Change the characters of WE8ISO8859P1 to AL32UTF8 database
We want to change our database characterset to AL32UTF8 of WE8ISO859P1.When executing the csscan of WE8ISO859P1 to WE8ISO859P1 in the same character set, we see data with loss. It appears in the attachment.
When executing csscan to WE8MSWIN1252, we get data with loss.
When running with AL32UTF8 csscan, we get even amount of data with losses.
Report of the WE8ISO859P1 to the WE8ISO859P1
[Application summary of data Conversion]
Immutable data type Convertible truncation with loss
--------------------- ---------------- ---------------- ---------------- ----------------
VARCHAR2 0 0 38 865 2,544,258,408
CHAR 138 377 0 0 0
LONG 10,418,973 0 0 76
CLOB 0 0 0 0
VARRAY 0 0 0 0
--------------------- ---------------- ---------------- ---------------- ----------------
Total 0 0 38 941 2,554,815,758
Total percentage 99.998% 0.000 0.000% 0.002%
Of WE8ISO8859P1 to WE8MSWIN1252.
[Application summary of data Conversion]
Immutable data type Convertible truncation with loss
--------------------- ---------------- ---------------- ---------------- ----------------
VARCHAR2 0 0 38 865 2,544,258,408
CHAR 138 377 0 0 0
LONG 10,418,973 0 0 76
CLOB 0 0 0 0
VARRAY 0 0 0 0
--------------------- ---------------- ---------------- ---------------- ----------------
Total 0 0 38 941 2,554,815,758
Total percentage 99.998% 0.000 0.000% 0.002%
Of WE8ISO8859P1 to AL32UTF8,.
[Application summary of data Conversion]
Immutable data type Convertible truncation with loss
--------------------- ---------------- ---------------- ---------------- ----------------
VARCHAR2 2,525,222,555 18 717 38 865 19,017,193
CHAR 138 377 0 0 0
LONG 120 132 0 76 10,298,841
CLOB 0 0 0 0
VARRAY 0 0 0 0
--------------------- ---------------- ---------------- ---------------- ----------------
2,535,659,773 19,137,325 Total 18 717 38 941
Total percentage 99.249 0,749% 0.001 0.002%
Now the problem is on with data loss. As we see same amount of loss of WE8ISO859P1 to WE8ISO859P1 and WE8ISO8859P1 to AL32UTF8.
But I think I'm confused everytime I open the scan.err file, I never see any character replacement.
What would be my next step for character set migration. If we need to take care of the data with loss? Go directly to AL32UTF8? If csscan show many with loss of data, but while opening scan.err, we see no character replacement. What should we do now to go to AL32UTF8?
Any suggestion is really welcome.
Thank you.
When you open the scan.err file, you will not see the wildcard, but source codes. You should look for Windows characters since the code 0 x 80-0x9f range. Scan.err also, shows only a prefix of each data, even if a given value does not show any problem codes, codes may be in the end substring of the value.
You should basically do the following: for each column of data with losses reported in the analyse.txt you look at the column and try to identify its content. More likely that you will see is Western European text Windows (WE8MSWIN1252). It comes to WE8ISO8859P1 more Windows specific codes in the range of 0 x 80-0x9f (quotes, the Euro symbol, etc.). According to the database, other possibilities are:
1 binary, for example the results of encrypting procedures DBMS_OBFUSCATION_TOOLKIT, images, etc.
2 Western Europe data page in the code UTF-8 Unicode or MS-DOS 437 or 850 (registered in garbage - in the scenario of garbage-out, when NLS_LANG is incorrectly on the DB character set).
3. data in other languages.
The measures depends on the identified data. If only WE8MSWIN1252 is identified, the solution is to analyze the DB with fromchar and tochar WE8MSWIN1252 value. This should report no loss of data and you can run csalter.plb to migrate the characters of WE8ISO8859P1 in WE8MSWIN1252 database. Then you can proceed to WE8MSWIN1252 migration to Unicode.
IMPORTANT: It is insufficient to simply scan with fromchar and tochar value WE8MSWIN1252. This combination of settings tends to never share data with loss! You need to visually inspect the data to see if it is readable in Western Europe. The scan is just a sine qua non for csalter.plb.
If you identify binary data, you must update your application first to use a type of binary data (RAW, LONG RAW, BLOB). Once the column is binary, you can continue with the migration.
If you identify Western European data in other character sets, you must run the UPDATE with the CONVERT function to convert the data in WE8ISO8859P1 or WE8MSWIN1252 before migration to Unicode.
If you identify data in other languages, you should unload the data in external text files (with NLS_LANG value. WE8ISO8859P1 avoid conversion), divided by language. Then, after the conversion to Unicode format, you should load the data into the database using SQL * Loader, defining the character set appropriate data in control files.
