原因是extract 所需的archived log已经被清走，不在log_archive_dest指定的目录下，解决方法很简单，只要把sequence 从10770开始
今天启动一个extract时，，出现以下错误：
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 , 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已经被清走，不在log_archive_dest指定的目录下，解决方法很简单，只要把sequence 从10770开始到当前的archived log重新拷贝回log_archive_dest目录下即可。
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