Different ways of Starting Up a Database

Options for Starting Up a Database
1)Starting Up a Database Using SQL*Plus
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$sqlplus /nolog
SQL>conn / as sysdba
SQL>startup

2)Starting Up a Database Using Recovery Manager
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a)oracle@neptune:~$ rman target /
Recovery Manager: Release 10.2.0.1.0 - Production on Tue Apr 15 18:08:04 2008
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connected to target database (not started)
b)RMAN> startup
Oracle instance started
database mounted
database opened
3)Starting Up a Database Using Oracle Enterprise Manager
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a)emctl start dbconsole
b)paste the url in to the browser.
c)Enter host credential and database credential as sysdba.