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Description

This error indicates that you are attempting to create or modify a table with a partition name that already exists within the same table. MariaDB requires all partition names within a single partitioned table to be unique to ensure proper data management and retrieval, preventing this operation from completing.

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Error Message

Duplicate partition name %s

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Known Causes

4 known causes

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Intentional Partition Name Reuse

An attempt was made to define a new partition with a name already used by an existing partition in the same table.

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Case-Insensitive Naming Conflict

On systems where partition names are treated as case-insensitive, a new partition name might conflict with an existing one that only differs in letter casing.

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Scripting or Tooling Error

Automated scripts or database management tools generated or applied a duplicate partition name during schema modification.

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Manual Schema Duplication

Copying and pasting schema definitions without updating partition names can inadvertently introduce duplicates.

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Solutions

3 solutions available

1. Rename the Conflicting Partition easy

Identify and rename the duplicate partition name within the table definition.

1

Identify the table and the offending partition name. The error message `Duplicate partition name %s` will usually provide the problematic name. You can also query `information_schema.PARTITIONS` to find all partition names for a specific table.

SELECT PARTITION_NAME FROM information_schema.PARTITIONS WHERE TABLE_SCHEMA = 'your_database_name' AND TABLE_NAME = 'your_table_name';

2

Drop the existing partition with the duplicate name. Be cautious, as this will remove the data in that partition. Ensure you have backups if the data is important.

ALTER TABLE your_table_name DROP PARTITION existing_partition_name;

3

Recreate the partition with a unique name. If you are adding a new partition, ensure the name you choose is not already in use. If you are modifying an existing partition's definition, you might need to drop and recreate it with a new name.

ALTER TABLE your_table_name ADD PARTITION (PARTITION new_unique_partition_name VALUES LESS THAN (value));

2. Review and Correct Partitioning Strategy medium

Thoroughly examine the table's partitioning scheme to resolve naming conflicts and ensure logical structure.

1

Examine the `CREATE TABLE` statement or `ALTER TABLE` statements that defined the partitioning for the table. Look for any instances where the same partition name is used multiple times, either explicitly or implicitly through range/list definitions.

SHOW CREATE TABLE your_table_name;

2

If you find duplicate partition names, decide which partition definition is correct. You will need to either drop the incorrect partition definition or rename it to something unique.

Example: If 'p_2023_q1' is duplicated, you might drop one and rename the other if they represent different data ranges.

3

Modify the `ALTER TABLE` statement to correct the naming. This might involve dropping and recreating partitions, or modifying the existing `ALTER TABLE` statements to use unique names.

ALTER TABLE your_table_name DROP PARTITION duplicate_name;
ALTER TABLE your_table_name ADD PARTITION (PARTITION unique_name VALUES LESS THAN (value));

4

If the duplicate name arose from an automated script or process, review and fix the logic of that script to prevent future occurrences.

N/A (Process review)

3. Recreate Table with Unique Partition Names advanced

As a last resort, create a new table with the correct partitioning and migrate data.

1

Create a new table with the same schema as the original table but with a corrected and unique set of partition names. Ensure all columns, indexes, and constraints are replicated.

CREATE TABLE new_table_name LIKE your_table_name;
-- Then, recreate the partitioning with unique names on new_table_name

2

Use `INSERT INTO ... SELECT FROM` to copy data from the original table to the new table. This can be done partition by partition if the table is very large.

INSERT INTO new_table_name SELECT * FROM your_table_name;

3

Verify the data integrity in the new table. Compare row counts and sample data from both tables.

SELECT COUNT(*) FROM your_table_name;
SELECT COUNT(*) FROM new_table_name;

4

Rename the original table to a backup name and then rename the new table to the original table's name.

RENAME TABLE your_table_name TO your_table_name_backup, new_table_name TO your_table_name;

5

Drop the backup table after confirming everything is working as expected.

DROP TABLE your_table_name_backup;

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Related Errors

5 related errors

MariaDB Error 1517: Duplicate Partition Name