OGG-00446 ERROR: Could not find archived log

今天啟動一個extract時，出現以下錯誤：

2011-10-16 22:41:02  ERROR   OGG-00446  Oracle GoldenGate Capture for Oracle, e430rks2.prm:  Could not find archived log for sequence 10770 thread 1 under default destinations SQL <SELECT  name    FROM v$archived_log   WHERE sequence# = :ora_seq_no AND         thread# = :ora_thread AND         resetlogs_id = :ora_resetlog_id AND         archived = 'YES' AND         deleted = 'NO>, error retrieving redo file name for sequence 10770, archived = 1, use_alternate = 0Not able to establish initial position for sequence 10770, rba 78960656.
2011-10-16 22:41:02  ERROR   OGG-01668  Oracle GoldenGate Capture for Oracle, e430rks2.prm:  PROCESS ABENDING.

原因是extract 所需的archived log已經被清走，不在log_archive_dest指定的目錄下，解決方案很簡單，只要把sequence 從10770開始到當前的archived log重新拷貝回log_archive_dest目錄下即可。