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Informix Error -12138: Smart Large Objects: Attempt to open an LO with light I/O and byte range locking.

Cause and resolution

Smart Large Objects: Attempt to open an LO with light I/O and byte range locking.

At open time, you specified an unsupported combination of options. Byte-range locking is not supported with light I/O. Check your program and remove one of the blob open flags (MI_LO_NOBUFFER flag or MI_LO_LOCKRANGE flag).

Oninit® Troubleshooting Guidance

Reasons / Common Causes

-12138 fires when an open call combines light I/O with byte-range locking — per the official guidance.

  1. MI_LO_NOBUFFER and MI_LO_LOCKRANGE both set on the same open call, per the official guidance — the direct, only cause; byte-range locking isn't supported with light I/O.
Solutions / Resolution
  1. Remove one of the two open flags (MI_LO_NOBUFFER or MI_LO_LOCKRANGE), per the official guidance.
Examples
N/A

No specific triggering statement is documented beyond combining light I/O with byte-range locking.

Diagnostic Checks
  1. Check the open flags passed, and confirm MI_LO_NOBUFFER and MI_LO_LOCKRANGE aren't both set.
Related Errors / Related Topics
  • -12126 — "Smart Large Objects: LO is not opened for byte range locking." A related byte-range-locking error, about the wrong lock mode being set rather than an unsupported flag combination.

Light I/O and byte-range locking were combined on the same open call, which isn't supported — remove one of the two flags.