Tuesday, November 6, 2007

Changing DB 32-Bit to 64-Bit


1. Ensure that there is ample free size for the 64bit release installation.
Recommended free space should be 3G.

2. Start the Installer GUI.

3. On the File Locations Screen, create a new name and path for the 64bit
oracle installation under the Destination.

A typical entry would be

Name: orahome920_64b
Path: /u01/app/oracle/product/9.2.0-64b

4. Proceed with the installation. Stop at the configuration assistant
configuration screen.

5. Install the latest 64bit patch set under the new oracle installation.


The instructions in this section guide you through changing the word-size of
your current release (switching from 32-bit software to 64-bit software or vice versa).

Complete the following steps to change the word-size of your current release:

1. Start SQL*Plus.

2. Connect to the database instance AS SYSDBA.

3. Run SHUTDOWN IMMEDIATE on the database:

4. Perform a full offline backup of the data depending on the available backup
mechanism, eg BCV, Unix file copy.

5. If the initialization parameter file eg initSID.ora, spfileSID.ora, listener.ora, sqlnet.ora resides within the old OR
ACLE_HOME, then copy it to the corresponding location of the new 64b it ORACLE_HOME. If the parameter files are symbol
ic links to another location, then the symbolic links have to be created in the new ORACLE_HOME.

The same links have to be created in new $ORACLE_HOME/dbs.

6. Change your active Oracle instance environment to point at the new 64Bit ORACLE_HOME.
Edit /var/opt/oracle/oratab if using dbhome/oraenv to set the environment.


i) set it to the new 64bit Oracle Home path


Change the essential environment setting eg $ORACLE_HOME,$LD_LIBRARY_PATH to use new 64bit Oracle Home Path if h

export ORACLE_HOME=/u01/app/oracle/product/9.2.0

Change to

export ORACLE_HOME=/u01/app/oracle/product/9.2.0-64b

7. Set AQ_TM_PROCESSES=0 if it is not.

a) If using initSID.ora to start instance, then add it to the init file.

b) If using spfileSID.ora to start instance,then the database can be startup and the parameter set by running th
e below command.


c) shutdown the database again.
9. Set _system_trig_enabled = false.

a) If using initSID.ora to start instance, then add it to the init file.
b) If using spfileSID.ora to start instance, then the database can be startup and the parameter set by running th
e below command.


c) shutdown the database again.

The parameter should be set to FALSE for scripts that perform dictionary operations as the objects on which the triggers d
epend may become invalid or be dropped, causing the triggers to fail and thus preventing the scripts from running successf

10. When migrating from a 32-bit Oracle version to a 64-bit Oracle version, Oracle recommends doubling the size of paramet
ers such as:


11. At a system prompt, change to the new 64bit ORACLE_HOME/rdbms/admin

12. Start SQL*Plus.

13. Connect to the database instance AS SYSDBA.



15. Run the following script:

SQL> @?/rdbms/admin/catalog.sql

16. Check for DBMS_PACKAGE validity.

17. If invalid, run below

SQL> alter package dbms_standard compile;
18. Run the following script:

SQL> @?/rdbms/admin/catproc.sql

19. Set the system to spool results to a log file for later verification of

SQL> SPOOL /tmp/catoutw.log

20. Run utlirp.sql:

SQL> @?/rdbms/admin/utlirp.sql

The utlirp.sql script recompiles existing PL/SQL modules in the format required by the new database. This script first
alters certain dictionary tables. Then, it reloads package STANDARD and DBMS_STANDARD, which are necessary for using P
L/SQL. Finally, it triggers a recompile of all PL/SQL modules, such as packages, procedures, types, and so on.

21. Turn off the spooling of script results to the log file:


Then, check the spool file and verify that the packages and procedures compiled successfully. You named the spool fil
e in Step 12; the suggested name was catoutw.log. Correct any problems you find in this file.



23. Remove the parameter aq_tm_processes or set value back to the original value.

a) If using initSID.ora to start instance, then remove or edit it from the init file after shutting down the data

b) If using spfileSID.ora to start instance, then the parameter can be change by running the below command.


To remove the parameter.

24. Remove the parameter _system_trig_enabled = FALSE

a) If using initSID.ora to start instance, then remove it from the init file after shutting down the database.

b) If using spfileSID.ora to start instance, then the parameter can be removed by running the below command.

SQL> ALTER SYSTEM RESET "_system_trig_enabled" SCOPE=SPFILE SID=.*.;

25. The word-size of your database is changed. The database can be shutdown and reopen for normal use.


RDR said...

Basically, the OS should be 64bit in the first place right? Or is it possible that you have a 32 bit DB in a 32bit OS and change to 62bit?

M A D A N M O H A N said...

You are right the O/s Should be 64-bit for 64-bit database.

We cannot have 64-bit DB running on 32-bit O/s ,but reverse is very much possible.

M A D A N M O H A N said...


Please see the Question 90 in "Oracle Apps DBA Interview Questions" post.

Hope i cleared your doubt.


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Anonymous said...

What are the downs of having the 32bit version running on a 64 bit server. Is it really necessary to make the word size changes.

Easter said...

Hi RDR, Please see the Question 90 in "Oracle Apps DBA Interview Questions" post. Hope i cleared your doubt. Rgds, Madan

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