MySQL Error 1726: Unsupported Storage Engine for System Tables

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Description

MySQL Error 1726 occurs when an operation attempts to use a storage engine that does not support system tables for a critical database component. This typically happens during server startup, upgrades, or when trying to create/alter internal schema tables using an incompatible engine like MEMORY, CSV, or NDB.

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Error Message

Storage engine '%s' does not support system tables. [%s.%s]

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Known Causes

3 known causes

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Misconfigured Default Storage Engine

The `default_storage_engine` setting in `my.cnf` or `my.ini` is configured to an engine (e.g., MEMORY, CSV) that cannot handle MySQL's internal system tables during initialization or operation.

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Attempted Manual Alteration of System Tables

A user or script explicitly tried to change the storage engine of a table within internal schemas (like `mysql`, `information_schema`, or `performance_schema`) to an unsupported type.

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MySQL Upgrade Incompatibility

During a MySQL server upgrade, if existing configuration or data dictionary entries point to an unsupported engine for core system tables, the upgrade process can fail with this error.

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Solutions

Coming Soon

Detailed 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

Find Help

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Related Errors

5 related errors