Four ways to start Oracle databases
1, Startup Nomount
Non-installation startup: This way to launch executable: Rebuild the control file, rebuild the database, start the instance, that is, start the SGA and background processes, this startup requires only Init.ora files.
2, startup Mount DBName
Install Startup: This way to start under executable: Database log archiving, database recovery, renaming some database files, such as system table space or log files. Execute "nomount" and then open the control file
3, Startup Open dbname
You can access the data in the database by first executing "nomount" and then executing "mount" and then opening all the database files, including the redo log file.
4, startup equals the following three commands
Startup Nomount
ALTER DATABASE Mount
ALTER DATABASE Open
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