Informix Error -597: [Internal] Premature End Of Buffer.

Reasons / Common Causes

-597 is flagged by the official text (and by its own [Internal] tag) as an internal error, with no documented application-level trigger — a buffer the server expected to contain more data ended sooner than expected during some internal processing step.

1. A genuine internal engine condition, per the official guidance's framing, with no documented application-level cause.
2. An oversized or unusually complex statement (a very long SPL routine body, a deeply nested expression, an extremely large IN list) that stresses an internal buffer near its limits, plausible given the "premature end of buffer" framing even though not explicitly named by the official text.
3. A client/server or preprocessor/library version mismatch, similar in spirit to the -516/-588 family, producing malformed internal protocol data that a buffer-parsing step then chokes on.

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. Try simplifying or shortening the statement that triggered it, as a practical workaround worth attempting given the "buffer" framing, if an unusually large or complex statement was involved — split it into smaller pieces if possible.
3. Check client/server and preprocessor/library version compatibility, similar to the -516/-588 pattern, as a plausible concrete check before treating this as purely internal.

Examples

Capturing circumstances for escalation

-- Record the exact statement (especially if unusually large/complex),
-- and the client driver/server versions in use, for escalation.

Diagnostic Checks

1. Check whether an unusually large or complex statement was involved, and try simplifying it as a practical first step.
2. Check client/server version compatibility as a secondary check.
3. Capture full circumstances for escalation if neither explains it.

Related Errors / Related Topics

No closely related error codes are cross-referenced for -597 in this set yet.

An internal buffer-handling error — try simplifying an unusually large/complex statement first, then check version compatibility, before escalating to IBM Informix Technical Support.