归档备份被删，GoldenGate无法抽取数据

发生错误如下，源端EXTRACT进程异常中止，查看日志，发现如下错误。

2014-07-23 01:32:13  ERROR   OGG-00446  Oracle GoldenGate Capture for Oracle, ext_mkt.prm:  Could not find archived log for sequence 74730 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' AND         name not like '+%'         AND standby_dest = 'NO' >, error retrieving redo file name for sequence 74730, archived = 1, use_alternate = 0Not able to establish initial position for sequence 74730, rba 32190992.

到归档目录查看序列号为74730的归档已经被删除，

解决办法：

从备份文件恢复归档

restore archivelog low logseq 74730;