Обсуждение: Questions about enabling SSL

On Mon, Feb 11, 2008 at 04:58:35PM -0700, fabrix peñuelas wrote:
> If ssl is enable  in postgresql decreanse the performance of the database?
> How much?

The performance impact of an encrypted connection depends on how
expensive the queries are and how much data they return.  A query
that joins several tables and aggregates millions of rows might
take several seconds or minutes to run and return only a few rows;
for such a query the impact of an encrypted connection is insignificant.
But if you make many queries that run quickly and return large
result sets then you might indeed notice the impact of an encrypted
connection vs. a non-encrypted connection.  The most reliable way
to assess the impact would be to run representative queries over
your data and measure the difference yourself.

--
Michael Fuhr

On Mon, Feb 11, 2008 at 05:37:51PM -0700, Michael Fuhr wrote:
> On Mon, Feb 11, 2008 at 04:58:35PM -0700, fabrix peñuelas wrote:
> > If ssl is enable  in postgresql decreanse the performance of the database?
> > How much?
>
> The performance impact of an encrypted connection depends on how
> expensive the queries are and how much data they return.

Another consideration is how much time you spend using each connection
vs. how much time it takes to establish each connection.  A thousand
simple queries over the same encrypted connection might be significantly
faster than running each query over a separate unencrypted connection,
which in turn will probably be significantly faster than using
separate encrypted connections that must each carry out a relatively
expensive key establishment.

--
Michael Fuhr