ORA-12899: value too large for column (actual: 27, maximum: 20)

導入數據時報錯以下錯誤，這是因為原來的數據庫是GBK的，每個漢字兩個字節，但新數據庫是UTF-8的，每個漢字是三個字節，導致超過長度了。

ORA-12899: value too large for column  (actual: 27, maximum: 20)

 

解決：

開始-->運行-->cmd,之后輸入:"sqlplus /nolog"，進入"SQL>"的提示，按照下面給出的命令依次執行就可以了：

SQL>connect username/password as SYSDBA;

SQL>SHUTDOWN IMMEDIATE;

SQL>STARTUP MOUNT;
SQL>ALTER SYSTEM ENABLE RESTRICTED SESSION;
SQL>ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;
SQL>ALTER SYSTEM SET AQ_TM_PROCESSES=0;
SQL>ALTER DATABASE OPEN;

SQL> ALTER DATABASE CHARACTER SET ZHS16GBK ;
ALTER DATABASE CHARACTER SET ZHS16GBK;
*ERROR at line 1:
ORA-12712: new character set must be a superset of old character set

報字符集不兼容，此時下INTERNAL_USE指令不對字符集超集進行檢查：

SQL>ALTER DATABASE CHARACTER SET INTERNAL_USE ZHS16GBK;
SQL>SHUTDOWN IMMEDIATE;
SQL>STARTUP;