ORA-600 [5463] While SMON is Doing Temporary Segment Drop

(Doc ID 422039.1)

Last updated on OCTOBER 19, 2017

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 9.2 to 12.1]
Information in this document applies to any platform.
Checked for relevance on 01-Nov-2010


When starting the database after a crash or for normal maintenance after a truncate table, the error below will occur 100 times and then the instance will crash. 

The errors are caused because SMON is trying to clean a temp segment in a tablespace by looking at the bitmap index in the tablespace.  The bitmap index is corrupted and this causes SMON to fail when trying to clean up the segment.

From the alert.log:

ORA-00600: internal error code, arguments: [5463], [], [], [], [], [], [], []
Non-fatal internal error happenned while SMON was doing temporary segment drop.
SMON encountered 53 out of maximum 100 non-fatal internal errors.


The issue occurred after a table was truncated with drop storage option.

ORA-00600: internal error code, arguments: [5463], [], [], [], [], [], [], []
Current SQL statement for this session:


Another possible error which can be encountered is:

ORA-00600: internal error code, arguments: [ktecgeb-2], [1], [0], [], [], [], [], [], [], [], [], []


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