场景
ogg 所有Extract 进程起不起来，一直挂载中，查看日志，报错如下
2019-08-26T14:13:12.177+0800 ERROR OGG-00868 Oracle GoldenGate Capture for Oracle, e_xxl3.prm: Gap found in DDL metadata records.
2019-08-26T14:13:12.182+0800 ERROR OGG-00508 Oracle GoldenGate Capture for Oracle, e_xxl3.prm: Fragment number gap detected (faulty data) in DDL object versioning table, fragment #3 for SCN , query [SELECT metadata_text, fragmentNo, optime FROM ogg_admin.GGS_DDL_HIST WHERE seqno = (SELECT MAX(seqno) FROM ogg_admin.GGS_DDL_HIST WHERE objectid = (SELECT objectId FROM ogg_admin.GGS_DDL_HIST_ALT WHERE altObjectId = :object_id AND rownum=1) AND startSCN = (SELECT MAX (startSCN) FROM ogg_admin.GGS_DDL_HIST WHERE objectid = (SELECT objectId FROM ogg_admin.GGS_DDL_HIST_ALT WHERE altObjectId = :object_id AND rownum=1))) ORDER BY fragmentNo ].
2019-08-26T14:13:12.182+0800 ERROR OGG-01668 Oracle GoldenGate Capture for Oracle, e_xxl3.prm: PROCESS ABENDING.
- 思路
上面报错大概意思就是在历史表中找不到scn对应的片段，就是中间有数据丢失了
解决过程
- 查看日志的scn号
select GROUP#,sequence#,STATUS,FIRST_CHANGE#,to_char(FIRST_TIME,‘yyyy/mm/dd:hh24:mi:ss’) firsttime,NEXT_CHANGE#,to_char(NEXT_TIME,‘yyyy/mm/dd:hh24:mi:ss’) nexttime from V$log;
- view report E_CC
对比两个scn号,发现进程里记录的scn与日志里查到的差别很大，就是有很多数据丢失了
