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MySQL 1223: Partition key was not found.

When encountering the error 1223: Partition key was not found in MySQL, you can take the following immediate action:

  1. Identify the Table and Query Causing the Error:


- If the error message does not specify the table, review your recent queries to identify the one that caused the error.

  1. Check for the Existence of the Partition Key in the Table Schema:


SHOW CREATE TABLE yourtablename;
Replace `yourtablename` with the name of the table you were trying to query or modify. This command shows the table creation SQL, including the partitioning key if it exists. Look for the `PARTITION BY` clause to identify the partition key.

  1. Verify the Data Type and Value of the Partition Key:


- Ensure that the value you are using to query or insert into the partitioned table matches the data type and constraints of the partition key as defined in the table schema. Misalignment in data types or attempting to insert values that don't match any partition can lead to this error.

  1. Review Partition Definitions:


SELECT PARTITIONNAME, PARTITIONEXPRESSION, PARTITIONDESCRIPTION, TABLEROWS
FROM INFORMATION_SCHEMA.PARTITIONS
WHERE TABLE
SCHEMA = 'yourdatabasename' AND TABLENAME = 'yourtablename';
Replace `yourdatabasename` and `yourtablename` with your specific database and table names. This query helps you understand how the table is partitioned, including the partition key and range or list values defined for each partition.

  1. Check the Query Against the Partition Key:


- Ensure that the operation you're trying to perform (SELECT, INSERT, UPDATE, etc.) includes the partition key in the WHERE clause (for SELECT, UPDATE, DELETE) or that the inserted/updated data includes values for the partition key that correspond to existing partitions.

  1. If Necessary, Adjust the Query or Data:


- Based on your findings from the steps above, adjust your query to ensure it properly references the partition key and matches the expected data types and values that correspond to existing partitions.

  1. Consider Reorganizing Partitions if Needed:


If your investigation reveals that the necessary partition does not exist for the data you are working with, and it's appropriate based on your use case, consider reorganizing your partitions to accommodate the data. This step should be taken with caution and ideally after consulting MySQL's documentation or an experienced DBA, as it involves altering the table structure.

These steps should help identify and potentially resolve the error 1223: Partition key was not found in MySQL.

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