3390
MySQLERRORNotableAccess ControlHIGH confidence
Role cycle detected in the role hierarchy
Production Risk
Low — GRANT fails; no cycle is created.
How to reproduce
trigger — this will error
trigger — this will error
-- Detected during GRANT ROLE that would complete a cycle.
expected output
ERROR 3390 (HY000): Role cycle detected.
Fix
Revoke one grant to break the cycle
Revoke one grant to break the cycle
REVOKE role_b FROM role_a;
Why this works
Removing one edge in the role graph eliminates the cycle.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 3390 ER_ROLE_CYCLES_DETECTED
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