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.





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