Error
Error Code:
1212
MariaDB Error 1212: MERGE Table Database Mismatch
Description
This error indicates that you are attempting to create or modify a MERGE table whose underlying component tables are located in different databases. MariaDB requires all tables combined into a single MERGE table to reside within the same database instance and directory structure.
Error Message
Incorrect table definition; all MERGE tables must be in the same database
Known Causes
4 known causesComponent Tables in Different Databases
The `UNION` clause of the MERGE table definition explicitly specifies component tables that belong to separate databases, which is not permitted.
Incorrect Database Specification
Accidentally referencing tables from a different database in the `UNION` clause when defining the MERGE table, even if the intention was to use tables from the current database.
Database Migration or Renaming
If underlying tables were moved to a different database or databases were renamed without updating the MERGE table definition, leading to a location mismatch.
Fully Qualified Names Across Databases
Using `database_name.table_name` syntax for component tables where `database_name` differs from the MERGE table's database, violating the same-database rule.
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