Oracle Database startup and shutdown methods!

There are several startup methods:

1. startup nomount

Non-installation startup. In this mode, you can execute: re-build the control file and re-build the database.

Read the init. ora file and start the instance, that is, start the SGA and background processes. To start the process, you only need the init. ora file.

2. startup Mount dbname

Install and start. In this mode, run:

Database Log archiving,

Database media recovery,

Online or offline data files,

Locate the data file and redo the log file.

Execute "nomount", open the control file, and confirm the location of the data file and the on-line log file,

However, data files and log files are not verified at this time.

3. startup open dbname

Run "nomount" first, then "Mount", and then open all database files including the redo log file,

In this way, you can access data in the database.

4. startup, which is equal to the following three commands

Startup nomount

Alter database Mount

Alter database open

5. startup restrict

Constraint-based startup

This method can start the database, but only allow access by users with certain privileges

When a non-authorized user accesses the service, the following prompt is displayed:

Error:

ORA-01035: Oracle only allows users with restricted session permissions to use 6, startup force

Force start Mode

When the database cannot be closed, you can use startup force to close the database.

Shut down the database first, and then execute the normal database startup command

7. startup pfile = parameter file name

Startup method with initialization parameter file

Read the parameter file first, and then start the database according to the settings in the parameter file.

Example: startup pfile = E:/Oracle/admin/oradb/pfile/init. ora

8. startup exclusive

There are three methods to disable the service:

1. Shutdown normal

Close the database normally.

2. Shutdown immediate

Close the database immediately.

Run shutdown immediate in svrmgrl, and the database is not closed immediately,

However, it is disabled only after Oracle executes some cleanup tasks (terminating sessions and releasing session resources ),

When you use shutdown to close a database, shutdown immediate can be used to close the database.

3. Shutdown abort

Directly shut down the database, and the session accessing the database will be suddenly terminated,

If a large number of operations are being performed in the database, it takes a long time to restart the database after the shutdown abort command is executed.