WELCOME Oracle Globalization Support, NLS LENGTH · PDF fileWELCOME Oracle Globalization...

2012 © Trivadis

BASEL BERN LAUSANNE ZÜRICH DÜSSELDORF FRANKFURT A.M. FREIBURG I.BR. HAMBURG MÜNCHEN STUTTGART WIEN

WELCOME Oracle Globalization Support, NLS_LENGTH_SEMANTICS, Unicode and Everything Else Markus Flechtner

DOAG-Regionaltreffen NRW 13.05.2013

14.05.13 Oracle Globalization Support, NLS_LENGTH_SEMANTICS, Unicode and Everything Else

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2012 © Trivadis

Trivadis is a market leader in IT consulting, system integration and the provision of IT services focusing on and technologies in Switzerland, Germany and Austria.

We offer our services in the following strategic business fields: Trivadis Services takes over the interacting operation of your IT systems.

Our company.


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With over 600 specialists and IT experts in your region.

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Stuttgart


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About me ..

§  Senior Consultant, Trivadis, Duesseldorf

§  Working with Oracle since 1993 §  Development (Forms, Reports, PL/SQL) §  Support §  Database Administration

§  Started at Trivadis in 2008

§  Focus §  Oracle Real Application Clusters §  Database Migration

§  Teacher §  O-AI – Oracle Architecture and Internals §  O-RAC – Oracle Real Application Clusters §  O-NF11g DBA – Oracle 11g New Features for DBAs

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2012 © Trivadis

AGENDA

1.  Character sets & Character Conversion

2.  Unicode

3.  Oracle Parameters

4.  Oracle-Tools: Csscan & csalter

5.  Oracle-Tools: Database Migration Assistant for Unicode (DMU)

6.  Changing the Character set of an existing Database

7.  Change Database and Character set

8.  NLS_LENGTH_SEMANTICS & SQL + PL/SQL

9.  Recommendations

10. Links & further information


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2012 © Trivadis

Character sets (1)

§  “A character set is just an agreement on what numeric value a symbol has“, i.e. a mapping table (code point) §  How to display a numeric value (in the database) as a corresponding character

in the output §  How to store an input value (e.g. numeric value) in the database (or file etc.)

§  Some well known character sets §  WE8ISO8859P15 („= WE8ISO8859P1 +€-character + some more“) §  WE8MSWIN1252 §  AL32UTF8 §  UTF8 §  US7ASCII – not recommended §  WE8ISO8859P1 (ISO 8859, Page 1, for Western Europe) – not recommended


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Character sets (2)

§  Oracle 11.2 supports 247 different character sets

§  Oracle database supports different types of character sets §  SB: single-byte encoding §  MB: multi-byte encoding §  FIXED: fixed-width multi-byte encoding §  ASCII: strict superset of ASCII §  EURO: Euro symbol supported §  UDC: User-Defined-Character set (using „Oracle Locale Builder“)

§  See Oracle 11.2 Globalization Support Guide, Appendix A („Locale data“) for more information


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Character sets (3) – well known character sets

§  The WE8ISO8859-family §  WE8ISO8859P1 §  WE8ISO8859P15 §  ..

§  ISO/IEC 8859

§  Differences between ISO8859-1 and -15

§  See http://en.wikipedia.org/wiki/ISO8859 for more information


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Character Conversion: from client to server (and vice versa)


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WE8MSWIN1252 WE8ISO8859P1

Database Character set = WE8ISO8859P15

INSERT (‚€‘) è  Converted to è  WE8ISO8859P15

Stored: „€“

SELECT

But the € cannot be displayed In WE8ISO8859P1!

It‘s all about the correct and compatible setting of database character set, client OS character set and client Oracle character set!

