<p>The table’s .frm file contains partition metadata that no longer matches what MySQL can generate, so the server refuses to open or alter the table.</p>
<p>MySQL Error 1490: ER_INCONSISTENT_PARTITION_INFO_ERROR arises when the partition data stored in a table’s .frm file differs from what MySQL expects. Rebuild the table with a fresh CREATE TABLE ... PARTITION BY statement or drop and recreate partitions to resolve the mismatch.</p>
The partition info in the frm file is not consistent with
The server raises Error 1490 when it detects that the partition information embedded in the table’s .frm file is corrupted or inconsistent with internal expectations.
MySQL stores partition definitions inside .frm files. If that metadata becomes stale - for example after manual file copies or an interrupted ALTER TABLE - the server blocks further access and surfaces this error.
The problem surfaces immediately when the table is opened for any read, write, or DDL operation. Statements like SELECT, INSERT, ALTER TABLE, or CHECK TABLE will all fail until the metadata mismatch is resolved.
An inconsistent .frm stops you from querying or altering the affected table. Left unresolved, it can halt production workloads and break dependent applications. Restoring partition consistency is therefore a high-priority task.
Partition metadata divergence can happen after manual file operations, aborted DDL, version downgrades, or incorrect mysqldump imports. Each scenario leaves the .frm out of sync with the storage engine’s view.
Rebuilding the table definition is the fastest cure. Use CREATE TABLE ... LIKE to clone structure, then INSERT ... SELECT to migrate data. Alternatively drop and recreate the faulty partitions if only one range or list entry is corrupt.
Scenario: copied .frm from another server. Solution: recreate table from proper backup.
Scenario: ALTER TABLE aborted mid-operation. Solution: use OPTIMIZE TABLE or full rebuild.
Avoid manual file manipulations, always run ALTER TABLE in transactional mode, and test partition DDL on staging. Continuous backups and checksum monitoring detect drift early.
Similar partition errors include 1507 (ER_PARTITION_CONST_DOMAIN_ERROR) and 1526 (ER_PARTITION_REQUIRES_VALUES_ERROR). Fixes often involve inspecting partition definitions and rebuilding tables.
Copying or renaming .frm files between servers without the matching .ibd or partition directories breaks metadata alignment.
A crash or kill -9 during ALTER TABLE ... PARTITION leaves partially written metadata in the .frm file.
Restoring a table created by a newer MySQL release to an older server introduces unsupported partition options, triggering error 1490.
Importing CREATE TABLE statements that differ from the original .frm definitions causes inconsistency during table open.
Raised when partition expressions contain non-constant values.
Indicates a referenced column is missing from the partition key.
Occurs when the VALUES clause is absent in RANGE/LIST partition definitions.
Triggered when the total length of partition keys exceeds engine limits.
Yes. Rebuild the table with CREATE TABLE ... LIKE and migrate data. The original rows remain intact during the process.
Sometimes. OPTIMIZE rewrites the .frm and can clear minor mismatches. If it fails, use full rebuild.
It affects all engines that rely on .frm files (InnoDB, MyISAM). The root cause is the shared .frm metadata.
Galaxy’s version control and AI copilot document partition DDL, reducing manual edits that often lead to inconsistent .frm files.
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