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ORA-20000: User-defined application error (ORA-20000..-20999)

What it means

Raised by application code with RAISE_APPLICATION_ERROR; the text is written by the developer, not by Oracle.

How to fix it

Read the message text and the ORA-06512 lines below it to find the raising code.

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.

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Updated 2026-11-12.