Removing Oracle from UNIX
Completely
remove 10g Database and Software from UNIX (Note:275493.1)
Oracle Universal Installer - Version: 10.1.0.2 to 10.1.0.2
Oracle Server - Enterprise Edition - Version: 10.1.0.2 to 10.1.0.2
Solaris Operating System (SPARC 64-bit)
Linux x86
HP-UX PA-RISC (64-bit)
HP Tru64 UNIX
HP-UX Itanium
IBM S/390 Based Linux
AIX5L Based Systems (64-bit)
Red Hat Advanced Server
Linux Itanium
Red Hat Enterprise Linux Advanced Server
To completely remove all Oracle databases, instances, and software
from an Oracle home directory, you must:
Identifying All
Instances
To identify all instances associated with the Oracle home that you
want to remove, enter one of the following commands:
Solaris:
$ more /var/opt/oracle/oratab
Other operating systems:
$ more /etc/oratab
The output for this command contains entries similar to the
following:
+ASM:/u01/app/oracle/product/10.1.0/db_1:N
CUST:/u01/app/oracle/product/10.1.0/db_1:N
These entries show that the +ASM Automatic Storage Manager
instance and the CUST Oracle database instance are associated with
the /u01/app/oracle/product/10.1.0/db_1 Oracle home directory.
Removing an Oracle Database
To completely remove Oracle Database software, you must remove any
installed databases. To remove an Oracle database:
Note: Removing an Oracle database deletes all of the data in
the database. If you want to keep this data, make sure that you
back up the database before deleting it.
Log in as the oracle user:
$ su - oracle
Run the oraenv or coraenv script to set the environment for the
database that you want to remove, for example:
Bourne, Bash, or Korn shell:
$ . /usr/local/bin/oraenv
C shell:
% source /usr/local/bin/coraenv
At the prompt, specify the SID for the database that you want to
remove.
Start the Database Configuration Assistant (DBCA):
$ dbca
The Welcome window appears.
Click Next.
The Operations window appears.
Select Delete a Database, then click Next.
Select the database that you want to delete, then click Finish.
In the window that appears, confirm that you want to delete the
database.
When the DBCA removes the database, you are prompted to choose
whether you want to perform another operation. Click Yes to return
to the Operations screen or click No to exit from DBCA. If you
want to remove another database, click Yes and repeat steps 6 to
8.
Removing
an
ASM Instance
To completely remove Oracle database software, you must also
remove any ASM instances running in the Oracle home. To remove an
ASM instance:
If necessary, log in as the oracle user:
$ su - oracle
Run the oraenv or coraenv script to set the environment for the
ASM instance that you want to remove, for example:
Bourne, Bash, or Korn shell:
$ . /usr/local/bin/oraenv
C shell:
$ source /usr/local/bin/coraenv
At the prompt, specify the SID for the ASM instance that you want
to remove.
Connect to the ASM instance as the SYS user:
$ sqlplus "SYS/SYS_PASSWORD AS SYSDBA"
Enter the following command to determine whether any Oracle
database instance is using the ASM instance:
SQL> SELECT INSTANCE_NAME FROM V$ASM_CLIENT;
This command lists all of the database instances that are using
this ASM instance.
Note: This command only lists database instances that are
running. It is possible that other instances are associated with
the ASM instance, but they are not currently running. If you
removed a database from this Oracle home but the output from the
command shows that this ASM instance is supporting a database
instance in another Oracle home, do not remove the ASM instance
or the Oracle home.
If there are no database instances associated with this ASM
instance, drop the disk group associated with this instance as
follows:
Note: Dropping the ASM disk group makes the disk device
available for use with another ASM instance if required.
However, all data in the disk group is lost. Make sure that no
other database instance requires any data from this disk group
before you drop it.
Identify the disk groups associated with the ASM instance:
SQL> SELECT NAME FROM V$ASM_DISKGROUP;
For each disk group that you want to delete, enter a command
similar to the following:
SQL> DROP DISKGROUP name INCLUDING CONTENTS;
Enter the following command to shut down the ASM instance:
SQL> SHUTDOWN
Remove the entry for the ASM instance from the /etc/oratab file
(or from the /var/opt/oracle/oratab file on Solaris).
Reconfiguring Oracle Cluster
Synchronization Services
Oracle Cluster Synchronization Services (CSS) is a daemon process
that is configured by the root.sh script when you install Oracle
Database 10g for the first time. It is configured to start every
time the system boots. This daemon process is required to enable
synchronization between Oracle ASM and database instances. It must
be running if an Oracle database is using ASM for database file
storage.
Note: On cluster systems with Oracle Real Application Clusters
(RAC) installations, the CSS daemon is configured during the
Oracle Cluster Ready Services (CRS) installation. If the system
is running Oracle CRS, see the Oracle Real Application Clusters
Installation and Configuration Guide for information about
removing RAC or CRS.
Before you remove an Oracle Database 10g Oracle home, you must
determine whether the CSS daemon is running from that Oracle home
and whether any other Oracle Database 10g Oracle homes exist on
the system:
If the Oracle Database 10g Oracle home that you want to remove is
the only Oracle Database 10g installation on the system, you can delete
the
CSS daemon configuration.
If the CSS daemon is running from the Oracle Database 10g Oracle
home that you want to remove and other Oracle Database 10g
installations exist on the system, you must reconfigure
the
CSS daemon to run from another Oracle Database 10g Oracle
home.
The following subsections describe how to complete these tasks.
