revoking permissions

Hi- I have some database and table level permissions which need cleaning up. In other words, I have to revoke a ton of users. Rather than write a long sql script to revoke database and table level permissions explicitly, I was thinking about updating the sysusers and systabauth tables. To revoke database level permissions: delete from sysusers where username <> "informix"; To revoke table level permissions: delete from systabauth where grantee <> "informix" and tabid >99; I have tried it out on a few test databases, but I want to know if anyone sees any problems in doing it this way. Thanks for any info that you might have. Brian brian@anasazi.com