报错：
ERROR OGG-00730 No minimum supplemental logging is enabled. This may cause extract process to handle key update incorrectly if key column is not in first row piece.
发现数据库不是最细log模式，查看:
SQL> select supplemental_log_data_min from v$database;
SUPPLEME
--------
NO
修正：
SQL> alter database add supplemental log data;
Database altered.
SQL> alter system switch logfile;
System altered.
重启extract又错：
ERROR OGG-00717 Found unsupported in-memory undo record in sequence 20, at RBA 1137168,
with SCN 0.1181993 (1181993) ... Minimum supplemental logging must be enabled to prevent data loss.
解决： 重新alter
extract extb1, tranlog, begin now
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