刚装好的GG抽取进程报OGG-00685 错误 求助大神的帮助，谢谢！

Question

刚装好的gg，源端系统平台为AIX 6.1

数据库版本为11.2.0.3 RAC环境
添加完抽取进程报错如下：

2012-12-14 17:12:44 ERROR OGG-00685 begin time Dec 14, 2012 5:09:51 PM prior to oldest log in log h
istory. Last SQL executed ERE first_time _change_number AND >.

抽取进程配置如下：
EXTRACT lzcq1
setenv ( NLS_LANG = "AMERICAN_AMERICA.ZHS16GBK")
USERID ggsa, Password oracle
TRANLOGOPTIONS EXCLUDEUSER ggsa
tranlogoptions altarchivedlogformat instance lzsiora1 %t_%s_%r.dbf
tranlogoptions altarchivedlogformat instance lzsiora2 %t_%s_%r.dbf
tranlogoptions altarchivelogdest primary instance lzsiora1 +ORCH/LZSIORA/archivelog,altarchivelogdest instance lzsiora2 +ORCH/LZSIORA/archivelog
EXTTRAIL ./dirdat/si
THREADOPTIONS MAXCOMMITPROPAGATIONDELAY 30000
obey ./dirprm/table.txt

不知是什么原因？？？大家有没有遇到过这种情况，请指教！！非常感谢！