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單實例數據庫多日志線程，搭建ogg,啟動抽取進程時提示一下錯誤：
ERROR OGG-00446 Oracle GoldenGate Capture for Oracle, extjms.prm: The number of Oracle redo threads (2) is not the same as the number of checkpoint threads (1). EXTRACT groups on RAC systems should be created with the THREADS parameter (e.g., ADD EXT <group name>, TRANLOG, THREADS 2, BEGIN...).
BECAUSE:which GoldenGate thread number corresponds to the Oracle redo threads, use the output from v$log,my oracle have two redo threads and goldengate configue one extract group;
解決有兩種：
一、刪除oracle日志線程2
SQL> alter database disable thread 2;
Database altered.
SQL> alter database drop logfile group 3;
Database altered.
SQL> alter database drop logfile group 4;
Database altered.
二、增加線程2的抽取進程
GGSCI (host01) > Add Extract extjms2, TranLog,threads 2, Begin Now
GGSCI (host01) > Add ExtTrail ./dirdat/js, Extract extjms, Megabytes 50
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