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Troubleshooting ORA-30036 - Unable To Extend Undo Tablespace (Doc ID 460481.1)

Last updated on AUGUST 23, 2023

Applies to:

Oracle Database - Enterprise Edition - Version and later
Information in this document applies to any platform.


Purpose of this document is to have a checklist for troubleshooting ORA-30036 errors i.e unable to extend segment by %s in undo tablespace '%s' when using Automatic Undo Management (AUM). This note will also discuss some known issues on this subject along with the diagnostic information required while raising a Service Request with Oracle Support.

Troubleshooting Steps

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In this Document
Troubleshooting Steps
 When a ORA-30036 will be reported.
Troubleshooting ORA-30036 Errors

 Case 1: No Expired extents available and mostly Active extents present.
 Case 2: No Expired extents available and mostly Unexpired extents present.
 Case 3: Lot of Expired extents are available.
 Known issues
 Diagnostic information to be collected while raising the SR with Oracle Support

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