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 <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 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';
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