Oracle Database startup Methods

How many Oracle Database startup methods do you know? There are four answers. there are four Oracle Database startup methods. Please refer to the first one: startup nomount non-installation startup: This method can be executed under startup: rebuilding the control file, rebuilding the database, and starting the instance, that is, to start the SGA and background processes, this kind of startup only requires init. ora file. Www.2cto.com type 2: startup mount dbname installation start: In this mode, you can run: Database Log archiving, database recovery (Oracle training), and naming some database files, such as system tablespace or log files. Execute "nomount", and then open the control file. The third type is startup open dbname. First, execute "nomount", and then execute "mount ", then open the rare database files, including the Redo log files, to access the data in the secondary database. Www.2cto.com type 4: startup equals to the following three calls (1) startup nomount (2) alter database mount (3) alter database open