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Description

This error signifies that an SQL statement attempted to access a specific partition within a partitioned table, but the referenced partition does not exist. It commonly occurs when a query targets a partition that has been dropped, renamed, or was never correctly created.

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Error Message

Unknown partition '%s' in table '%s'

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Known Causes

4 known causes

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Partition Dropped or Renamed

The target partition in the SQL statement no longer exists because it was explicitly removed or its name was changed after the query was designed.

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Typographical Error in Partition Name

The SQL query contains a misspelling or an incorrect name for the intended partition, leading to a non-existent reference.

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Outdated Schema Reference

The application or client program is referencing a partition based on cached or old schema information that is no longer current.

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Flawed Partitioning Logic

The programmatic logic used to construct partition-specific queries generates names for partitions that do not align with the actual table structure.

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Solutions

3 solutions available

1. Verify Partition Name and Table Existence easy

Double-check the partition name and ensure the table exists and is partitioned.

1

Carefully review the SQL statement that triggered the error. Ensure the partition name specified (the '%s' in the error message) is spelled exactly as defined in the table's structure.

SELECT * FROM my_table PARTITION (incorrect_partition_name);

2

Check if the table itself exists in the database.

SHOW TABLES LIKE 'my_table';

3

If the table exists, verify its partitioning scheme and the exact names of its partitions.

SHOW CREATE TABLE my_table;

4

Correct the partition name in your query to match one of the existing partitions.

SELECT * FROM my_table PARTITION (correct_partition_name);

2. Recreate or Repair Partitioning Scheme medium

If the partitioning metadata is corrupted or inconsistent, re-creating the partitioning can resolve the issue.

1

Back up your data. This is a crucial step before making structural changes to your table.

mysqldump -u your_user -p your_database your_table > your_table_backup.sql

2

Identify the current partitioning definition by examining the output of `SHOW CREATE TABLE`.

SHOW CREATE TABLE my_table;

3

Drop the existing partitioning from the table. This will convert it to a non-partitioned table temporarily.

ALTER TABLE my_table REMOVE PARTITIONING;

4

Re-apply the partitioning using the definition obtained in step 2 (or a corrected version if you suspect issues with the original definition). Ensure the partition names are correct.

ALTER TABLE my_table PARTITION BY RANGE (column_name) (
    PARTITION p0 VALUES LESS THAN (10),
    PARTITION p1 VALUES LESS THAN (20)
);

5

Verify that the partitions are now correctly recognized by running a query.

SELECT * FROM my_table PARTITION (p0);

3. Address Table Corruption advanced

In rare cases, table corruption can lead to inconsistencies in partition information.

1

Check for table corruption. This command will check the table and report any errors.

CHECK TABLE my_table;

2

If corruption is detected, repair the table. This command attempts to fix any identified issues.

REPAIR TABLE my_table;

3

After repairing, re-verify the partitioning by running `SHOW CREATE TABLE` and then attempt the query that caused the error.

SHOW CREATE TABLE my_table;

4

If `REPAIR TABLE` fails or doesn't resolve the issue, consider restoring from a recent backup as a last resort.

mysql -u your_user -p your_database < your_table_backup.sql

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Related Errors

5 related errors

MariaDB Error 1735: Unknown Table Partition