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Character set- and NLS-information on the database


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SQL> SELECT PROPERTY_VALUE FROM DATABASE_PROPERTIES WHERE PROPERTY_NAME like ’NLS%’; PROPERTY_NAME PROPERTY_VALUE ------------------------------ ----------------------------------- NLS_LANGUAGE AMERICAN NLS_TERRITORY AMERICA NLS_CURRENCY $ NLS_ISO_CURRENCY AMERICA NLS_NUMERIC_CHARACTERS ., NLS_CHARACTERSET WE8MSWIN1252 NLS_CALENDAR GREGORIAN NLS_DATE_FORMAT DD-MON-RR NLS_DATE_LANGUAGE AMERICAN NLS_SORT BINARY NLS_TIME_FORMAT HH.MI.SSXFF AM NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZR NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZR NLS_DUAL_CURRENCY $ NLS_COMP BINARY NLS_LENGTH_SEMANTICS BYTE NLS_NCHAR_CONV_EXCP FALSE NLS_NCHAR_CHARACTERSET AL16UTF16 NLS_RDBMS_VERSION 11.2.0.3.0

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AGENDA


2.  Unicode










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What's Unicode? - Introduction

§  “Unicode is a computing industry standard for the consistent encoding, representation and handling of text expressed in most of the world's writing systems.” (http://en.wikipedia.org/wiki/Unicode)

§  Development started in 1987, current version is Unicode 6.2, representing more than 110.000 characters

§  Universal encoded character set

§  Store information in any language è supports globally used databases

§  AL32UTF8 = variable width (1 – 4 bytes per character)

§  UTF-8 = variable width ( 1 – 3 bytes/character)

§  UTF-16 = fixed width (2 or 4 bytes/character)

§  Oracle supports Unicode since Oracle 8.1


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Character set AL32UTF8 - Introduction

§  Reminder: “A character set is just an agreement on what numeric value a symbol has“

§  Supported as database character set since Oracle 9i

§  Recommended character set

§  Check your clients: Old Oracle 8i (or earlier) clients have problems with AL32UTF8 è use UTF8

§  Characters have variable length (1 – 4 bytes)è any character other than US7ASCII (A-Z,a-z,0-1 and ./?,*# etc..) needs more than one byte è the database may need some more space (csscan will report an estimation)


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Character set AL32UTF8 – bytes of storage for different chars


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(from Oracle 11.2 Globalization Support Guide, © Oracle)

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Unicode vs. Classical 8-bit-character set

§  Database 1 – “old fashioned” 8-bit-Character set

§  Database 2 – “modern” Unicode Character set SQL> SELECT PROPERTY_VALUE FROM DATABASE_PROPERTIES WHERE PROPERTY_NAME=’NLS_CHARACTERSET'; PROPERTY_VALUE ---------------------------------------------------- AL32UTF8 SQL> INSERT INTO CSDEMO.UMLAUTE VALUES ('äöüÄÖÜß'); SQL> SELECT ZEICHEN,DUMP(ZEICHEN) FROM CSMDEMO.UMLAUTE; ZEICHEN DUMP(ZEICHEN) ---------- ---------------------------------------------------------------------- äöüÄÖÜß Typ=1 Len=14: 195,164,195,182,195,188,195,132,195,150,195,156,195,159


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SQL> SELECT PROPERTY_VALUE FROM DATABASE_PROPERTIES WHERE PROPERTY_NAME=‘NLS_CHARACTERSET'; PROPERTY_VALUE ---------------------------------------------------- WE8ISO8859P15 SQL> INSERT INTO CSDEMO.UMLAUTE VALUES ('äöüÄÖÜß'); SQL> SELECT ZEICHEN,DUMP(ZEICHEN) FROM CSMDEMO.UMLAUTE; ZEICHEN DUMP(ZEICHEN) ---------- ---------------------------------------- äöüÄÖÜß Typ=1 Len=7: 228,246,252,196,214,220,223

