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Informix Error -12028: Smart Large Objects: Cannot delete SB_LOMAP_SLOT.

Cause and resolution

Smart Large Objects: Cannot delete SB_LOMAP_SLOT.

You cannot delete an extent map for a smart large object. Ensure that the chunk is accessible. If this error recurs, note all circumstances and contact IBM Informix Technical Support.

Oninit® Troubleshooting Guidance

Reasons / Common Causes

-12028 fires when an extent map for a smart large object can't be deleted — per the official guidance.

  1. The chunk being inaccessible, per the official guidance — the named, likely cause.
Solutions / Resolution
  1. Ensure the chunk is accessible, per the official guidance.
  2. 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 beyond deleting an extent map on an inaccessible chunk.

Diagnostic Checks
  1. Check the chunk's accessibility before retrying the extent-map delete.
Related Errors / Related Topics
  • -12026 — "Smart Large Objects: Cannot delete smart large object." The general form of this same class of delete failure.
  • -12027 — "Smart Large Objects: Cannot delete SB_LOHD_SLOT." The same class of delete failure, on the LO header slot rather than the extent map slot.
  • -12029 — "Smart Large Objects: Cannot delete SB_USERDATA_SLOT." The same class of delete failure, on the user data slot rather than the extent map slot.

An extent map couldn't be deleted, likely due to an inaccessible chunk — check chunk accessibility.