ORA-00955: Name is already used by an existing object even though object does not exist in all_constraints (Doc ID 2797651.1)

Last updated on JULY 20, 2024

Applies to:

Symptoms

A primary key constraint from a table was dropped and tried to be recreated but the error below occurred:

ORA-00955: name is already used by an existing object

For example:

ALTER TABLE < table name> ADD CONSTRAINT <new_constraint> PRIMARY KEY (instance_id,ais_user,server,port)

Checking all_constraints does not return row:
select * from all_constraints where constraint_name ='<new_constraint>';

Cause

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