Error
Error Code:
1509
MariaDB Error 1509: Coalesce Only HASH/KEY Partitions
Description
This error indicates an attempt to use the `ALTER TABLE ... COALESCE PARTITION` statement on a table that is partitioned by a method other than `HASH` or `KEY`. The `COALESCE PARTITION` operation is specifically designed for reducing the number of partitions in `HASH` or `KEY` partitioned tables, and will fail on `RANGE` or `LIST` partitions.
Error Message
COALESCE PARTITION can only be used on HASH/KEY partitions
Known Causes
3 known causesAttempting to Coalesce Range or List Partitions
The `COALESCE PARTITION` statement is not supported for tables partitioned using `RANGE` or `LIST` methods, as it is exclusively for `HASH` and `KEY` partitioning.
Incorrect Partitioning Scheme for Operation
The database design or a specific `ALTER TABLE` command might be trying to apply `COALESCE PARTITION` to a table whose partitioning method does not logically align with this operation.
Misunderstanding of COALESCE PARTITION Functionality
Users unfamiliar with MariaDB's partitioning capabilities might mistakenly apply `COALESCE PARTITION` to any partitioned table, not realizing its specific limitation.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service