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Informix Error -12063: Smart Large Objects: Cannot update SB_LOHD_SLOT.

Cause and resolution

Smart Large Objects: Cannot update SB_LOHD_SLOT.

Cannot read smart-large-object header page for smart large object. Cannot update smart-large-object header page for smart large object.

Oninit® Troubleshooting Guidance

Reasons / Common Causes

-12063 fires when the server can't read or update a smart large object's header page — per the official guidance.

  1. A failure reading the smart-large-object header page, per the official guidance — the first named case.
  2. A failure updating the smart-large-object header page, per the official guidance — the second named case.
Solutions / Resolution
  1. If this error recurs, note all circumstances and contact IBM Informix Technical Support, per the official guidance's general pattern for this error family.
Examples
N/A

No specific triggering statement is documented beyond a header-page read/update failure.

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
  • -12027 — "Smart Large Objects: Cannot delete SB_LOHD_SLOT." A related LO-header-slot error, on deleting rather than updating.
  • -12033 — "Smart Large Objects: Cannot insert SB_LOHD_SLOT." A related LO-header-slot error, on inserting rather than updating.

The LO header page couldn't be read or updated — report recurrences to IBM Informix Technical Support.