2012 © Trivadis

Character set AL32UTF8 – Technical Limits within Oracle

UTF8 | AL32UTF8 | AL16UTF16 (1 to 3 bytes)| (1 to 4 bytes)| (2 bytes) MIN MAX | MIN MAX | MIN MAX ------------------------------------------------ CHAR 2000 666 | 2000 500 | N/A N/A VARCHAR2 4000 1333 | 4000 1000 | N/A N/A ------------------------------------------------ NCHAR 2000 666 | N/A N/A | 1000 1000 NVARCHAR2 4000 1333 | N/A N/A | 2000 2000

§  There is still an underlying limit of 4000 Bytes per VARCHAR2 column è you can store 4000 “a” (single-byte-character) in such a column

§  Every multi-byte character reduces the number of available characters (e.g. you can store 3997 “a” + 1 “€”, because the EUR-character is a 3 bytes character in the AL32UTF8 Character set, and 3994 “a” + 2 “€” and so on)


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AGENDA


2.  Unicode










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Oracle Parameters: NLS_LANG (1)

§  „NLS_LANG is used to let Oracle know what character set your client's OS is USING so that Oracle can do (if needed) conversion from the client's character set to the database character set.“

§  Character set in NLS_LANG not necessarily equal to DB character set! §  If both are equal this may be beneficial in terms of performance (OCI)

§  è On typical Western European Windows Clients §  NLS_LANG=<LANGUAGE>_<TERRITORY>.WE8MSWIN1252

§  è On Unix systems the character set depends on the locale -  Check LC_ALL -  See http://docs.oracle.com/cd/E11882_01/server.112/e10729/applocaledata.htm


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-- Format <Language>_<Territory>.<ClientCharacterSet> NLS_LANG = GERMAN_SWITZERLAND.AL32UTF8

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Oracle Parameters: NLS_LANG (2)

§  Recommendation on NLS_LANG §  Set the character set part of NLS_LANG to the character set of the OS, e.g

WE8MSWIN1252 on a Windows client

§  Recommendation on the database character set §  Choose a character set which is a superset of the character sets of all clients


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Oracle Parameters: NLS_LENGTH_SEMANTICS (1)

§  Specifies the default length semantics to use for VARCHAR2 and CHAR table columns

§  Possible values are §  BYTE (Default) §  CHAR

§  New hint in the 11.2 documentation:

§  è change the parameter to CHAR on session level only!


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§  Oracle has changed its’ mind:

§  See the 11.1-documentation http://docs.oracle.com/cd/B28359_01/server.111/b28298/ch2charset.htm

§  (it’s a “documentation bug”) J


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§  Oracle recommends to specify the NLS_LENGTH_SEMANTICS on column level:


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SQL> CREATE TABLE unicode_demo ( byte_string VARCHAR2(10 BYTE), char_string VARCHAR2(10 CHAR) ) Table created. SQL> DESCRIBE unicode_demo Name Null Typ ----------- ---- ----------------- BYTE_STRING VARCHAR2(10 BYTE) CHAR_STRING VARCHAR2(10) SQL> INSERT INTO unicode_demo (byte_string) VALUES ('äöüÄÖÜ'); ORA-12899: Value too large for column [..]

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AGENDA


2.  Unicode










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Oracle-Tools: Csscan & csalter (1): Introduction

§  CSSCAN §  Character set Scanner

§  CSALTER §  Script to change the character set of a database ($ORACLE_HOME/rdbms/

admin/csalter.plb) §  Changes data dictionary only, additional actions for user data may be required

§  Csscan/csalter to be desupported after 11.2 §  Replaced by DMU (Database Migration Assistant to Unicode)

§  Installation of csscan §  User & Tables created using $ORACLE_HOME/rdbms/admin/csminst.sql §  Default-User CSMIG (after installation user is locked & password expired)


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Oracle-Tools: Csscan & csalter (2): csscan: Parameter


