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Informix Error -12021: Smart Large Objects: Duplicate keys not allowed.

Cause and resolution

Smart Large Objects: Duplicate keys not allowed.

If this error recurs, note all circumstances and contact IBM Informix Technical Support.

Oninit® Troubleshooting Guidance

Reasons / Common Causes

-12021 is an internal error — per the official guidance, no user-facing cause is documented beyond an attempted duplicate key insertion into an internal structure.

  1. An internal attempt to insert a duplicate key, per the official guidance — no further detail given.
Solutions / Resolution
  1. If this error recurs, note all circumstances and contact IBM Informix Technical Support, per the official guidance.
Examples
N/A

No specific triggering statement is documented — this is reported as an internal error.

Diagnostic Checks
  1. Escalate to IBM Informix Technical Support if the error recurs — this is an internal error with no documented user-actionable cause.
Related Errors / Related Topics
  • -12022 — "Smart Large Objects: Duplicate entry in chunk adjtab." The same class of internal duplicate-key error, specific to the chunk adjacency table.

An internal duplicate-key insertion was attempted — report recurrences to IBM Informix Technical Support.