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

(Doc ID 1577824.1)

Last updated on JANUARY 19, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.1.0.7 to 11.2.0.1 [Release 11.1 to 11.2]
Oracle Database - Enterprise Edition - Version 12.1.0.2 to 12.1.0.2 [Release 12.1]
Information in this document applies to any platform.
***Checked for relevance on 02-Sep-2016***

Symptoms

 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 10.2.0.5 Patch Set and versions >= 11.2.0.1 (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.

Changes

 Physical Standby switchover

Cause

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