ADD/Remove UNDO tablespace in oracle database

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ADD/Remove UNDO tablespace in oracle database:-
=====================================

 every database having default undo tablespace, if you want to change it do follow below procedure.

1. first create new tablespace with new(as you want to create)
Example:-
CREATE UNDO TABLESPACE <NEW_NAME> DATAFILE '<datafile_location/name.dbf>' SIZE 1000M AUTOEXTEND OFF ONLINE RETENTION NOGUARANTEE
BLOCKSIZE 8K
FLASHBACK ON;

ALTER SYSTEM SET UNDO_TABLESPACE = <NEW_NAME>;
ALTER SYSTEM SET UNDO_RETENTION = <SET as per NEED>;

Once new one created, if you want drop old one follow steps below.
check any session already using old one  with below sql

SQL> select tablespace_name, owner, segment_name, status from dba_rollback_segs where TABLESPACE_NAME='UNDOTBS1' and status='ONLINE';

you will get SID&Serial# if any in use, kill them if have or else you can proceed to drop old one.

To kill
SQL> alter system kill session 'SID,SERIAL#';

To drop
SQL> drop tablespace undotbs1 including contents and datafiles;



please help to share your suggestions,  or  share your experience on same kind of issue in comment session.
  your sharing or suggestions will helps me to improve in my future posts.

Thanks for the visit!!!

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