ALTER PLUGGABLE DATABASE Fails with ORA-00604/ORA-00001: unique constraint (SYS.I_PDB_ALERT1) violated/ORA-1405: fetched column value is NULL (Doc ID 2523458.1)

Last updated on APRIL 17, 2023

Applies to:

Symptoms

Opening a PDB fails with the following errors:
  ORA-00604: error occurred at recursive SQL level 1
  ORA-00001: unique constraint (SYS.I_PDB_ALERT1) violated

The alert log showed an ORA-1405

Changes

 APEX was upgraded.  Although the product wouldn't necessarily need to be APEX, the issues reported for this error so far have been associated with having installed/upgraded APEX in a PDB.   In this case, the failing SQL is 'select version from registry$ where status not in (9, 99) and namespace='SERVER' and cid='APEX', so APEX is the option causing the issue in the PDB.

Cause

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