ORA-00600: internal error code, arguments: [ktbdchk1: bad dscn]

Cause: This Errors May Occur after a switchover Physical Standby database, and it is due to Oracle Bug 8895202. 

Solution:  Apply the patch where this issue is fixed , Patch 8895202 or Patch Sets >= 11.2.0.2 or Patch Bundles >= 11.1.0.7. If Your database version is >=11.2.0.2 then just change the parameter _ktb_debug_flags to 8. There is no danger in keeping _ktb_debug_flags=8. It gets only activated by invalid scn in itl.

After change the parameter analyze the object which has been affected.

bash-4.3$ sqlplus "/as sysdba"

SQL*Plus: Release 11.2.0.4.0 Production on Tue Sep 26 14:31:11 2017

Copyright (c) 1982, 2013, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, Oracle Label Security,
OLAP, Data Mining, Oracle Database Vault and Real Application Testing options

SQL> alter system set "_ktb_debug_flags"=8 scope=both sid='*';

System altered.

SQL> EXIT
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, Oracle Label Security,
OLAP, Data Mining, Oracle Database Vault and Real Application Testing options
bash-4.3$
bash-4.3$



ORA-01555 caused by SQL statement below (SQL ID: 89w0nk4mvs89k, Query Duration=0 sec, SCN: 0x0b0e.183c53aa):

Dump continued from file: /u01/app/oracle/diag/rdbms/erpdcdb/erpdcdb1/trace/erpdcdb1_ora_7798850.trc
ORA-00600: internal error code, arguments: [ktbdchk1: bad dscn], [], [], [], [], [], [], [], [], [], [], []

========= Dump for incident 5041023 (ORA 600 [ktbdchk1: bad dscn]) ========
----- Beginning of Customized Incident Dump(s) -----
[ktbdchk] -- ktbgcl4 -- bad dscn
dependent scn: 0x0b0e.6ada21f5 recent scn: 0x0b0e.183bdd5c current scn: 0x0b0e.183bdd5c
----- End of Customized Incident Dump(s) -----

ANALYZE TABLE TABLE_NAME VALIDATE STRUCTURE CASCADE;

Dump continued from file: /u01/app/oracle/diag/rdbms/erpdcdb/erpdcdb2/trace/erpdcdb2_ora_5767956.trc
ORA-00600: internal error code, arguments: [2663], [2830], [698760342], [2830], [1792623805], [], [], [], [], [], [], []

========= Dump for incident 2720876 (ORA 600 [2663]) ========

*** 2017-09-26 13:52:19.908
dbkedDefDump(): Starting incident default dumps (flags=0x2, level=3, mask=0x0)
----- Current SQL Statement for this session (sql_id=2pbup9vshvk0u) -----
ANALYZE TABLE TABLE_NAME VALIDATE STRUCTURE CASCADE;