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Character set Scanner v2.2 : Release 11.2.0.3.0 - Production on Tue Sep 25 19:21:34 2012 [..] Keyword Default Prompt Description ---------- ------- ------ ------------------------------------------------- USERID yes username/password FULL N yes scan entire database USER yes owner of tables to be scanned TABLE yes list of tables to scan COLUMN yes list of columns to scan EXCLUDE list of tables to exclude from scan TOCHAR yes new database Character set name FROMCHAR current database Character set name TONCHAR new national Character set name FROMNCHAR current national Character set name PROCESS 1 yes number of concurrent scan process LOG scan base file name of report files [..] ---------- ------- ------ ------------------------------------------------- Scanner terminated successfully.

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Oracle-Tools: Csscan & csalter (3)

§  How to find out if the database contains characters which do not belong to the database character set (and therefore can not be converted to AL32UTF8 or any other character set)?

§  èset FROMCHAR=TOCHAR=current character set (sic!)

§  (in theory) running csscan with TOCHAR=AL32UTF8 makes no sense, because AL32UTF8 contains all characters J


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oracle> csscan userid='"/ as sysdba"' full=y fromchar=WE8ISO8859P15 tochar=WE8ISO8859P15 ARRAY=1024000 LOG=/tmp/csscan_source.log PROCESS=8

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Oracle-Tools: Csscan & csalter (4): Summary Report


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[Data Dictionary Conversion Summary] Datatype Changeless Convertible Truncation Lossy --------------------- ---------------- ---------------- ---------------- ---------------- VARCHAR2 1.778.335 0 0 0 CHAR 94 0 0 0 LONG 128.565 0 0 0 CLOB 22.072 0 0 0 VARRAY 19.812 0 0 0 --------------------- ---------------- ---------------- ---------------- ---------------- Total 1.948.878 0 0 0 Total in percentage 100,000% 0,000% 0,000% 0,000% The data dictionary can be safely migrated using the CSALTER script [Application Data Conversion Summary] Datatype Changeless Convertible Truncation Lossy --------------------- ---------------- ---------------- ---------------- ---------------- VARCHAR2 682.846.037 0 0 872.321 CHAR 134.119.259 0 0 0 LONG 36.528 0 0 0 CLOB 0 0 0 0 VARRAY 0 0 0 0 --------------------- ---------------- ---------------- ---------------- ---------------- Total 817.001.824 0 0 872.321 Total in percentage 99,893% 0,000% 0,000% 0,107%

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Oracle-Tools: Csscan & csalter (5): csscan - Results

§  Changeless §  OK, no more steps required §  Simply run „csalter“ to change the data dictionary

§  Convertible §  Data has to be converted between the character sets (due to a different

character mapping) è export/import

§  Lossy data §  Existing database contains data which cannot be converted to new character

set §  è correct the data so that it can be converted

§  Truncation §  Modify column length (if possible) §  Shorten data if necessary or switch to CLOB


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Oracle-Tools: Csscan & csalter (6): csscan - Truncation

§  Csscan reports the „Max Post Conversion Data Size” (in Byte!)è there is no problem with a size less than 4000 Byte (for VARCHAR2) resp. 2000 (CHAR).

§  Otherwise csscan will report these columns

§  è you have to take care for these columns (shorten data in a senseful way or migrate to CLOB)

§  è otherwise you will loose some information L


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Oracle-Tools: Csscan & csalter (7): csscan – Lossy Data

§  “Lossy” data is data which cannot be converted to the target character set è in most cases result of an invalid NLS_LANG setting on the clientè Data Cleanup is required


