Oracle database character set
Hello all -
Please help..................
I will be exporting/importing 6/7 users/schemas/data from one database to the another database on solaris. Users are created.
I am confused about NLS_LANG variable and database characterset.
I have the following questions -
1. What is impact of NLS_LANG variable setting of user session while import/export the data ?
2. Why do we need to set this NLS_LANG user session variable before export/import ?
3.If NLS_LANG variable is not set (doesnot have any value) what would happen ?
4. If I have to set NLS_LANG varible, what should I set it to?
5. How can I see the characterset of my database?
6. Where can I get more info about database charaterset and What are the valid values for database characterset and NLS_LANG varibale ?
Any help would really appreciated...
Thanks a lot.....
RAMA
1. What is impact of NLS_LANG variable setting of user session while import/export the data ?
On export, the data will be converted from the database character set to the character set specified by NLS_LANG. In import, the database will assume that the data is in the character set specified by NLS_LANG and use that value to perform the conversion to the database character set if the two values to not match.
2. Why do we need to set this NLS_LANG user session variable before export/import ?
If your database character set is the same as your OS, you don't necessarily have to set NLS_LANG. For instance, if you have a US7ASCII db, and your OS locale is set to AMERICA_AMERICAN.US7ASCII, there won't be any problems. The only time it's really important to set this is when the db and OS settings don't match.
3.If NLS_LANG variable is not set (doesnot have any value) what would happen ?
If your database character set doesn't match your OS, the data could be garbled because the db will incorrectly transcode the data on import/export.
4. If I have to set NLS_LANG varible, what should I set it to?
Depends on what your database character set is set to (see below).
5. How can I see the characterset of my database?
select * from nls_database_parameters and look for the value set for the NLS_CHARACTERSET parameter. Don't get confused by the NLS_NCHAR_CHARACTERSET, that's for NCHAR datatypes.
So, for instance, if your NLS_CHARACTERSET value is set to UTF8, you would set NLS_LANG to .UTF8 (the dot is important because that's actually shorthand for territory_language.characterset, or language_territory.characterset, I can never remember which comes first. In any case, use the dot). For example:
setenv NLS_LANG .UTF8
6. Where can I get more info about database charaterset and What are the valid values for database characterset and NLS_LANG varibale ?
It's all in the Oracle documentation.
hope this helps.
Tarisa.
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whith SQLPlus, start and stop the db whith svrmgrl etc.
During this install I chose WE8ISO8859P9 as the database
characterset when prompted.
After that I installed Oracle Application Server 3.02, and now
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nullJogchum Reitsma (guest) wrote:
: I installed Oracle 8.05 on Linux successfully: was able to
login
: whith SQLPlus, start and stop the db whith svrmgrl etc.
: During this install I chose WE8ISO8859P9 as the database
: characterset when prompted.
: After that I installed Oracle Application Server 3.02, and now
: I'm getting the
: ORA-12709: error while loading create database character set
: message when I try to start up the database, and the database
: won't mount.
: Platform is RedHat Linux 5.2.
: NLS_LANG set to different settings,
: e.g. AMERICAN_AMERICA.WE8ISO8859P9
: but without success.
: Anyone any clue?
: Thanks!
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Variable Size 2650807904 bytes
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Ora-12709 While Trying To Start The Database [ID 311035.1]
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I want to migrate data from one database to another database But my original database character set is WE8ISO8859P1 but i want to migrate it to
database which has character set UTF8
because of character set it don't shows me Marathi data which is in original database .
it shows me some symbol for Marathi words ..
please help me out.
Thanking You
Gaurav SontakkeDear GauravSontakke,
Since your database version is unknown, i will show you an online documentation of character set migration for 10gR2.
http://www.oracle.com/pls/db102/search?remark=quick_search&word=character+set+migration&tab_id=&format=ranked
http://download.oracle.com/docs/cd/B19306_01/server.102/b14225/ch11charsetmig.htm#sthref1442
*http://download.oracle.com/docs/cd/B19306_01/server.102/b14225/ch11charsetmig.htm#NLSPG011*Please read those carefully.
Hope it Helps,
Ogan -
Setting the database character set problem!
I'm sorry if this is beaten to death, I've read the FAQ and many questions in this forum and I didn't find it.
I want to change the database character set from the beginning. Where do I place the NLS_CHARACTERSET=EL8ISO8859P7 ?
I know I can alter the existing database character but EL8ISO8859P7 is not a superset of WE8ISO8859P1 and I don't want to go to Unicode yet...
Do I have to create a brand new database or can I just alter a script and restart it ?
I didn't find any nls_setting in the database creations, uh, wizard.
Please be as specific as possible because as you can understand I'm not what you can call a db expert...
Thank you.which version of Oracle? these things change between versions.
v7 - update sys.props$ (unsupported!)
v8.0 - rebuild database
v8.1 - alter database change characterset
remember, backup and test before you do this on a used/production database!
good luck, Nogah. -
USER_FILTER and database character set
Hello,
I'm currently working on the integration of a tool into Oracle Text for filtering PDFs. My current approach is to call a command line tool via a USER_FILTER preference, and this works fine as long as the database character set is AL32UTF8. The tool is creating the filtered text as UTF-8.
I'm struggling now with the case that the database character set is not Unicode, for example LATIN1. I had hoped that I can specify a chain of filters for this situation when creating the index, first a USER_FILTER to get the text out of the document and then a CHARSET_FILTER to convert the filtered text from UTF-8 into the database character set. This is my attempt to set this up:
execute ctx_ddl.create_preference ('my_pdf_datastore', 'file_datastore')
execute ctx_ddl.create_preference ('my_pdf_filter', 'user_filter')
execute ctx_ddl.set_attribute ('my_pdf_filter', 'command', 'tetfilter.bat')
execute ctx_ddl.create_preference('my_cs_filter', 'CHARSET_FILTER');
execute ctx_ddl.set_attribute('my_cs_filter', 'charset', 'UTF8');
create index tetindex on pdftable (pdffile) indextype is ctxsys.context parameters ('datastore my_pdf_datastore filter my_pdf_filter filter my_cs_filter');
These are the error messages I'm getting (sorry, German Windows):
FEHLER in Zeile 1:
ORA-29855: Fehler bei Ausf³hrung der Routine ODCIINDEXCREATE
ORA-20000: Oracle Text-Fehler:
DRG-11004: Doppelter oder unvereinbarer Wert f³r FILTER
ORA-06512: in "CTXSYS.DRUE", Zeile 160
The relevant message is DRG-11004, which translates to "duplicate or incompatible value for FILTER".
ORA-06512: in "CTXSYS.TEXTINDEXMETHODS", Zeile 364
So here is my question:
Do I understand it correctly that with the USER_FILTER the text is always expected in the database encoding, and that it is mandatory to create the filtered text in the database character set, or are there any alternatives?
Thanks
StephanThe previous experiments were performed with Oracle 10i. I just saw that in Oracle 11.1.0.7 there is this new feature: "USER_FILTER is now sensitive to FORMAT and CHARSET columns for better indexing performance.".
This seems to be exactly what I was looking for.
Regards
Stephan
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