TIPS: Start and close an Oracle database

Oracle Database startup and shutdown Methods

I. Several startup methods:

1. startup nomount is not installed and started. In this mode, execute the following commands: re-build the control file and re-build the database.

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

2. startup mount dbname

Install and start. In this mode, you can execute: Database Log archiving, database recovery, and renaming some database files.

Execute "nomount" and open the control file.

3. startup open dbname: Execute "nomount", then "mount", and then open all database files including Redo log files,

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 Constraints

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

6. startup force

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

Ii. Closing methods:

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.