Create standby controlfile

oracle@anuj> sqlplus / as sysdba

SQL*Plus: Release 10.2.0.4.0 - Production on Fri Aug 6 13:22:27 2010

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Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

oracle@anuj>ALTER DATABASE CREATE STANDBY CONTROLFILE AS '/tmp/controlfile.ctl';

Database altered