Identifying Oracle Database 10g Oracle Homes
To identify all of the Oracle Database 10g Oracle home
directories, enter one of the following commands:
Solaris:
$ more /var/opt/oracle/oratab
Other operating systems:
$ more /etc/oratab
From the output, identify any Oracle home directories where Oracle
Database 10g is installed. Oracle homes that contain Oracle
Database 10g typically have paths similar to the following.
However, they might use different paths.
/mount_point/app/oracle/product/10.1.0/db_n
If there is only one Oracle home directory that contains Oracle
Database 10g, see the "Deleting the Oracle CSS Daemon
Configuration" section for information about deleting the Oracle
CSS daemon configuration.
If you identify more than one Oracle Database 10g Oracle home
directory, see the following section for information about
reconfiguring the Oracle CSS daemon.
Reconfiguring the Oracle CSS Daemon
To reconfigure the Oracle CSS daemon so that it runs from an
Oracle home that you are not removing, follow these steps:
In all Oracle home directories on the system, stop all Oracle ASM
instances and any Oracle Database instances that use ASM for
database file storage.
Switch user to root.
Depending on your operating system, enter one of the following
commands to identify the Oracle home directory being used to run
the CSS daemon:
AIX and Linux:
# more /etc/oracle/ocr.loc
Other operating systems:
# more /var/opt/oracle/ocr.loc
The output from this command is similar to the following:
ocrconfig_loc=/u01/app/oracle/product/10.1.0/db_1/cdata/localhost/local.ocr
local_only=TRUE
The ocrconfig_loc parameter specifies the location of the Oracle
Cluster Registry (OCR) used by the CSS daemon. The path up to the
cdata directory is the Oracle home directory where the CSS daemon
is running (/u01/app/oracle/product/10.1.0/db_1 in this example).
Note: If the value for the local_only parameter is FALSE,
Oracle CRS is installed on this system. See the Oracle Real
Application Clusters Installation and Configuration Guide for
information about removing RAC or CRS.
If this Oracle home directory is not the Oracle home that you want
to remove, you can continue to the "Removing
Oracle
Software" section.
Change directory to the Oracle home directory for an Oracle
Database 10g installation that you are not removing.
Set the ORACLE_HOME environment variable to specify the path to
this Oracle home directory:
Bourne, Bash, or Korn shell:
#
ORACLE_HOME=/u01/app/oracle/product/10.1.0/db_2; export
ORACLE_HOME
C shell:
# setenv ORACLE_HOME
/u01/app/oracle/product/10.1.0/db_2
Enter the following command to reconfigure the CSS daemon to run
from this Oracle home:
# $ORACLE_HOME/bin/localconfig reset $ORACLE_HOME
The script stops the Oracle CSS daemon, reconfigures it in the new
Oracle home, and then restarts it. When the system boots, the CSS
daemon starts automatically from the new Oracle home.
To remove the original Oracle home directory, see the "Removing
Oracle
Software" section.
Deleting the Oracle CSS Daemon
Configuration
To delete the Oracle CSS daemon configuration, follow these steps:
Note: Delete the CSS daemon configuration only if you are
certain that no other Oracle Database 10g installation requires
it.
Remove any databases or ASM instances associated with this Oracle
home. See the preceding sections for information about how to
complete these tasks.
Switch user to root.
Change directory to the Oracle home directory that you are
removing.
Set the ORACLE_HOME environment variable to specify the path to
this Oracle home directory:
Bourne, Bash, or Korn shell:
#
ORACLE_HOME=/u01/app/oracle/product/10.1.0/db_1; export
ORACLE_HOME
C shell:
# setenv ORACLE_HOME
/u01/app/oracle/product/10.1.0/db_1
Enter the following command to delete the CSS daemon configuration
from this Oracle home:
# $ORACLE_HOME/bin/localconfig delete
The script stops the Oracle CSS daemon, then deletes its
configuration. When the system boots, the CSS daemon no longer
starts.
Removing Oracle Software
The following steps describe how to use the Installer to remove
Oracle software from an Oracle home:
Note: Always use the Oracle Universal Installer to remove
Oracle software. Do not delete any Oracle home directories
without first using the Installer to remove the software.
If necessary, log in as the oracle user:
$ su - oracle
Set the ORACLE_HOME environment variable to specify the path of
the Oracle home directory that you want to remove:
Bourne, Bash, or Korn shell:
$ ORACLE_HOME=/u01/app/oracle/product/10.1.0/db_1
$ export ORACLE_HOME
C shell:
$ setenv ORACLE_HOME
/u01/app/oracle/product/10.1.0/db_1
Remove any databases or ASM instances associated with this Oracle
home and delete or reconfigure the Oracle CSS daemon.
See the preceding sections for information about how to complete
these tasks.
Stop any processes running in this Oracle home:
Process Name Command
Database
Control $ORACLE_HOME/bin/emctl
stop dbconsole
Oracle Net
listener $ORACLE_HOME/bin/lsnrctl stop
iSQL*Plus
$ORACLE_HOME/bin/isqlplusctl
stop
Ultra
Search
$ORACLE_HOME/bin/searchctl stop
Start the Installer as follows:
$ $ORACLE_HOME/oui/bin/runInstaller
In the Welcome window, click Deinstall Products.
The Inventory window appears, listing all of the Oracle homes on
the system.
In the Inventory window, select the Oracle home and the products
that you want to remove, then click Remove.
Note: If you choose to remove Oracle JVM, the Oracle Universal
Installer removes all installed products that depend on Oracle
JVM, including Oracle Database.
When the Installer displays a confirmation window asking you to
confirm that you want to deinstall the products and their
dependant components, click Yes.
The Installer displays a progress indicator as it removes the
software.
When the products have been deleted, click Cancel to exit from the
Installer, then click Yes.