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ORACLE AWR: order of SNAP_ID after upgrade from 12c to 19c

edited Jun 19, 2020 3:06AM in Database Administration (MOSC) 2 commentsAnswered ✓

Hi ,

we have successfully upgraded one of our test databases from Oracle 12c (12.2.0.1) to Oracle 19c (19.7.0.0). Everything works fine - even the main application using this database runs successfully without any issues so far.

But we recognized that the SNAP_ID of table DBA_HIST_SNAPSHOT is out of order:

select snap_id, BEGIN_INTERVAL_TIME,END_INTERVAL_TIME from DBA_HIST_SNAPSHOT order by BEGIN_INTERVAL_TIME ;            

  SNAP_ID BEGIN_INTERVAL_TIME               END_INTERVAL_TIME

--------- --------------------------------- ------------------------------------

    56938 18-MAY-20 07.50.29.811000000 AM   18-MAY-20 08.00.31.461000000 AM  

    56939 18-MAY-20 08.00.31.461000000 AM   18-MAY-20 08.10.33.305000000 AM  

    56940 18-MAY-20 08.10.33.305000000 AM   18-MAY-20 08.20.35.002000000 AM  

    56941 18-MAY-20 08.20.35.002000000 AM   18-MAY-20 08.30.36.648000000 AM  

             507 10-JUN-20 08.19.56.000000000 AM   10-JUN-20 08.30.23.270000000 AM     /* Date of upgrade */

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