Error
Error Code:
1749
MariaDB Error 1749: Missing Table Partition
Description
This error signifies that an operation attempted to interact with a specific data partition within a table, but the referenced partition named '%s' could not be found. It typically occurs during DDL operations like `ALTER TABLE ... DROP PARTITION` or DML operations that explicitly target a non-existent partition.
Error Message
partition '%s' doesn't exist
Known Causes
3 known causesTypo in Partition Name
The partition name specified in the SQL statement contains a typo or does not exactly match an existing partition for the target table.
Partition Previously Dropped
The partition you are trying to access or modify has already been removed from the table by a prior database operation.
Table Not Partitioned as Expected
The table in question is not partitioned, or it uses a different partitioning scheme than what the current operation expects.
Solutions
4 solutions available1. Verify Partition Name and Table Definition easy
Double-check the partition name against the table's actual partition structure.
1
Identify the table and the partition name mentioned in the error message. The `%s` in the error message will be replaced with the actual partition name.
2
Query the `information_schema.PARTITIONS` table to get the correct list of partitions for the affected table.
SELECT PARTITION_NAME FROM information_schema.PARTITIONS WHERE TABLE_SCHEMA = 'your_database_name' AND TABLE_NAME = 'your_table_name';3
Compare the partition name from the error message with the `PARTITION_NAME` column returned by the query. If there's a typo or the partition doesn't exist, correct your query or operation.
2. Recreate Missing Partition medium
If a partition is genuinely missing, recreate it using ALTER TABLE.
1
Confirm that the partition is indeed missing by querying `information_schema.PARTITIONS` as described in the previous solution.
SELECT PARTITION_NAME FROM information_schema.PARTITIONS WHERE TABLE_SCHEMA = 'your_database_name' AND TABLE_NAME = 'your_table_name' AND PARTITION_NAME = 'partition_name_from_error';2
If the query returns no rows, the partition is missing. You will need to recreate it. This requires knowing the partitioning scheme of your table (e.g., RANGE, LIST). Consult your table's `CREATE TABLE` statement or `SHOW CREATE TABLE your_table_name;`.
3
Use `ALTER TABLE` to add the missing partition. The exact syntax depends on your partitioning type and values. For example, for a RANGE partition:
ALTER TABLE your_table_name ADD PARTITION (PARTITION partition_name_from_error VALUES LESS THAN (value));4
If it's a LIST partition, the syntax would be different, e.g.:
ALTER TABLE your_table_name ADD PARTITION (PARTITION partition_name_from_error VALUES IN (value1, value2));5
After recreating the partition, retry the operation that caused the error.
3. Review and Correct Application/Script Logic medium
Ensure that the application or script is referencing the correct partition names.
1
Examine the code (SQL queries, stored procedures, application logic) that is performing operations on the partitioned table. Look for any hardcoded partition names or dynamic generation of partition names.
2
Verify that the partition names used in the code exactly match the actual partition names defined in the table's schema. Pay close attention to case sensitivity if applicable.
3
If the code dynamically generates partition names, ensure the logic is correct and that it accounts for all existing partitions. Consider using `information_schema.PARTITIONS` to dynamically fetch partition names if necessary.
4
Test the corrected code or script to confirm that it now references existing partitions correctly.
4. Address Inconsistent Partition States (Advanced) advanced
Investigate and resolve potential inconsistencies in how partitions are managed, especially in complex setups.
1
This error can sometimes occur if there are inconsistencies between the table's metadata and its actual data files, or if partitions were dropped/added outside of standard `ALTER TABLE` commands.
2
Check the MariaDB error logs for any related errors that might indicate underlying issues with partition management. The error log location is typically specified in your `my.cnf` or `my.ini` file.
3
If you suspect data file corruption or severe metadata inconsistencies, consider performing a `REPAIR TABLE your_table_name;` operation. This can sometimes help to resynchronize metadata.
REPAIR TABLE your_table_name;4
In extreme cases, and with caution, you might need to consider a more involved process like exporting the table data, dropping the table, and recreating it with the correct partitioning scheme, then importing the data. This is a disruptive process and should be planned carefully with backups.