Specifies that RMAN should recover the standby database after creating it.
If DORECOVER is
specified, then RMAN also recovers the database. The standby database is left mounted after duplication is complete.
RMAN
leaves the standby database mounted after media recovery is complete, but does not place the standby database in manual or managed recovery mode. After RMAN creates the standby database, you must resolve any gap sequence before placing it in manual or managed
recovery mode, or opening it in read-only mode.
注意点：
在磁盘io不是瓶颈时，一定要考虑下网络带宽；
根据网络带宽，rman 估算综合评估备份时间
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使用 rman duplicate from active database 搭建dataguard 手记
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