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Orphaned Lobs after marking LOB column unused (Doc ID 461651.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 9.2.0.1 to 11.1.0.6 [Release 9.2 to 11.1]
Oracle Database - Enterprise Edition - Version 12.2.0.1 to 12.2.0.1 [Release 12.2]
Information in this document applies to any platform.
***Checked for relevance on 22-Sep-2016***
This problem can occur on any platform.

Symptoms

There are LOB segments listed in DBA_SEGMENTS and DBA_OBJECTS but not in DBA_LOBS and they occupy space in the database:


SQL> SELECT * FROM DBA_LOBS WHERE SEGMENT_NAME IN ('SYS_LOB0000053185C00002$$');

no rows selected

SQL> SELECT OBJECT_NAME FROM DBA_OBJECTS WHERE OBJECT_NAME IN ('SYS_LOB0000053185C00002$$');

SYS_LOB0000053185C00002$$

Cause

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