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Informix Error -460

-460 Statement length exceeds maximum.

The statement text in this PREPARE, DECLARE, or EXECUTE IMMEDIATE statement is longer than the database server can handle. The actual limit differs with different implementations, but it is always generous, in most cases up to 65,535 characters. Review the program logic to ensure that an error has not caused it to present a string that is longer than intended (for example, by overlaying the null string terminator byte in memory). If the text has the intended length, revise the program to present fewer statements at a time.

Oninit® Troubleshooting Guidance

Reasons / Common Causes

-460 fires when a dynamically constructed statement text — used with PREPARE, DECLARE, or EXECUTE IMMEDIATE — exceeds the server's maximum statement length, typically up to 65,535 characters depending on the specific implementation.

  1. A genuinely very large dynamically-generated statement — e.g. a bulk INSERT with an enormous number of VALUES tuples concatenated into one string.
  2. A missing null terminator in a C string, causing the client library to read past the intended end of the statement text and treat garbage memory as additional statement content — an unintentional oversized string.
  3. A string-building bug that duplicates or repeats content unexpectedly, inflating the statement text well beyond what was actually intended.
Solutions / Resolution
  1. Review program logic for unintended oversized strings, per the official guidance — check specifically for a missing null terminator, which is a common root cause of an unintentionally huge statement.
  2. If the length is genuinely intentional, break the statement into smaller chunks — for bulk inserts, batch them into multiple smaller statements rather than one enormous one.
  3. Check the actual constructed statement length at runtime before passing it to PREPARE/ EXECUTE IMMEDIATE, to catch the problem before it reaches the server.
Examples
Checking for a missing null terminator
/* Confirm the buffer holding the dynamically built statement
   text is properly null-terminated — an unterminated buffer can
   cause the client library to read far more "statement text"
   than was actually intended. */
Batching a large bulk insert into smaller statements
-- Instead of one enormous INSERT with thousands of VALUES tuples,
-- batch them into multiple smaller statements, each within the
-- server's maximum statement length.
Diagnostic Checks
  1. Measure the actual length of the constructed statement text at the point it's passed to PREPARE/DECLARE/EXECUTE IMMEDIATE.
  2. Check for a missing null terminator or a string-building bug producing unintended, duplicated, or excessive content.
  3. Confirm the server's actual maximum statement length for the specific implementation in use, since it varies.
Related Errors / Related Topics
  • -410 — "Prepare statement failed or was not executed." A related dynamic-SQL error, about PREPARE/EXECUTE sequencing rather than statement length.

Check for a missing null terminator first if the statement length is unexpectedly large — that's a more common root cause than a genuinely oversized intentional statement.