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User : DEMO Table : COST_ID Column: DESCRIPTION Type : VARCHAR2(80) Number of Exceptions : 13 Max Post Conversion Data Size: 81 ROWID Exception Type Data(first 30 bytes) ------------------ ------------------ ----------------------------- AAAPYvAANAAADOfAAr lossy conversion GEBŽUDE W1 (BšROGEBŽUDE) AAAPYvAANAAADOPAAs lossy conversion FIRMENANGEH(tm)RIGEN-NEUFAHRZE AAAPYvAANAAADOPABB lossy conversion GEBŽUDE FMI AAAPYvAANAAADOvAAP lossy conversion EINFšHRUNG EURO AAAPYvAANAAADOvABN lossy conversion OBERFLŽCHENVEREDELUNG (KOPF-KS AAAPYvAANAAADQGABJ lossy conversion BENUTZERSERVICE, CAD-SERVICE,

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Oracle-Tools: Csscan & csalter (8): Data Cleanup Script


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SQL> set serveroutput on SQL> BEGIN FOR c_rec IN

(SELECT owner_name,table_name,column_name,data_rowid FROM csmig.csmv$errors WHERE error_type='DATA_LOSS')

LOOP sql_statement := 'SELECT '||c_rec.column_name||' from '||c_rec.owner_name||'.'||c_rec.table_name||' where rowid='||chr(39)||c_rec.data_rowid||chr(39); execute immediate sql_statement into old_value; dbms_output.put_line ('UPDATE '||c_rec.owner_name||'.'||c_rec.table_name|| ' SET '||c_rec.column_name||'='||chr(39)||old_value||chr(39)|| ' where ROWID='||chr(39)||c_rec.data_rowid||chr(39)||';'); END LOOP; END; /

è Results look like [..] UPDATE OWNER.TABELLE SET SPALTE='Durchf?hrung' WHERE ROWID=' … ' ;

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Oracle-Tools: Csscan & csalter (9): csalter

§  Changes the data dictionary only, no user data

§  Only if you have “changeless” data only in the database

§  If you have “convertible” columns in the database, you can run csalter + export/import (on table or user level) to convert the data §  è if you have “convertible” data in your database, switching to a new

database may be the better option §  è old database remains as a fallback solution §  è reorganization etc. possible

§  Csalter runs in restricted mode only


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Oracle-Tools: Csscan & csalter (10): csalter


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SQL> @@csalter.plb 0 rows created. Function created. Function created. Procedure created. This script will update the content of the Oracle Data Dictionary. Please ensure you have a full backup before initiating this procedure. Would you like to proceed (Y/N)?Y old 6: if (UPPER('&conf') <> 'Y') then new 6: if (UPPER('Y') <> 'Y') then Checking data validility... begin converting system objects PL/SQL procedure successfully completed. Alter the database character set... CSALTER operation completed, please restart database PL/SQL procedure successfully completed. 0 rows deleted. Function dropped. Function dropped. Procedure dropped.

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AGENDA


2.  Unicode










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Oracle-Tools: DMU (1) - Overview

§  DMU = Database Migration Assistant for Unicode §  Current Version: 1.2

§  JAVA-based GUI-tool, requires J2SE SDK

§  DMU can convert/migrate/change the NLS_CHARACTERSET to AL32UTF8/UTF8 for a database

§  Successor of csscan/csalter

§  Aggregates all tools in UI

§  Extended analysis features

§  Automation of modification and conversion tasks


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Oracle-Tools: DMU (2) - Resources

§  Download via OTN or MOS: §  http://www.oracle.com/technetwork/products/globalization/dmu/overview/

index-330958.html §  MOS: Patch 13262762


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Oracle-Tools: DMU (3) - Installation

§  Database Server §  A server side patch (9825461) is required §  The patch is included in 11.2.0.3 (and up) §  Patch is not available for all versions (e.g. use of DMU with 11.2.0.2.4 or

10.2.0.5.4 is not supported) è csscan/csalter as “Fallback”

§  Database §  Run $ORACLE_HOME/rdbms/admin/prvtdumi.plb to install the package

SYS.DBMS_DUMA_INTERNAL

§  Client §  J2SE SDK 6 is required

§  See MOS-Note 1272374.1 for more information


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Oracle-Tools: DMU (4) - Workflow


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Oracle-Tools: DMU (5) – Create Repository


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Oracle-Tools: DMU (6) – Scan the database


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Oracle-Tools: DMU (7) – Solve issues


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Oracle-Tools: DMU (8) – “Bulk Cleansing”


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Oracle-Tools: DMU (9) – Convert Database


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Oracle-Tools: DMU (10) – How does DMU do the migration?

