Asynch CDC: Delete old archived redo logs

Uli Bethke Oracle

The following steps need to be taken to be able to delete archived redo logs that are no longer required by the CDC capture process: 1. Determine the new first_scn for your capture process

As per Oracle documentation: This query "determines a new first_scn value that is greater than the original first_scn value and less than or equal to ...

Asynch CDC: Waiting For Dictionary Redo

Uli Bethke Oracle

I have come across (so far) four scenarios that show capture process "hanging" as WAITING FOR DICTIONARY REDO. 1. Wrong first_scn supplied for create_autolog_change_source: The first_scn when building the the data dictionary in the redo log via does not match the first_scn when creating the change source on the downstream server. You need to supply the first_scn of the ...