Informix Error -665: Internal error on semantics - code-number.

Reasons / Common Causes

-665 is flagged by the official text as an internal error in the semantic-analysis phase of statement processing, with no documented application-level trigger beyond the numbered code-number the message carries.

1. A genuine internal engine condition in semantic analysis, per the official guidance's framing, with no documented application-level cause.
2. An unusually complex or edge-case statement (deep nesting, an uncommon combination of SQL features) that stresses the semantic analyzer in a way ordinary statements don't, plausible given the "semantics" framing even though not explicitly named by the official text.

Solutions / Resolution

1. If this recurs, note all circumstances and contact IBM Informix Technical Support, per the official guidance — there is no documented general application-level fix.
2. Capture the specific code-number reported in the message, since that number likely maps to a specific internal condition IBM/HCL support can identify directly.
3. Try simplifying or restructuring the statement that triggered it, as a practical workaround worth attempting if an unusually complex or edge-case statement was involved.

Examples

Capturing circumstances for escalation

-- Record the exact statement and the specific code-number reported
-- alongside "Internal error on semantics" for escalation.

Diagnostic Checks

1. Capture the specific code-number and the exact failing statement for escalation.
2. Try simplifying the statement if it's unusually complex, as a practical first step.

Related Errors / Related Topics

No closely related error codes are cross-referenced for -665 in this set yet.

Capture the specific code-number the message reports — it likely identifies the exact internal condition for IBM/HCL support, more precisely than the generic message text alone.