1. Put the database into restricted mode.

2. Disable various job queue processes.

3. Drop or disable selected indexes.

4. Disable selected triggers and constraints.

5. Convert the data in user tables and in selected data dictionary tables to Unicode.

6. Convert CLOB columns in the data dictionary.

7. Issue the ALTER DATABASE Character set statement.

8. Enable triggers and constraints; and re-create indexes and constraints.

9. Restore the database instance parameters.

The conversion of a table is performed either by updating its columns with an UPDATE statement or by converting the columns while re-creating the table using the CREATE TABLE AS SELECT statement. The re-creation of a table is faster than an update if most of the table rows must be converted.


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SQL> UPDATE <col> SET <col>=SYS_OP_CSCONV(<col>, 'AL32UTF8');

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AGENDA


2.  Unicode




6.  Changing the Character set of an existing Database (csscan/csalter)






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Changing the Character set of an existing Database (1)

§  Don’t forget to backup your database before changing the Character set!

§  Prepare for csscan

§  Run csscan

§  Evaluate output

§  Data Cleanup

§  Run csalter (remember the backup beforehand)

§  If you have convertible columns or CLOBS: run (partial) export/import to migrate user data

§  Update Statistics


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Change Database & Character set (1) - Preparation

§  Prepare for csscan

§  Run csscan

§  Evaluate output

§  Data Cleanup

§  Create empty tables in new database §  With correct CREATE scripts (<column> VARCHAR2 (xxx CHAR)) §  (or) Adjust column length / semantics after creation


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SQL> ALTER TABLE demo_table 2 MODIFY (demo_column VARCHAR2(20 CHAR));

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Change Database & Character set (2) – Data Transfer

§  Option 1: 1.  Datapump Export 2.  Datapump Import

(with TABLE_EXISTS_ACTION=TRUNCATE|APPEND!)

§  Option 2: §  Streams (è “near-zero-downtime” possible)

§  Option 3: §  Own methods (e.g. INSERT INTO tab@newdb SELECT * from

tab@olddb;

§  Or ...


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NLS_LENGTH_SEMANTICS & SQL + PL/SQL

§  Take care for functions

§  Don’t forget the NLS_LENGTH_SEMANTICS in PL/SQL-code

§  Don’t forget to test the application with the Unicode database!


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Refers to characters of the input character set

Refers to bytes Refers to Unicode characters

LENGTH LENGTHB LENGTHC INSTR INSTRB INSTRC SUBSTR SUBSTRB SUBSTRC ...

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Recommendations – summarized (1) – Parameter

§  Parameter NLS_LANG §  Set the character set part of NLS_LANG to the character set of the OS

-  On Windows: check your environment for the ASCII codepage, choose the appropriate character set, e.g. WE8MSWIN1252 (see MOS-Note 179133.1 for details)

-  On Unix: check your locale setting (“locale –a”), see MOS-Note 264157.1 for details

§  Parameter NLS_LENGTH_SEMANTICS §  On instance level: BYTE §  On column level (in DDL statements): CHAR


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Recommendations – summarized (2) – DB Character set

§  Database character set §  Choose a character set which is a superset of the character sets of all clients

(see Oracle Globalization Support Guide 11.2, Apendix A) for details) §  think about future requirements §  Oracle recommends using Unicode for all new system deployments (Oracle

11.2 Globalization Support Guide, Chapter 2 “Choosing a character set”) §  If you have to store Unicode data, choose a Unicode database character set

