********************* ATTENTION: ********************
The controlfile header block returned by the OS
has a sequence number that is too old.
The controlfile might be corrupted.
PLEASE DO NOT ATTEMPT TO START UP THE INSTANCE
without following the steps below.
RE-STARTING THE INSTANCE CAN CAUSE SERIOUS DAMAGE
TO THE DATABASE, if the controlfile is truly corrupted.
In order to re-start the instance safely,
please do the following:
(1) Save all copies of the controlfile for later
     analysis and contact your OS vendor and Oracle support.
(2) Mount the instance and issue:
     ALTER DATABASE BACKUP CONTROLFILE TO TRACE;
(3) Unmount the instance.
(4) Use the script. in the trace file to
     RE-CREATE THE CONTROLFILE and open the database.
*****************************************************
Instance terminated by ARC0, pid = 2080

1,看了10g data guard官方文档，讲述只要主库控制文件损坏或者找不到，主库会自动down库，我在rhel上面，mv了所有控制文件，主库仍旧运行如初
2,我继续坚持，不死心，不断mv控制文件，主库看来发火了，主动down库,上为摘录一节alert,供后记

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oracle10g data guard(dg)_主库控制文件受损或loss_自动关库测试

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