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IDS Forum

Re: Change table owner

Posted By: Spokey Wheeler
Date: Wednesday, 14 June 2017, at 6:04 a.m.

In Response To: Re: Change table owner (BENJAMIN THOMPSON)

What's wrong with DBCREATE_PERMISSION?

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________________________________
From: ids-bounces@iiug.org <ids-bounces@iiug.org> on behalf of BENJAMIN THOMPSON <benjamin.thompson@skybettingandgaming.com>
Sent: Wednesday, June 14, 2017 10:59:03 AM
To: ids@iiug.org
Subject: Re: Change table owner [39371]

Hi,

I hope readers will excuse this longish post but this is an area of
frustration for me too. I had already voted for request #2 but have added my
vote to #1.

With an evolving schema, this whole area requires constant vigilance to keep
in order and in the worst case it can lead to security holes. Avoiding the
problem in the first place has to be part of the solution as well as providing
a means to fix it afterwards. In an RDBMS like Oracle where table ownership is
interpreted much more strictly than a non-ANSI Informix database, there is a
simple command you can run to ensure all objects in your session are created
with the correct owners: "alter session set current_schema=;". I have added a
comment to one of the RFEs to this effect.

There is a wrapper for "create table" statements "create schema authorization
<username>" which kind of does the same thing but it only works when creating
a table and its scope is the next statement only.

Instead you have to employ a lot of different methods to ensure that tables,
indices, constraints etc. have consistent ownership or you avoid the problem
by always deploying as the schema owner. (I don't consider deploying as the
"schema owner" a good solution because you ideally want separation between the
user ids for the apps, users and application schema.)

Another example is adding a column with a constraint. If I run under my own
user id:
alter table X add col1 int default 0 not null;
This creates a "not null" constraint, where it can be seen in sysconstraints
that I am the owner and not the existing owner of the table. The only way
around this is a named constraint, e.g.
alter table X add col1 int default 0 not null constraint
schemaowner.constrname;

There is a more subtle version of this where you modify a column that already
has a "not null" constraint.

The problem with such a feature is making a business case for it as the
product continues to work just fine despite these problems. I guess the main
one is the time I have to put into checking upgrade scripts.

Ben.

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