To define a storage map for a relation, you need the Oracle Rdb
    DEFINE privilege to the relation.

    You must execute this statement in a read/write transaction.
    If there is no active transaction and you issue this statement,
    Oracle Rdb starts a read/write transaction implicitly.

    Other users are allowed to be attached to the database when
    you issue the DEFINE STORAGE MAP statement. However, they are
    not allowed to be using the relation whose storage map is being
    defined.