Oracle

ID #1086

Problème de changement de taille de certaines données depuis la 11g.

Un problème de changement de taille de certaines données depuis la 11g a été observé sur des types VARCHAR définis avec des BYTE plutôt que des CHAR.

Le passage en 11g de plusieurs bases sont réalisées en unicode (UTF-8 avancé : AL32UTF8).
Pour information, ce "charater set" AL32UTF8 supporte le XML, et peut également stocker plusieurs caractères spéciaux (éàç..) au besoin sur 1,2,3 ou 4 byte(s). 

L'attention à apporter sera plutôt lors des futurs INSERT/UPDATE dans les tables.
Par exemple, si une colonne est définie VARCHAR2(3 byte), l'insertion de la chaine "aaé" ne sera plus possible, car elle sera stockée sur 4 byte. L'erreur sera la suivante : ORA-12899: valeur trop grande pour la colonne

 

Solution:

Pour ne plus avoir de soucis, il faut travailler systématiquement avec l'option CHAR plutôt que BYTE lors de la création des tables;

Par exemple, VARCHAR2(3 CHAR) à la place de VARCHAR2(3 byte) permet d'éviter ce genre de souci !

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Dernire mise jour: 2011-06-20 08:44
Auteur: Michel Preti
Rvision: 1.0

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SQL can execute iequres against a database, retrieve,update,insert data from a database and empty refer to an empty result of no rows and NULL refer to a table with one row holding a NULL value.
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