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ORA-01489: Result of string concatenation is too long
What it means
A concatenation in SQL exceeds 4000 bytes (VARCHAR2 limit with STANDARD string size), often with LISTAGG or ||.
How to fix it
Use LISTAGG ... ON OVERFLOW TRUNCATE (12.2+), XMLAGG/JSON_ARRAYAGG with CLOB, or TO_CLOB on the first operand.
Catch it before it runs
ORA Error Helper
Explains ORA-/PLS- codes inside JetBrains IDEs and DataGrip. PL/SQL Lint
Flags risky PL/SQL patterns while you type. Oracle Plan Reader
Reads execution plans and points at the slow step. PL/SQL in Practice
Kindle book with practical PL/SQL for working developers.
Explains ORA-/PLS- codes inside JetBrains IDEs and DataGrip. PL/SQL Lint
Flags risky PL/SQL patterns while you type. Oracle Plan Reader
Reads execution plans and points at the slow step. PL/SQL in Practice
Kindle book with practical PL/SQL for working developers.
Nearby errors
Updated 2026-11-12.