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Description

This error signifies that an `ALTER TABLE ... ADD PARTITION` statement was executed without specifying any new partitions to be added. It occurs when you attempt to modify a partitioned table to include additional data divisions, but the command is syntactically incomplete or lacks the actual partition definitions.

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Error Message

At least one partition must be added

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Known Causes

3 known causes

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Missing ADD PARTITION Clause

The `ALTER TABLE` statement was used to modify a partitioned table, but the `ADD PARTITION` clause, which specifies the new partitions, was entirely omitted from the command.

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Empty Partition List

The `ADD PARTITION` clause was present, but it contained an empty list of partition definitions, meaning no actual new partitions were specified within the clause.

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Invalid Partition Syntax

While attempting to define new partitions, the syntax used within the `ADD PARTITION` clause was incorrect or malformed, rendering the definitions unusable by MySQL.

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Solutions

3 solutions available

1. Add Missing Partition Definition to Existing Table medium

Manually add a partition definition to an existing table that was supposed to be partitioned.

1

Identify the table that is causing the error. This usually happens when you attempt to perform an operation that requires partitioning on a table that was intended to be partitioned but had no partitions defined. You can typically find this information in the MySQL error log.

2

Determine the partitioning strategy (e.g., RANGE, LIST, HASH, KEY) and the columns to be used for partitioning.

3

Define at least one partition for the table. This example uses RANGE partitioning for a `date_col`. Replace `your_table`, `date_col`, `partition_name`, and the `VALUES LESS THAN` clause with your specific details.

ALTER TABLE your_table PARTITION BY RANGE (date_col) (
    PARTITION partition_name VALUES LESS THAN (TO_DAYS('2023-01-01'))
);

4

If you have other tables that should be partitioned similarly, repeat the `ALTER TABLE` statement for them.

2. Recreate Table with Proper Partitioning medium

If the table is relatively new or can be recreated easily, recreate it with a correct partitioning definition.

1

Backup your data from the problematic table. This can be done using `mysqldump` or by creating a temporary table with the data.

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

2

Drop the existing, incorrectly defined table.

DROP TABLE your_table;

3

Create the table again, this time including a valid `PARTITION BY` clause with at least one partition definition. This example uses RANGE partitioning. Adjust `your_table`, `column_name`, `partition_name`, and the `VALUES LESS THAN` clause to match your requirements.

CREATE TABLE your_table (
    id INT AUTO_INCREMENT PRIMARY KEY,
    column_name VARCHAR(255),
    date_col DATE
) PARTITION BY RANGE (TO_DAYS(date_col)) (
    PARTITION p0 VALUES LESS THAN (TO_DAYS('2023-01-01'))
);

4

Restore the data into the newly created table.

mysql -u your_user -p your_database < your_table_backup.sql

3. Disable Partitioning for the Table easy

If partitioning is not strictly required, remove the partitioning definition from the table.

1

Identify the table that has the incorrect partitioning setup.

2

Alter the table to remove the partitioning clause. This effectively converts the table back to a non-partitioned table. Note that this might require recreating the table if your MySQL version doesn't directly support removing partitioning without recreation.

ALTER TABLE your_table REMOVE PARTITIONING;

3

If the `REMOVE PARTITIONING` command fails or is not supported, you will need to follow the steps in 'Recreate Table with Proper Partitioning' but omit the `PARTITION BY` clause during table creation.

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Related Errors

5 related errors

MySQL Error 1514: Missing Partition Definition