Oracle modify the default character set

In the process of data migration using Oracle Data Pump, because the source database character set is different from the target database character set, data import failure always occurs during the data import process;

1. Check the character set

select * from v$nls_parameters;

2. Modify the character set

SQL> conn /as sysdba 

Connected. 

SQL> shutdown immediate; 

Database closed. 

Database dismounted. 

ORACLE instance shut down. 

SQL> startup mount 

ORACLE instance started. 

Total System Global Area  236000356 bytes 

Fixed Size                   451684 bytes 

Variable Size             201326592 bytes 

Database Buffers           33554432 bytes 

Redo Buffers                 667648 bytes 

Database mounted. 

SQL> ALTER SYSTEM ENABLE RESTRICTED SESSION; 

System altered. 

SQL> ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0; 

System altered. 

SQL> ALTER SYSTEM SET AQ_TM_PROCESSES=0; 

System altered. 

SQL> alter database open; 

Database altered. 

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

Prompt our character set: the new character set must be a superset of the old character set, then we can skip the superset check and make changes:

SQL> ALTER DATABASE character set INTERNAL_USE ZHS16GBK; 

Database altered. 

SQL> select * from v$nls_parameters;

Restart to check whether the change is complete:

SQL> shutdown immediate; 

Database closed. 

Database dismounted. 

ORACLE instance shut down. 

SQL> startup 

ORACLE instance started. 

Total System Global Area  236000356 bytes 

Fixed Size                   451684 bytes 

Variable Size             201326592 bytes 

Database Buffers           33554432 bytes 

Redo Buffers                 667648 bytes 

Database mounted. 

Database opened. 

SQL> select * from v$nls_parameters;

3. Problems that may arise in the process:

startup error ORA-00119 ORA-00132
found the Oracle sample ora file, mine is /home/oracle/app/oracle/product/11.2.0/dbhome_2/dbs/inithelowin.ora
and add in the file:

 *.local_listener='(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP) (HOST=serverIP)(PORT=1521)))'

Start Oracle with pfile file:

startup pfile='/home/oracle/app/oracle/product/11.2.0/dbhome_2/dbs/inithelowin.ora'

Oracle startup results.

Startup mount error, the same ORA-00119 ORA-00132
solution is the same as above.

Oracle modify the default character set

Guess you like