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ORA-12545: Connect failed because target host or object does not exist

What it means

The host name in the connect descriptor cannot be resolved or is wrong.

How to fix it

Fix the host name or use the IP; check DNS/hosts file.

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.