環境：參考：OGG學習筆記02-單向複製配置實例
實驗目的：瞭解OGG簡單故障的基本處理思路。
1. 故障現象
故障現象：啓動OGG源端的extract進程，data pump進程，一段時間後發現進程均被終止。
GGSCI (oradb30) 1> info all
Program Status Group Lag at Chkpt Time Since Chkpt
MANAGER RUNNING
EXTRACT ABENDED LPJY1 00:00:00 47:39:54
EXTRACT ABENDED LXJY1 00:00:00 47:40:00
GGSCI (oradb30) 2> start extract lxjy1
Sending START request to MANAGER ...
EXTRACT LXJY1 starting
GGSCI (oradb30) 3> info all
Program Status Group Lag at Chkpt Time Since Chkpt
MANAGER RUNNING
EXTRACT ABENDED LPJY1 00:00:00 47:40:50
EXTRACT RUNNING LXJY1 00:00:00 47:40:55
GGSCI (oradb30) 4> start extract lpjy1
Sending START request to MANAGER ...
EXTRACT LPJY1 starting
GGSCI (oradb30) 5> info all
Program Status Group Lag at Chkpt Time Since Chkpt
MANAGER RUNNING
EXTRACT RUNNING LPJY1 00:00:00 47:40:58
EXTRACT RUNNING LXJY1 00:00:00 47:41:04
GGSCI (oradb30) 6> info all
Program Status Group Lag at Chkpt Time Since Chkpt
MANAGER RUNNING
EXTRACT ABENDED LPJY1 00:00:00 47:41:15
EXTRACT RUNNING LXJY1 00:00:00 47:41:21
GGSCI (oradb30) 7> info all
Program Status Group Lag at Chkpt Time Since Chkpt
MANAGER RUNNING
EXTRACT ABENDED LPJY1 00:00:00 47:41:19
EXTRACT RUNNING LXJY1 00:00:00 47:41:25
GGSCI (oradb30) 8> info all
Program Status Group Lag at Chkpt Time Since Chkpt
MANAGER RUNNING
EXTRACT ABENDED LPJY1 00:00:00 47:41:41
EXTRACT ABENDED LXJY1 00:00:00 47:41:47
2. 查看日誌
查看ogg日誌ggserr.log, 排查進程被終止的原因。
[ogg@oradb30 ogg]$ cd $GG_HOME
[ogg@oradb30 ogg]$ tail -200f ggserr.log
發現datapump進程lpjy1是因爲連接不到目標OGG而終止；extract進程lxjy1是因爲無法找到歸檔日誌sequence 160 thread 1而終止。
2017-01-19 14:51:46 INFO OGG-00993 Oracle GoldenGate Capture for Oracle, lpjy1.prm: EXTRACT LPJY1 started.
2017-01-19 14:51:49 ERROR OGG-01224 Oracle GoldenGate Capture for Oracle, lpjy1.prm: TCP/IP error 113 (No route to host).
2017-01-19 14:51:49 ERROR OGG-01668 Oracle GoldenGate Capture for Oracle, lpjy1.prm: PROCESS ABENDING.
2017-01-19 14:52:28 ERROR OGG-00446 Oracle GoldenGate Capture for Oracle, lxjy1.prm: Could not find archived log for sequence 160 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 160, archived = 1, use_alternate = 0Not able to establish initial position for sequence 160, rba 7758352.
2017-01-19 14:52:28 ERROR OGG-01668 Oracle GoldenGate Capture for Oracle, lxjy1.prm: PROCESS ABENDING.
排查原因發現是歸檔日誌被RMAN備份策略備份完成後刪除了，既然有備份，那麼下一步只需要從備份集中恢復日誌中提示的sequence 160及其之後的日誌即可。
這裏，也說明配置OGG最好建議是歸檔模式，否則在這種目標端沒有及時獲取到源端在線日誌的情況下，就沒有辦法繼續應用了。
3. 解決問題
對於lxjy1進程（Extract），只需要從RMAN備份集中恢復sequence 160及其之後的歸檔日誌：
$ rman target /
RMAN> restore archivelog from logseq 160;
然後再啓動lxjy1進程。
對於lpjy1進程（Data Pump），只需要確認已經啓動目標端OGG所在主機，網通，然後啓動目標端數據庫和目標OGG，並啓動目標OGG的mgr進程，replicat進程即可。
最終確認源端和目標端ogg所有進程均正常running：
源端OGG：
GGSCI (oradb30) 1> info all
Program Status Group Lag at Chkpt Time Since Chkpt
MANAGER RUNNING
EXTRACT RUNNING LPJY1 00:00:00 00:00:03
EXTRACT RUNNING LXJY1 00:00:00 00:00:00
目標端OGG：
GGSCI (oradb31) 1> info all
Program Status Group Lag at Chkpt Time Since Chkpt
MANAGER RUNNING
REPLICAT RUNNING RJY1 00:00:00 00:00:01