<p>The error appears when a CREATE or ALTER TABLE statement specifies a different partition count than the table's existing partition configuration.</p>
<p>MySQL Error 1484: ER_PARTITION_WRONG_NO_PART_ERROR occurs when the partition count in a CREATE or ALTER TABLE statement differs from the table's previous setting. Align the partition definition with the existing number or redefine partitions consistently to resolve the issue.</p>
Wrong number of partitions defined, mismatch with
MySQL throws error 1484 when the number of partitions in a CREATE TABLE ... PARTITION BY or ALTER TABLE ... PARTITION statement does not match an existing partition layout. The engine detects a mismatch and blocks the operation to protect data integrity.
MySQL stores metadata about each partition. Mismatched counts can corrupt partition mapping or orphan data files. The server therefore requires that new partition definitions either match the current count or fully replace the existing scheme.
Typical triggers include adding partitions without using REORGANIZE PARTITION, migrating tables between servers with different defaults, or restoring dumps that omit PARTITION clauses. Version upgrades can also surface hidden inconsistencies.
First, confirm the table’s current partition count with SHOW CREATE TABLE. Then choose one of three paths: keep the same count, drop and recreate partitions, or convert the table to non-partitioned and re-partition from scratch. SQL examples appear below.
Altering range partitions for monthly fact tables, adding hash partitions for sharding, and importing dumps into differently configured servers are the most frequent real-world scenarios. Following the step-by-step fixes avoids downtime.
Standardize partition templates, script schema migrations, and validate partition counts in CI pipelines. Galaxy’s SQL editor highlights DDL differences and lets teams peer review partition changes before deployment, reducing production errors.
Error 1526 ER_PARTITION_MGMT_ON_NONPARTITIONED occurs when partition management is attempted on a non-partitioned table. Error 1503 ER_PARTITION_SUBPARTITION_ERROR arises when subpartition syntax is invalid. The same troubleshooting methods apply: inspect metadata, adjust DDL, and redeploy.
The initial CREATE statement lists a partition count that conflicts with an implicit or inherited definition.
Adding a single partition to a range scheme breaks the expected total count unless REORGANIZE PARTITION is used.
Restoring a table dump that lacks explicit PARTITION clauses onto a server with partitioned metadata causes a conflict.
Upgrades can reveal previously unnoticed discrepancies between metadata files and the .frm definition stored on disk.
Raised when an unsupported function appears in the partitioning expression.
Occurs if partition management commands target a non-partitioned table.
Triggered by invalid subpartition syntax or mismatched subpartition counts.
Yes. Partition metadata validation is stricter in 8.0, so mismatches surface immediately.
No. The server does not expose a mode to ignore partition count mismatches.
No. REMOVE PARTITIONING converts partitions into a single tablespace without deleting rows, but backups are still recommended.
Galaxy’s schema diff and AI copilot review DDL changes, warning you if a partition count is inconsistent before execution.
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