On Mon, 5 Sep 2011 10:54:21 -0400, John DeSoi wrote:
On Sep 5, 2011, at 7:05 AM, Radosław Smogura wrote:
Hello,
During testing of (forked) driver we had seen following strange
behaviour. JDBC driver mainly invokes Fastpath to obtain LOBs, because
of unscientific privileges I get
1. Some bytes
2. 'E' (error about priviliges)
3. (sic!) 'S' application_name (driver throws exception)
Now I analyse buffer byte after byte
4. 'Z', 00 00 00 05 69 108 (last number may be trash)
It's looks like without 3 everything should be OK, so... I have
question if this is intended and undocumented behaviour, or some async
trashes came in, because docs says nothing about 'S'. I found this
only one app server, but I don't think it makes some "background"
async calls.
'S' is the Sync message.
http://www.postgresql.org/docs/current/static/protocol-message-formats.html
See this section to understand the role of the Sync message:
http://www.postgresql.org/docs/current/static/protocol-flow.html#PROTOCOL-FLOW-EXT-QUERY
John DeSoi, Ph.D.
No, 'S' is sent by backend, and by analysing buffered bytes I'm sure
it's "ParameterStatus", even those after it ('S') I have name of one of
GUC parameters, and it's (empty) value.
Regards,
Radosław Smogura
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