Detailed analysis of Oracle sqlplus commands

The following articles mainly describe the Oracle sqlplus command in detail, including the description of the actual content of Oracle Database startup and shutdown, what we need to do when the Oracle system is started or shut down in a dual-host environment.

I. Oracle startup and Shutdown

1. to enable or disable the Oracle System in a single-host environment, you must first switch to the Oracle user, as shown below:

 
 

  
  
su - Oracle  
 
 

A. Start the Oracle System

 
 

  
  
Oracle >svrmgrl  
  
  
SVRMGR>connect internal  
  
  
SVRMGR>startup  
  
  
SVRMGR>quit  
 
 

B. Disable the Oracle system.

 
 

  
  
Oracle >svrmgrl  
  
  
SVRMGR>connect internal  
  
  
SVRMGR>shutdown  
  
  
SVRMGR>quit  
 
 

Run the following command to start the Oracle 9i Database:

 
 

  
  
$ sqlplus /nolog  
  
  
SQL*Plus: Release 9.2.0.1.0 - Production on Fri Oct 31 13:53:53 2003  
  
  
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.  
  
  
SQL> connect / as sysdba  
  
  
Connected to an idle instance.  
  
  
SQL> startup^C  
  
  
SQL> startup  
  
  
Oracle instance started.  
 
 

2. to enable or disable the Oracle System in a dual-host environment, you must first switch to the root user, as shown below:

 
 

  
  
su － root 
 
 

A. Start the Oracle System

 
 

  
  
hareg －y Oracle  
 
 

B. Disable the Oracle system.

 
 

  
  
hareg －n Oracle  
 
 

Oracle Database startup Methods

Note:

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

6. startup force

Forced start method: bitsCN.com China Network Management Alliance

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 adminoradbpfileinit.ora 
 
 

8. startup EXCLUSIVE

The above content is a detailed description of the Oracle sqlplus command, hoping to provide you with some help in this regard.