On 11/25/2014 06:45 PM, Albe Laurenz wrote:
> An explanation is maybe that prepared statements are handled
> using the extended query protocol, which only exists in v3.
> With the extended query protocol, each statement is first parsed,
> then parameters are bound to the statement and then the statement
> is executed, leading to three client-server round trips.
While Parse/Bind/Execute are separate steps, it is not correct to say
that this means three round trips.
Take a look at the conversation on the wire in Wireshark. You'll see
that generally, the Parse, Bind, Describe, Execute and Sync messages are
all actually sent in the same packet.
--
Craig Ringer http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services