IMPORTANT: With data attachment in the database, you must generally take a look at who put these data in the database or applications that use the data. These applications can have configuration changes to make sure that they do not store incorrect data more and to ensure that they can properly read the now cleaned data.
-Sergiusz
Tags: Database
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[https://www.dropbox.com/s/cqsbioq5nwishfo/Oracle%20Settings.PNG]
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I think that something is as SESSION, ALTER DATABASE, ALTER etc, but I'm not sure. I want to make this change permanently.
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Please see the attached link.
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LuigggyeI moved your new problem in a new thread.
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We would like to change the value AL32UTF8 database character. After completing the Metalink notes: 260192.1 (who helped us solve data "With" and "Truncated", is the final result of the CSSCAN utility):
[Scanning summary]
All data type characters in the data dictionary can be convertible to the new character set
All data of character type is convertible to the new character set
[Summary of the Data Conversion dictionary]
The data dictionary can be migrated safely using the CSALTER script
We have no truncation and with (0) entry on the .txt file. We have Changeless and Convertible. Now accdg to the documentation, we can do a FULL EXP and FULL IMP. But it does not detail how to do the conversion on the same database. The discussion on the document explains how do from one database to another database. But what about on the same database?
We cannot use CSALTER as indicated on the document.
(Step 6
Step 12
12.c) when you use Csalter/Alter database to AL32UTF8 and there was NO data "Truncation", only "Convertible" and "Changeless" in the csscan in point 4 :)
After you COMPLETE the database export, how can we change its character set? What must we do the existing database to change its character value AL32UTF8 until we import back our in the same dump file database?
Help, please.You cannot use CSALTER indeed you have given application convertible. Only the application data does not change are supported by the script.
We do not support the conversion in place of the version of database you have except via Oracle Consulting services. Please upgrade to one of the versions of database supported by the DMU (http://www.oracle.com/technetwork/database/globalization/dmu/overview/index.html) utility and ask the DB fix required for the enhanced version and platform supported by the Oracle. I think there is already a patch for 10.2.0.5 on AIX 64-bit POWER but this is to be confirmed.
Without the CDS, you can do a selective export of only convertible tables, truncate table, use CSALTER and re - import.
-Sergiusz
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Error ORA-12712 when changing the character set AL32UTF8 to nls
Hello
It is strongly advised to use the AL32UTF8 database character set when ever a database is used with our XML capabilities. The database character set in the installed base is WE8MSWIN1252. To use XML DB functionality, I need to change it to AL32UTF8. But, when I try to do that, I get ORA-12712: new character set must be a superset of the old character set. Is there a way to fix this?
Thanks in advance,
Divya.Hello
a change of we8mswin1252 to al32utf8 is not directly possible. This is because al32utf is not a binary superset of we8mswin1252.
There are 2 options:
-use any export and import
-Use of the altar in a kind of limitedDepends on the method, you can choose the characters in the database, is that only ASCII then the other can work, in other cases, one is necessary.
It is all described in Note 260192.1support, "replacing the NLS_CHARACTERSET AL32UTF8 / UTF8 (Unicode). Get on-site support/metalink.
You can also read the chapters about it in the Guide of globalization: [url http://download.oracle.com/docs/cd/E11882_01/server.112/e10729/ch11charsetmig.htm#g1011430] change characterset.
Herald tiomela
http://htendam.WordPress.com -
Change the character set to AL32UTF8
Hi all
How to change the character set in oracle. My current character set is
PARAMETER VALUE ---------------------------------------------------------------- --------------------------------------------------
NLS_CHARACTERSET WE8MSWIN1252 NLS_NCHAR_CHARACTERSET AL16UTF16 Now, I want to change the set of characters to AL32UTF8.
Help, please.
Thanks in advance.
Concerning
Piku
I had to follow the link below.
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CharacterSet change WE8ISO8859P1 to AL32UTF8
Hello
I restore the rman on new oracle server 11.2.0.3 (previous backup has been Oracle 10.2.0.4).
Then I pass the oracle 11g database but the issue that I am facing at this moment the old database of the characteristics defined on WE8ISO8859P1 which is now transformed into oracle 11.2.0.3 database server.
My required character set is AL32UTF32.
Now is it possible that, during the restoration of the rman backup of oracle 10.2.0.4 on the new server, I updated the character set AL32UTF32.
Thank you for your cooperation.
Kind regards
Adnan HamdussalamBut my question is that, while restoring the backup rman for oracle 10g again more new server database oracle 11g. Before you restore it on the new server is it possible possible to change.
Only possible
* Change the source before the backup.
* Backup & restoreYou can't make the game of character conversion during the restore process.
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