Informix Error -480

Reasons / Common Causes

-480 is the naming-collision counterpart of -469: ALLOCATE DESCRIPTOR requires a unique name within the session, and the name given is already in use by an existing, currently-allocated descriptor.

1. A repeated ALLOCATE DESCRIPTOR call using the same name, without an intervening DEALLOCATE DESCRIPTOR — the most common cause, often from a loop or retry logic that allocates without ever deallocating.
2. A hardcoded descriptor name reused across independent code paths within the same session, colliding when both paths execute.
3. Error-handling logic that retries ALLOCATE DESCRIPTOR after a failure without first deallocating the partially-allocated descriptor from the earlier attempt.

Solutions / Resolution

1. Change the descriptor name to make it unique, per the official guidance, then re-execute the statement.
2. Deallocate the existing descriptor first (DEALLOCATE DESCRIPTOR) if the intent was actually to reuse the name after finishing with the prior allocation.
3. For loops/retries, ensure each iteration deallocates its descriptor before the next allocation, or generate unique names per iteration if concurrent descriptors are genuinely needed.

Examples

Deallocating before reallocating with the same name

ALLOCATE DESCRIPTOR 'desc1';
-- ... use desc1 ...
DEALLOCATE DESCRIPTOR 'desc1';
ALLOCATE DESCRIPTOR 'desc1';
-- succeeds: desc1 was properly deallocated first

The disallowed direct re-allocation

ALLOCATE DESCRIPTOR 'desc1';
ALLOCATE DESCRIPTOR 'desc1';
-- -480: desc1 is already allocated

Diagnostic Checks

1. Check whether the descriptor name was already allocated earlier in the session without an intervening DEALLOCATE DESCRIPTOR.
2. Review loop/retry logic for a missing deallocation step between iterations.

Related Errors / Related Topics

• -469 — "This descriptor does not exist." The mirror-image error — this fires when a descriptor name is referenced but never allocated; -480 fires when attempting to allocate a name that's already in use.
• -316 — "Index index-name already exists in database." A conceptually similar naming- collision restriction, in the index-naming context instead.

Deallocate an existing descriptor before reusing its name — a loop or retry pattern that allocates without ever deallocating is the most common way to hit this.