Find all needed information about Varchar2 Unicode Support. Below you can see links where you can find everything you want to know about Varchar2 Unicode Support.
https://community.oracle.com/thread/108870
Varchar2 is a multiple length character string with a max. length of 4000 characters. This means Varchar2(100) can store up to 100 Chars.: In the case that I turn UNICODE, or some other multi-byte per : character charset, does my character length drop to 2000, or : remain at 4000, uping the storage requirement to 8000?
https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.1.0/com.ibm.db2.luw.apdv.porting.doc/doc/r0052880.html
Similarly, if you create a database with VARCHAR2 support disabled, you cannot enable VARCHAR2 support for that database later, even by setting the DB2_COMPATIBILITY_VECTOR registry variable. To use the NVARCHAR2 data type, a database must be a Unicode database. Effects
https://docs.oracle.com/cd/B19306_01/server.102/b14225/ch6unicode.htm
6 Supporting Multilingual Databases with Unicode. ... (CHAR, VARCHAR2, CLOB, and LONG). If you prefer to implement Unicode support incrementally or if you need to support multilingual data only in certain columns, then you can store Unicode data in either the UTF-16 or UTF-8 encoding form in SQL NCHAR datatypes ...
https://asktom.oracle.com/pls/apex/asktom.search?tag=utf8-and-varchar2
Jun 22, 2001 · As for why not to user varchar2(30 char), several reasons: 1. There is general uncertainty how long characters can be. For example, if Oracle starts supporting the extended Unicode characters will you go to 6 bytes? Because of this it is very hard to know how large the maximum varchar2 size is. 2.
https://community.oracle.com/thread/2623936
Jan 31, 2014 · A plain VARCHAR2 on a non-Unicode DB (charset is actually WE8MSWIN1252) receives UTF-8 coded data. No - it doesn't. It receives a string of one byte characters in the WE8MSWIN1252 character set. It does not know, or care, what those one-byte characters represent. All you are doing is storing BINARY data in that VARCHAR2 column one byte at a time.
http://houseofbrick.com/convert-your-clobs-to-varchar2-in-oracle-12c/
Jun 03, 2016 · The NVARCHAR2 is a Unicode-only data type and typically contains data in the NLS_NCHAR_CHARACTERSET format. One reason you may want to use NVARCHAR2 is that your DB uses a non-Unicode character set, and you still want to be able to store Unicode data for some columns without changing the primary character set.
http://forums.attunity.com/forums/microsoft-ssis-oracle-connector/oracle-varchar2-mapped-as-dt_wstr-1684.html
Apr 05, 2011 · When I connect to one Oracle database the varchar2 data types are picked up by the Attunity driver as DT_STR, yet on the other database varchar2 is picked up as DT_WSTR (unicode) - I've no idea why?? If I use the standard Microsoft OLE DB connector for Oracle on this second database it pickes up varchar2 correctly as DT_STR
http://www.querytool.com/help/907.htm
Unicode support is not available when using the Microsoft ODBC Driver for Oracle; Data Types. If your database is using a Unicode character set, char, varchar2 and clob data types will hold Unicode values. Irrespective of your database character set nchar, nvarchar2 and nclob data types will hold Unicode values. Unicode Character Set Database
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