the query with AI copilot suggestions, and rerun it instantly to verify the fix.
A single wrong character or incorrect case causes MySQL to treat the name as unknown.
The table was defined with partitions only, but the query mistakenly references a subpartition.
Maintenance scripts may merge or drop subpartitions, leaving orphaned references in application code or jobs.
Running the query on a replica with a slightly different partition layout triggers the error.
Raised when a referenced partition, not subpartition, is missing.
Triggered by a mismatch between partition columns and defined list in CREATE TABLE.
Occurs when mixing partitioning types incorrectly during table creation.
No. MySQL must resolve all partition names at parse time, so the only fix is correcting the reference.
Yes for filesystems that treat table names as case sensitive. Always match exact casing.
It works but is excessive. Identify and fix the specific subpartition reference instead.
No. Galaxy suggests fixes and executes statements you approve, maintaining full control.
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