Informix Error -757: File open for light append can't pseudo close.

Reasons / Common Causes

-757 is flagged by the official text as an internal error, with no documented application-level trigger — a file opened for "light append" (a fast-path bulk-insert append mode) couldn't complete the internal "pseudo close" step the server uses at that point in its processing.

1. A genuine internal engine condition during a light-append operation's internal close handling, per the official guidance's framing, with no other documented application-level cause.
2. A bulk-load/append operation interrupted unexpectedly (a connection drop, a server condition) partway through, plausible given the "light append" context even though not explicitly named by the sparse 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 bulk-load/append operation in progress at the time of the failure, for escalation, given the light-append context named in the error text itself.
3. Retry the append operation, as a practical first step, in case the condition was transient (for example, tied to a momentary interruption) rather than persistently reproducible.

Examples

Capturing circumstances for escalation

-- Record the exact bulk-load/append operation and target table in
-- progress when -757 occurred, for escalation.

Diagnostic Checks

1. Retry the operation as a first step.
2. Capture the exact append operation and target table for escalation if it recurs.

Related Errors / Related Topics

No closely related error codes are cross-referenced for -757 in this set yet.

An internal error tied to the "light append" fast bulk-insert path — retry first, then capture details for escalation if it recurs.