How to Quickly Resolve ORA-01775: Looping Chain of Synonyms?

Resolving ORA-01775: Looping Chain of Synonyms

The ORA-01775 error, caused by a looping chain of synonyms, can be frustrating to debug. While "create or replace" can often alleviate the issue, it's not the most efficient solution.

To identify the offending synonyms, you can use the following query:

SELECT name, object_type, referenced_object_name
FROM synonyms
WHERE referenced_owner = SYS
  AND referenced_object_type = 'SYNONYM'
  AND referenced_object_name IN (
    SELECT name
    FROM synonyms
    WHERE referenced_owner = SYS
      AND referenced_object_type = 'SYNONYM'
  )
ORDER BY name;

This query will return a hierarchical view of the synonym chain, allowing you to quickly pinpoint the loop.

Another useful tool is the Oracle SQL Developer GUI. After connecting to the database, navigate to the "Hierarchy Viewer" under the "Tools" menu. In the "Type" dropdown, select "Synonym Hierarchy." This visual representation can help you trace the synonym chain and identify the problem easily.

While preventing looping chains is best practice, occasionally these errors can occur. Using the aforementioned debugging methods can expedite the resolution process, ensuring your database's stability.

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