Oracle several startup modes & query startup status ____oracle

Oracle Database several startup ways

1, startup Nomount;

Non-installation startup, this way to start executable: Rebuild control files, rebuild the database, read Init.ora files, start 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 media recovery, bringing data files online or offline, relocating data files, redo log files.

Perform "Nomount" first, then open the control file to confirm the location of the data file and the online log file, but do not check the data files and log files at this time.

3, startup open (dbname);

You can access the data in the database by 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;

To View the Oracle startup status :

Sql> select status from V$instance; (Showdown | Nomount | Mount | Open