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今天和大家分享ORA-20000: ORA-12899: value too large for column错误的解决方法，本文仅供参考，谢谢！

A fatal error occurred during processing of the com.********.servlet.pub.RegisterCustomer servlet:

ORA-20000: ORA-12899: value too large for column "XXX"."SITE"."STATE" (actual: 21, maximum: 20)Error in XXX.addNewRetailSite: unable to register site for customer number 945394

ORA-06512: at "XXX.ADDNEWRETAILSITE", line 110

ORA-06512: at line 1

Solution： 

alter table SITE modify (STATE varchar2(50));

最后，恭祝各位使用愉快！