--On 02 May 2002 10:08 -0400 Casey Duncan <[EMAIL PROTECTED]> wrote:

> ZPsycopgDA (for postgres) is definitely multi-threaded. I think zPopyDA
> is  too.

http://www.zope.org/Members/glpb/solaris says:

> The report also investigates in a cursory way the effects of adding a
> database adapter to the equation. A test was
> carried out to compare the effect of changing the threading model on a
> site doing queries against an Oracle database using
> DCOracle2. It was found that queries that involved writes on the database
> were forced to be completed in serial (this is
> unsuprising), whilst read requests could be carried out in parallel. In
> addition, ZSQL Methods have the ability to cache the rows they fetch from
> a database for a given query. The results show that
> caching of SQL queries can produce a significant performance boost.



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