oracle goldengate先从online log日志抽取数据，然后才会从archived log中进行抽取，这可以通过下面的方式来验证.
- 1、主库端插入测试数据
- SQL> insert into gg1.dept values(81,'1','1');
- 1 row created.
- SQL> commit;
- Commit complete.
- SQL> alter system switch logfile;
- System altered.
- SQL> insert into gg1.dept values(82,'2','2');
- 1 row created.
- SQL> commit;
- Commit complete.
- SQL> insert into gg1.dept values(83,'3','3');
- 1 row created.
- SQL> commit;
- Commit complete.
- SQL> alter system switch logfile;
- System altered.
- SQL> insert into gg1.dept values(84,'4','4');
- 1 row created.
- SQL> commit;
- Commit complete.
- 在这里多次执行alter system switch logfile;
- 这里比较关键，在后面我们会删除， 82、83对应的归档日志， 如果没有覆盖掉82、83对应的online log，goldengate的extract进程不会异常中止，extract进程会优选online log。
- 2、在这里我们覆盖掉online log,然后删除82、83对应的归档日志。
- 3、查看goldengate状态，extract进程异常中止
- GGSCI (slav2) 1> info all
- Program Status Group Lag Time Since Chkpt
- MANAGER RUNNING
- EXTRACT RUNNING D1PUMP 00:00:00 00:00:02
- EXTRACT ABENDED EXT1 00:03:10 00:02:29
- GGSCI (slav2) 2> info ext1
- EXTRACT EXT1 Last Started 2013-01-21 22:15 Status ABENDED
- Checkpoint Lag 00:03:10 (updated 00:02:33 ago)
- Log Read Checkpoint Oracle Redo Logs
- 2013-01-21 22:11:50 Seqno 28, RBA 67584
- [oracle@slav2 ggs]$ vi ggserr.log
- 2013-01-21 22:14:59 INFO OGG-00975 Oracle GoldenGate Manager for Oracle, mgr.prm: EXTRACT EXT1 starting.
- 2013-01-21 22:14:59 INFO OGG-00992 Oracle GoldenGate Capture for Oracle, ext1.prm: EXTRACT EXT1 starting.
- 2013-01-21 22:15:00 WARNING OGG-01423 Oracle GoldenGate Capture for Oracle, ext1.prm: No valid default archive log destination directory found for thread 1.
- 2013-01-21 22:15:00 INFO OGG-01513 Oracle GoldenGate Capture for Oracle, ext1.prm: Positioning to Sequence 28, RBA 67088.
- 2013-01-21 22:15:00 INFO OGG-01516 Oracle GoldenGate Capture for Oracle, ext1.prm: Positioned to Sequence 28, RBA 67088, Jan 21, 2013 10:11:50 PM.
- 2013-01-21 22:15:00 INFO OGG-00993 Oracle GoldenGate Capture for Oracle, ext1.prm: EXTRACT EXT1 started.
- 2013-01-21 22:15:00 INFO OGG-01055 Oracle GoldenGate Capture for Oracle, ext1.prm: Recovery initialization completed for target file /u01/app/ggs/dirdat/lt000004, at RBA 1672.
- 2013-01-21 22:15:00 INFO OGG-01478 Oracle GoldenGate Capture for Oracle, ext1.prm: Output file /u01/app/ggs/dirdat/lt is using format RELEASE 10.4/11.1.
- 2013-01-21 22:15:00 INFO OGG-01026 Oracle GoldenGate Capture for Oracle, ext1.prm: Rolling over remote file /u01/app/ggs/dirdat/lt000004.
- 2013-01-21 22:15:00 INFO OGG-01053 Oracle GoldenGate Capture for Oracle, ext1.prm: Recovery completed for target file /u01/app/ggs/dirdat/lt000005, at RBA 968.
- 2013-01-21 22:15:00 INFO OGG-01057 Oracle GoldenGate Capture for Oracle, ext1.prm: Recovery completed for all targets.
- 2013-01-21 22:15:00 INFO OGG-01517 Oracle GoldenGate Capture for Oracle, ext1.prm: Position of first record processed Sequence 28, RBA 67088, SCN 0.610617, Jan 21, 2013 10:11:50 PM.
- 4、从备库copy丢失的归档日志，重新启动extract进程;如果归档日志找不回来，执行下面的操作，会丢失该归档中的数据，操作完后需要补丢失的数据。
- GGSCI (slav2) 3> alter extract ext1,extseqno 30,extrba 0 --重置seqno和rba
- EXTRACT altered.
- GGSCI (slav2) 4> start extract ext1
- Sending START request to MANAGER ...
- EXTRACT EXT1 starting
- GGSCI (slav2) 5> info all
- Program Status Group Lag Time Since Chkpt
- MANAGER RUNNING
- EXTRACT RUNNING D1PUMP 00:00:00 00:00:02
- EXTRACT RUNNING EXT1 00:00:00 00:00:06
- GGSCI (slav2) 6> info ext1
- EXTRACT EXT1 Last Started 2013-01-21 22:22 Status RUNNING
- Checkpoint Lag 00:00:00 (updated 00:00:08 ago)
- Log Read Checkpoint Oracle Redo Logs
- First Record Seqno 30, RBA 0
- GGSCI (slav2) 7> info ext1
- EXTRACT EXT1 Last Started 2013-01-21 22:22 Status RUNNING
- Checkpoint Lag 00:00:00 (updated 00:00:00 ago)
- Log Read Checkpoint Oracle Redo Logs
- 2013-01-21 22:22:59 Seqno 39, RBA 13473280
- 5、验证，30号归档（包括30号）以后的数据成功同步
