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Primary Note: Troubleshooting ORA-1548 error (Doc ID 1577988.1)

Last updated on JANUARY 29, 2022

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Information in this document applies to any platform.



This troubleshooting guide is for resolving ORA-1548 error reported while dropping UNDO tablespace.

The main purpose is to provide the Database Administrators an understanding of the issue and steps to resolve the same. It also provides you the diagnostic information to be collected before raising a Service Request with Oracle Support.

Troubleshooting Steps

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In this Document
Troubleshooting Steps
 What is ORA-1548
  Case 1 : An active or dead transaction present in the Undo Segment.
 Case 2: Undo segment held by a dead distributed transaction
 Case 3: When Undo Segment requires recovery
 Case 4: If Event 10513 is set.
 Case 5: When FlashBack Data Archiver (FBDA) is enabled
 Case 6: FlashBack Data Archiver (FBDA) was enabled in the past.
 Diagnostic Information to be Collected While Raising a Service Request.

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