§  National character set (for NCHAR, NVARCHAR2, NCLOB) §  As Oracle supports Unicode as a database character set, the “N-datatypes”

should not be used (this simplifies application development)


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Recommendations – summarized (3) – Character set Migration

§  Migrating the character set of a database to Unicode §  Check your existing data carefully and change data which cannot be

converted §  Change the character set of an existing database if you have „changeless“

columns only or if diskspace is an issue §  Otherwise create a new database with character set AL32UTF8 and transfer

the data to the new database using e.g. Datapump -  è old database remains as a fallback solution -  è reorganization possible -  è Near-Zero-Downtime migration possible with Oracle Streams


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Recommendations – summarized (4) - Tools

§  Csscan/csalter §  To be desupported after 11.2 (MOS-Note 1418321.1) §  Fallback solution if DMU cannot be used

§  Database Migration Assistant for Unicode (DMU) §  Successor of csscan/csalter §  Default tool for 12c §  Patch 9825461 required (included in 11.2.0.3 and higher, but not available for

all database versions below 11.2.0.3)


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Links & Further Information (1)

§  Oracle Documentation §  Oracle® Database Globalization Support Guide 11.2

§  Unicode in general §  http://www.unicode.org/versions/Unicode6.1.0/ §  http://www.fileformat.info/info/unicode/utf8.htm §  http://czyborra.com/

§  Database Migration Assistant for Unicode §  http://www.oracle.com/technetwork/products/globalization/dmu/overview/

index.html §  Near-Zero Downtime Migration Model with DMU & Oracle Streams

-  http://www.oracle.com/technetwork/products/globalization/dmu/learnmore/nzd-migration-524223.html


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§  Misc §  http://www.oracle-base.com/articles/9i/character-semantics-and-

globalization-9i.php §  http://www.oracle-base.com/articles/10g/character-set-migration.php §  NLS_LENGTH_SEMANTICS - Why not in the init.ora?

https://blogs.oracle.com/UPGRADE/ §  http://nyoug.org/Presentations/2009/Li_Unicode.pdf §  Oracle Whitepaper „Character Set Migration – Best Practices“ §  „Oracle goes Unicode“

-  Talk of Philipp Michaly and Peter Jensch (Trivadis GmbH) atDOAG-Regionaltreffen, Stuttgart, 23-JAN-2013


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§  My Oracle Support Notes §  144808.1 - Examples and limits of BYTE and CHAR semantics usage

(NLS_LENGTH_SEMANTICS) §  1272374.1 - The Database Migration Assistant for Unicode (DMU) Tool §  276914.1 - The National Character set ( NLS_NCHAR_Character set ) in Oracle 9i, 10g

and 11g §  225912.1 - Changing the Database Character Set ( NLS_Character set ) §  69518.1 - Storing and Checking Character Codepoints in an UTF8/AL32UTF8 (Unicode)

database §  788156.1 - AL32UTF8 / UTF8 (Unicode) Database Character set Implications §  745809.1 - Installing and configuring Csscan in 10g and 11g (Database Character set

Scanner) §  444701.1 - Csscan output explained §  158577.1 - NLS_LANG Explained (How does Client-Server Character Conversion Work?) §  264157.1 - The correct NLS_LANG setting in Unix Environments §  179133.1 - The correct NLS_LANG in a Windows Environment §  1522722.1 - Known Issues With The DMU Tool version 1.2


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BASEL BERN LAUSANNE ZÜRICH DÜSSELDORF FRANKFURT A.M. FREIBURG I.BR. HAMBURG MÜNCHEN STUTTGART WIEN

Thank you for your attention

Trivadis GmbH

Markus Flechtner

Werdener Straße 440227 Düsseldorf

Tel. +49-211-5866 6470 Fax +49-211-5866 6471

[email protected]


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WELCOME Oracle Globalization Support, NLS LENGTH · PDF fileWELCOME Oracle Globalization...

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