EC
1679
MySQLERRORCommonInternalHIGH confidence

Internal error

Production Risk

High — internal errors may indicate data corruption or server instability.

What this means

MySQL encountered an unexpected internal error. The error message typically includes more detail about the subsystem that failed.

Why it happens
  1. 1A bug in the MySQL server triggered an unhandled internal condition.
  2. 2Corrupted in-memory structures caused an internal assertion failure.
  3. 3An unsupported combination of operations triggered an unhandled code path.
How to reproduce
trigger — this will error
trigger — this will error
-- Varies; typically triggered by edge cases or bugs

expected output

ERROR 1679 (HY000): Internal error: <description>

Fix 1

Check the MySQL error log for details

Check the MySQL error log for details
SHOW VARIABLES LIKE 'log_error';
-- Read the error log file for stack trace or assertion details

Why this works

The error log provides the specific internal condition that triggered the error.

Fix 2

Upgrade to the latest MySQL patch release

Upgrade to the latest MySQL patch release
-- Check MySQL release notes for fixes related to the reported internal error

Why this works

Many internal errors are bugs fixed in later patch releases.

Sources
Official documentation ↗

MySQL 8.0 — 1679 ER_INTERNAL_ERROR

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