Error
Error Code:
1747
MariaDB Error 1747: Invalid Partition Clause Use
Description
This error signifies an attempt to execute a Data Definition Language (DDL) statement that includes a `PARTITION ()` clause on a table that has not been defined as partitioned. It occurs when operations specific to managing table partitions are applied to a standard, unpartitioned table, indicating a mismatch between the intended operation and the table's actual structure.
Error Message
PARTITION () clause on non partitioned table
Known Causes
4 known causesApplying Partition Operations to Unpartitioned Table
This is the most common cause, occurring when a user tries to add, drop, or reorganize partitions on a table that was not created with a `PARTITION BY` clause.
Misunderstanding Table Partitioning Status
The user might mistakenly assume a table is partitioned, leading to the inclusion of partition-specific syntax in DDL statements for an unpartitioned table.
Incorrect DDL Statement Syntax
A `PARTITION` clause might be inadvertently included in an `ALTER TABLE` statement when it's not required or applicable for the intended modification on a non-partitioned table.
Reusing Partitioned Table Scripts
Executing SQL scripts designed for partitioned tables against unpartitioned tables can trigger this error if the scripts contain partition-specific DDL commands.
Solutions
3 solutions available1. Remove Partition Clause from Non-Partitioned Table Operations easy
Identify and remove the PARTITION() clause from SQL statements affecting non-partitioned tables.
1
Review the SQL statement that is causing the error. This could be an INSERT, UPDATE, DELETE, SELECT, or ALTER TABLE statement.
2
Locate the `PARTITION (...)` or `PARTITION FOR (...)` clause within the statement.
Example of problematic clause: PARTITION(p1)3
Remove this `PARTITION (...)` clause from the SQL statement.
Corrected statement (example): INSERT INTO my_table (col1, col2) VALUES (val1, val2);4
Re-execute the corrected SQL statement.
2. Create Partitioning for a Table Intending to Use Partition Clauses medium
If partitioning is intended, define it on the table before using partition clauses.
1
Verify if the table `your_table_name` is indeed intended to be partitioned. You can check its current definition with:
SHOW CREATE TABLE your_table_name;2
If the table is not partitioned and you want to partition it, you'll need to define a partitioning scheme. This involves choosing a partitioning type (e.g., RANGE, LIST, HASH, KEY) and defining the partitioning columns and sub-partitions if applicable. Here's an example for RANGE partitioning on a date column:
ALTER TABLE your_table_name
PARTITION BY RANGE (TO_DAYS(your_date_column))
(PARTITION p0 VALUES LESS THAN (TO_DAYS('2023-01-01')),
PARTITION p1 VALUES LESS THAN (TO_DAYS('2024-01-01')),
PARTITION p2 VALUES LESS THAN MAXVALUE);
3
After successfully creating the partitions, re-execute the original SQL statement that was failing. The `PARTITION (...)` clause should now be valid.
3. Identify and Correct Application Code Generating Partition Clauses advanced
Debug your application code to find where partition clauses are being incorrectly generated for non-partitioned tables.
1
Examine your application's codebase, specifically any modules or functions that construct SQL queries for MariaDB. This is common in ORMs or custom query builders.
2
Look for conditional logic that might be attempting to add `PARTITION (...)` clauses based on incorrect assumptions or configurations. For example, an application might assume a table is partitioned when it's not.
3
Implement checks within your application code to determine if a table is partitioned before attempting to use partition-specific syntax. You can query the `information_schema.PARTITIONS` table for this.
SELECT COUNT(*) FROM information_schema.PARTITIONS WHERE TABLE_SCHEMA = 'your_database_name' AND TABLE_NAME = 'your_table_name';4
Modify your application logic to either omit partition clauses for non-partitioned tables or to dynamically create partitions if that's the desired behavior and is supported by your application's design.