On Fri, Feb 27, 2015 at 3:19 PM, aRkadeFR <[email protected]> wrote:
> What do you mean by a single roundtrip?
He means asking the database server to consider multiple queries
(concurrently?), and return data once all of them are available. In
pseudo code:
people, jobs, cities = DB.fetch_multi(
Person.objects.all(),
Job.objects.all(),
City.objects.all())
MySQL's C API supports executing multiple SQL statements in a single
round trip, the data sets are made available in turn to the client API
http://dev.mysql.com/doc/refman/5.7/en/c-api-multiple-queries.html
however, each statement is executed in turn, not concurrently, so the
only speed up you would have is that there is only one query to parse,
and a few small packets less sent to the database server... The
database connection is not torn down between requests to the database.
The only way I could see it having any non-marginal effect is if you
have high latency to your database server. But then you have a lot of
problems.
Cheers
Tom
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