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Description

MariaDB Error 1737, 'Found a row that does not match the partition', indicates a data integrity violation within a partitioned table. This error occurs when an operation (such as INSERT or UPDATE) attempts to place or move a row into a partition that does not exist or does not align with the table's defined partitioning scheme. It signifies that the data in the row's partition key column(s) is incompatible with the partitioning rules.

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Error Message

Found a row that does not match the partition

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Known Causes

3 known causes

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Invalid Partition Key Value

The value in the column(s) used for partitioning does not map to any defined partition in the table schema, often occurring with out-of-range data.

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Update of Partition Key

An UPDATE statement attempted to change a partition key column's value, resulting in the row no longer fitting its original partition and unable to be moved to a valid new one.

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Missing or Incomplete Partitions

The table's partitioning scheme does not include a partition for the specific data range or value being processed, potentially due to an oversight or evolving data requirements.

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Solutions

3 solutions available

1. Re-evaluate and Correct Partitioning Strategy advanced

This involves a careful review of your table's partitioning definition and the data that is causing the mismatch.

1

Identify the problematic row. This often requires inspecting the data that was recently inserted or updated. You might need to temporarily disable constraints or use `EXPLAIN` on queries that involve partitioned tables to pinpoint the issue.

SELECT * FROM your_table WHERE your_partition_column = 'problematic_value';
-- Or, if the value is unknown, try to find rows that don't fit any partition logic.

2

Analyze your current partitioning definition. Use `SHOW CREATE TABLE your_table;` to see how the table is partitioned. Understand the range, list, or hash functions used. For example, if you have RANGE partitioning on a date column, ensure the inserted date falls within one of the defined ranges.

SHOW CREATE TABLE your_table;

3

Correct the data or the partitioning scheme. If the data is incorrect, update it to fall within an existing partition. If the partitioning scheme is inadequate or has gaps, you'll need to alter the table. This might involve adding new partitions, modifying existing ones, or even re-partitioning the entire table.

-- Example: Adding a new partition (for RANGE partitioning)
ALTER TABLE your_table ADD PARTITION (PARTITION p_new VALUES LESS THAN (date '2024-01-01'));

-- Example: Re-partitioning (requires careful planning and potential downtime)
-- This is a complex operation and may involve creating a new table with the desired partitioning,
-- migrating data, and then switching the tables.

4

After making corrections, re-run the operation that failed. If the problem was due to a specific insert/update, try that operation again.

INSERT INTO your_table (partition_column, other_columns) VALUES ('correct_value', '...');

2. Temporary Data Correction and Re-insertion medium

For transient issues or when direct partition alteration is complex, this method involves isolating and re-inserting problematic data.

1

Identify the specific row(s) causing the mismatch. This is crucial. You might need to analyze logs or use `EXPLAIN` on queries that trigger the error.

SELECT * FROM your_table WHERE ... -- identify the row based on the data that failed to insert/update

2

Create a temporary table to hold the problematic row(s).

CREATE TABLE temp_problem_rows LIKE your_table;
INSERT INTO temp_problem_rows SELECT * FROM your_table WHERE ...; -- Use the same WHERE clause as above

3

Delete the problematic row(s) from the original table.

DELETE FROM your_table WHERE ...; -- Use the same WHERE clause as above

4

Modify the data in the temporary table to ensure it conforms to your partitioning rules. This might involve changing the value of the partitioning column.

UPDATE temp_problem_rows SET partition_column = 'new_valid_value' WHERE ...;

5

Re-insert the corrected data from the temporary table back into the original table.

INSERT INTO your_table SELECT * FROM temp_problem_rows;
DROP TABLE temp_problem_rows;

3. Disable and Re-enable Partitioning (Use with Caution) medium

A quick but potentially disruptive method to reset partitioning state for the table.

1

Back up your data. This is a critical step before attempting to alter partitioning, as it can lead to data loss if not done correctly.

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

2

Alter the table to remove partitioning. This effectively turns it into a non-partitioned table.

ALTER TABLE your_table REMOVE PARTITIONING;

3

Re-create the partitioning on the table. You will need to re-define your partitioning scheme.

ALTER TABLE your_table PARTITION BY ... -- Re-define your partitioning strategy here (e.g., RANGE, LIST, HASH)

4

Attempt the operation that previously failed. If the issue was a transient state or a corruption, this might resolve it.

INSERT INTO your_table (partition_column, other_columns) VALUES (...);

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Related Errors

5 related errors

MariaDB Error 1737: Row Partition Mismatch