Posts Tagged ‘ALTER DATABASE CHARACTER’

Change Oracle Database Character Set WE8MSWIN1252 to AL32UTF8

April 15th, 2018, posted in Oracle Queries
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Changing character set for Oracle database.

My scenario is to support Arabic data format.

My existing oracle database character set is : WE8MSWIN1252

My requirement is to change this character set to  AL32UTF8 ( Which will support Arabic format)

Step :1

Set your ORACLE_HOME and SID .

Windows :

SET  ORACLE_HOME= E:\app\7stl\product\11.1.0\db_1

SET SID=ORCL

Linux : Use export command to set ORACLE_HOME and SID.
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Step 2 :

Connect sqlplus through command prompt.

Enter user name as below shown in screenshot.
user-name:    / as sysdba

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step 3:

Shutdown your database immediate or normal by using below command.

shutdown normal
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Step 4 :

mount your database by using below command

startup mount

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step 5:

Now execute below commands

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.

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Step 6:

SQL> ALTER DATABASE OPEN;
Database altered.

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Step 7:

Now change the character set by using below command.

ALTER DATABASE CHARACTER SET AL32UTF8;

If you facing this error ” ORA-12712: new character set must be a superset of old character set”
use below command to overcome from this issue.

ALTER DATABASE CHARACTER SET INTERNAL_USE AL32UTF8;

If you facing below error while executing above command then follow below steps:

ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-30556: functional index is defined on the column to be modified

Execute this command first then followed by character set command.

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SQL> alter system set “_system_trig_enabled”=FALSE

System altered.

Step 8:

SQL> ALTER DATABASE CHARACTER SET INTERNAL_USE AL32UTF8;

Database altered.

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Step 9:

SQL> SHUTDOWN NORMAL;
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> STARTUP;

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Now query your Database to confirm the change in CHARACTER SET.

Use below query :

select * from database_properties where PROPERTY_NAME in (‘NLS_CHARACTERSET’,  ‘NLS_NCHAR_CHARACTERSET’);

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Your character set has changed successfully.

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