Revoking the database security administrator role
A DBSA uses the REVOKE DBSECADM statement to take away database security administrator authority from a user who previously was granted this role.
You must be a DBSA to revoke the DBSECADM role. You must know
the login name from whom you want to revoke the DBSECADM role.
Use the REVOKE DBSECADM statement to revoke the DBSECADM
role, as described in HCL
Informix® Guide to SQL: Syntax.
The following statement revokes DBSECADM authority from user sam:
REVOKE DBSECADM FROM sam;