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Thread: Ora-12701 create database chracter set is not known

  1. #1
    Join Date
    Oct 2000

    I have done the following :

    Connect to SYS.

    update props$ set value$='UTF8' where name='NLS_CHARACTERSET';

    update props$ set value$='UTF8' where name='NLS_NCHAR_CHARACTERSET';

    - restart the database

    However, I put a wrong value instead of UTF8 I put BIG5. Then, I got the following error. Is there a way that I can revert back? I just need to reconnect to SYS but since the database won't open, I can connect as an User. : (

    SVRMGR> startup
    ORACLE instance started.
    Total System Global Area 36257168 bytes
    Fixed Size 64912 bytes
    Variable Size 19234816 bytes
    Database Buffers 16777216 bytes
    Redo Buffers 180224 bytes
    Database mounted.
    ORA-12701: CREATE DATABASE character set is not known

    I got the error and the database refuses to open.

    Please help and thank in advance.

  2. #2
    Join Date
    Jun 2000
    Madrid, Spain
    You must not inert,update, delete in SYS tables!
    I dont know how you could go back, I only know that to change character sets in Oracle you have to recreate the database

  3. #3
    Join Date
    Apr 2000
    Baltimore, MD
    Delete any file(s) associated with the db, and recreate the db.

  4. #4
    Join Date
    Dec 2000
    Ljubljana, Slovenia

    I'm sure you've performed a full backup before you updated the PROPS$, so Halo's sugestion might sound a little drastic ;-))

    Serriously, if you don't have the backup your only option is to create a new database. Changing character set the way you've tried was quite popular among dba's in the past, however it was also well known that it is totaaly unsupported and that if you do a typo you can say bye-bye to your database. It seemed you've learned it the hard way.

    In 8i (or was it allready in 8.0?) Oracle introduced a new ALTER DATABASE option:

    ALTER DATABASE SET CHARACTER SET new_charset. That way Oracle prevents you to specify a wrong name for the characterset. Nevertheles, Oracle still recomends a full backup before you perform this operation.
    Jurij Modic
    ASCII a stupid question, get a stupid ANSI
    24 hours in a day .... 24 beer in a case .... coincidence?

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