Oracle:

CREATE ROLLBACK SEGMENT

CREATE [ PUBLIC ] ROLLBACK SEGMENT rollback_segment
[ TABLESPACE tablespace | storage_clause ]...];

example

CREATE TABLESPACE rbs_ts
DATAFILE 'rbs01.dbf' SIZE 10M
EXTENT MANAGEMENT LOCAL UNIFORM SIZE 100K;

/* This example and the next will fail if your database is in
automatic undo mode.
*/
CREATE ROLLBACK SEGMENT rbs_one
TABLESPACE rbs_ts;

CREATE ROLLBACK SEGMENT rbs_one
TABLESPACE rbs_ts
STORAGE
( INITIAL 10K );

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