Changing database character set from US7ASCII to AL32UTF8

Our database is running on Oracle database 10.1.0.4.0 (AIX) The following are its parameters:
SQL> select value from NLS_DATABASE_PARAMETERS where parameter='NLS_CHARACTERSET';
VALUE
US7ASCII
We would like to change the database character set to AL32UTF8. After following Metalink notes: 260192.1 (which helped us resolve "Lossy" and "Truncated" data, the final output of the CSSCAN utility is:
[Scan Summary]
All character type data in the data dictionary are convertible to the new character set
All character type application data are convertible to the new character set
[Data Dictionary Conversion Summary]
The data dictionary can be safely migrated using the CSALTER script
We have no (0) Truncation and Lossy entries on the .txt file. We only have Changeless and Convertible. Now accdg to the documentation, we can do a FULL EXP and FULL IMP. But it did not detail how to do the conversion on the same database. The discussion on the document tells how to do it from one database to another database. But how about on the same database?
We cannot use CSALTER as stated on the document.
(Step 6
Step 12
12.c) When using Csalter/Alter database to go to AL32UTF8 and there was NO "Truncation" data, only "Convertible" and "Changeless" in the csscan done in point 4:)
After performing a FULL export of the database, how can we change its character set? What do we need to do the the existing database to change its character set to AL32UTF8 before we import back our dump file into the same database?
Please help.

There you are! Thanks! Seems like I am right in my understanding about the Oracle Official Documentation. Thanks!
Hmmmmm...when you say:
*"you can do selective export of only convertible tables, truncate the tables, use CSALTER, and re-import."*
This means that:
1. After running csscan on database PROD, i will take note of the convertible tables in the .txt output file.
2. Perform selective EXPORT on PROD (EXP the convertible tables)
3. Truncate the convertible tables on PROD database
4. Use CSALTER on PROD database
5. Re-import the tables into PROD database
6. Housekeeping.
Will you tell me if these steps are the correct one? Based on our scenario: This is what i have understood referring to the Official Doc.
Am i correct?
I really appreciate your help Sergiusz.

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Is your data size above GBs? If not this might help before installation I guess ->
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http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14225/ch11charsetmig.htm#sthref1476
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If you have not already done so, read up on Character Set Migration and using the CSSCAN tool to verify the database before making any changes.

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SHUTDOWN IMMEDIATE;
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Hi Sergiusz,
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Need to change character set from WE8MSWIN1252 to AL32UTF8.

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Pl also see these Docs
AL32UTF8 / UTF8 (Unicode) Database Character Set Implications          [Document 788156.1]
Changing the NLS_CHARACTERSET to AL32UTF8 / UTF8 (Unicode)          [Document 260192.1]
If you are using EBS, then also see
For 11i - Appendix A of "Oracle Applications 11i Internationalization Guide          [Document 333785.1]"
For R12 - Appendix A of "Globalization Guide for Oracle Applications Release 12          [Document 393861.1]"
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I made a full backup from production database which has AL32UTF8
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Can anyone help with the way to change the database character set.
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Thanks

You don't need to change the database character set. You have only to set the correct character set at
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SQL> /
PARAMETER            VALUE
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SQL>then at OS prompt :
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$ exp ..............
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http://oracle.ittoolbox.com/documents/popular-q-and-a/changing-the-character-set-of-an-oracle-database-1601
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Changing database character set from US7ASCII to AL32UTF8

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