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SQL>

Starts an Oracle instance with several options, including mounting,
and opening a database.

STARTUP options | upgrade_options

where options has the following syntax:
[FORCE] [RESTRICT] [PFILE=filename] [QUIET] [ MOUNT [dbname] |
[ OPEN [open_options] [dbname] ] |
NOMOUNT ]

where open_options has the following syntax:
READ {ONLY | WRITE [RECOVER]} | RECOVER

and where upgrade_options has the following syntax:
[PFILE=filename] {UPGRADE | DOWNGRADE} [QUIET]