Tomas Vondra <tomas.von...@2ndquadrant.com> writes:
> On 10/17/2017 10:44 PM, Joe Carlson wrote:
>> What I was wondering is what is the performance differences between a
>> row level security implementation:
>> ...
>> and an implementation where I add on the constraints as part of each
>> select statement:
> The main point of the RLS is enforcing an order in which the conditions
> are evaluated.
Yeah. Because of that, I would *not* recommend RLS if you can equally
well stick the equivalent conditions into your queries. There is way
too much risk of taking a serious performance hit due to a bad plan.
An alternative you might consider, if simplifying the input queries
is useful, is to put the fixed conditions into a view and query the
view instead. That way there's not an enforced evaluation order.
regards, tom lane
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