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ORA-1555 Zero Duration/ ORA-600 [ktbdchk1: bad dscn] / ORA-600 [2663] / after Physical Standby switchover (Doc ID 1577824.1)

Last updated on FEBRUARY 02, 2022

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.1 to 11.2]
Oracle Database - Enterprise Edition - Version to [Release 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Information in this document applies to any platform.


 The Following Errors May Occur in a Physical Standby database after a switchover :

ORA-1555 With Query Duration=0
ORA-600 [ktbdchk1: bad dscn]
ORA-600 [2663]

Sometimes the following errors are also reported


ORA-00700: soft internal error, arguments: [EVENT_CREATED_INCIDENT], [1555]


Also With the fix of Bug 7517208 which is included by default in Patch Set and versions >= (Base Release), the DBVERIFY utility reports this SCN inconsistency with error:

itl[<itl_id>] has higher commit scn(aaaa.bbbb) than block scn (xxxx.yyyy)
Page <Block#> failed with check code 6056

There is NO DATA CORRUPTION in the block , The DBVERIFY utility falsely reports SCN corruption.


 Physical Standby switchover


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