ogg抽取进程abend，检查发现备库的日志被删除掉了：

2018-10-11 11:14:52  ERROR   OGG-00446  Could not find archived log for sequence 20064 thread 2 under default destinations SQL  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 20064, archived = 1, use_alternate = 0Not able to establish initia
l position for sequence 20064, rba 235066896.

2018-10-11 11:14:52  ERROR   OGG-01668  PROCESS ABENDING.

到主库拷贝日志：
ASMCMD> cp thread_2_seq_20064.489.989227143 /home/grid/thread_2_seq_20064.489.989227143
copying +arch/chunqiu/ARCHIVELOG/2018_10_11/thread_2_seq_20064.489.989227143 -> /home/grid/thread_2_seq_20064.489.989227143

scp 拷贝到远程的备库上，注册归档：
alter database register logfile '/home/oracle/thread_2_seq_20064.489.989227143';

重新启动抽取进程，正常。

测试日志参考：
1.注册少量的日志：
SQL> alter database register logfile '/home/oracle/thread_2_seq_20064.489.989227143';
2.注册大量的日志
rman> catalog start with '/home/oracle/archlog';