oracle rac切换到单实例DG后OGG的处理

在RAC切换到单实例DG后，将OGG目录复制过去，在使用alter extract ext_name,begin now的时候报错

2016-04-10 11:27:03 WARNING OGG-01423 Oracle GoldenGate Capture for Oracle, cknm2bet.prm: No valid default archive log destination directory found
2016-04-10 11:27:03 INFO OGG-00546 Oracle GoldenGate Capture for Oracle, cknm2bet.prm: Default thread stack size: 10485760.
2016-04-10 11:27:03 ERROR OGG-00446 Oracle GoldenGate Capture for Oracle, cknm2bet.prm: The number of Oracle redo threads (2) is not the same
2016-04-10 11:27:03 ERROR OGG-01668 Oracle GoldenGate Capture for Oracle, cknm2bet.prm: PROCESS ABENDING.

原因是以前是RAC，因此有两个thread，产生的redo是两个，现在是单实例，只有一个thread，只是产生一个redo

解决方法：

select THREAD#, STATUS , ENABLED , SEQUENCE#, to_char(LAST_REDO_TIME,'dd-mon-yy hh24:mi:ss') from v$thread;

   THREAD# STATUS ENABLED   SEQUENCE# TO_CHAR(LAST_REDO_TIME,'DD-
---------- ------ -------- ---------- ---------------------------
         1 OPEN   PUBLIC           62 17-apr-20 17:11:21
         2 CLOSED PUBLIC           38 15-apr-20 15:00:42

select THREAD#,GROUP#,SEQUENCE#,MEMBERS,status from v$log order by SEQUENCE#;

   THREAD#     GROUP#  SEQUENCE#    MEMBERS STATUS
---------- ---------- ---------- ---------- ----------------
         2          4          0          1 UNUSED
         2          3         38          1 INACTIVE
         1          2         61          1 INACTIVE
         1          1         62          1 CURRENT

禁用thread2
alter database disable thread 2;

删除thread2的logfile（unused）
alter database drop logfile group 4;

alter database drop logfile group 3;

ggsc> alter extract ext_name, thread 1, extseqno 547, extrba 0;