ORA-1555 Zero Duration/ ORA-600 [ktbdchk1: bad dscn] / ORA-600 [2663] / after Physical Standby switchover

(Doc ID 1577824.1)

Last updated on JUNE 20, 2018

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.1 to 11.2]
Oracle Database - Enterprise Edition - Version to [Release 12.1]
Information in this document applies to any platform.
***Checked for relevance on 02-Sep-2016***


 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


Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms