Asynch CDC: Delete old archived redo logs

Uli Bethke October 9, 2008

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 SELECT cap.CAPTURE_NAME, cap.FIRST_SCN, cap.APPLIED_SCN, cap.REQUIRED_CHECKPOINT_SCN FROM DBA_CAPTURE cap, CHANGE_SETS cset WHERE cap.CAPTURE_NAME = cset.CAPTURE_NAME 1234567 SELECTcap.CAPTURE_NAME,cap.FIRST_SCN,cap.APPLIED_SCN,cap.REQUIRED_CHECKPOINT_SCNFROM DBA_CAPTURE cap, CHANGE_SETS csetWHERE cap.CAPTURE_NAME ...

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Asynch CDC: Waiting For Dictionary Redo

Uli Bethke October 8, 2008

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 dbms_capture_adm.build does not match the first_scn when creating the change source on the downstream server. You need to ...

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