???????dba???????????????????????????????????????????????????????????????????????????????????????????????????2??????3????????????????????????????????????????????????????????
???????????????????????srvctl????
????[oracle@node2]$ srvctl stop instance -d racdb -i racdb1??racdb2 -o immediate
????????????crs??
????[oracle@node2 ~]$ crs_stat -t
????Name           Type           Target    State     Host
????------------------------------------------------------------
????ora....SM2.asm application    ONLINE    ONLINE    node1
????ora....E1.lsnr application    ONLINE    ONLINE    node1
????ora.node1.gsd  application    ONLINE    ONLINE    node1
????ora.node1.ons  application    ONLINE    ONLINE    node1
????ora.node1.vip  application    ONLINE    ONLINE    node1
????ora....SM1.asm application    ONLINE    ONLINE    node2
????ora....E2.lsnr application    ONLINE    ONLINE    node2
????ora.node2.gsd  application    ONLINE    ONLINE    node2
????ora.node2.ons  application    ONLINE    ONLINE    node2
????ora.node2.vip  application    ONLINE    ONLINE    node2
????ora.racdb.db   application    OFFLINE   OFFLINE
????ora....b1.inst application    OFFLINE   OFFLINE
????ora....b2.inst application    OFFLINE   OFFLINE
????????????????nomount??
????[oracle@node2 ~]$ srvctl start database -d racdb  -o nomount
???????????????????
????SQL> select INSTANCE_NAME??HOST_NAME??STATUS from gv$instance;
????INSTANCE_NAME    HOST_NAME            STATUS
????---------------- -------------------- ------------
????racdb1           node2.ocean.com      STARTED
????racdb2           node1.ocean.com      STARTED
?????????????rman???????е?????????????μ???????
????[oracle@node2 ~]$ rman target / nocatalog
????RMAN> restore controlfile to '+DATA/racdb/controlfile/control_2' from '+DATA/racdb/controlfile/current.256.842559447';
????Starting restore at 20-MAR-14
????allocated channel: ORA_DISK_1
????channel ORA_DISK_1: sid=146 instance=racdb1 devtype=DISK
????channel ORA_DISK_1: copied control file copy
????Finished restore at 20-MAR-14
????????????????????????
????SQL> alter system set control_files='+DATA/racdb/controlfile/control_2'??'+DATA/racdb/controlfile/current.256.842559447'
????scope=spfile;
????System altered.
?????塢?????????????control_files?????????????????????????????Ч??
????[oracle@node2 ~]$ srvctl stop instance -d racdb -i racdb1??racdb2 -o immediate
???????????????????
????[oracle@node2 ~]$ srvctl start database -d racdb
?????????????????control_files????
????SQL> show parameter control
????NAME                                 TYPE        VALUE
????------------------------------------ ----------- ------------------------------
????control_file_record_keep_time        integer     7
????control_files                        string      +DATA/racdb/controlfile/contro
????l_2?? +DATA/racdb/controlfile/c
????urrent.256.842559447
????????????????????control_2????????????