Re: [HACKERS] Implementing RESET CONNECTION ...

Christopher Kings-Lynne <chriskl@familyhealth.com.au>

From: Christopher Kings-Lynne <chriskl@familyhealth.com.au>
To: Bruce Momjian <pgman@candle.pha.pa.us>
Cc: Oliver Jowett <oliver@opencloud.com>, Karel Zak <zakkr@zf.jcu.cz>, Tom Lane <tgl@sss.pgh.pa.us>, Kris Jurka <books@ejurka.com>, Hans-Jürgen Schönig <postgres@cybertec.at>, eg@cybertec.at, List pgsql-patches <pgsql-patches@postgresql.org>, pgsql-hackers@postgresql.org
Date: 2005-06-05T04:00:31Z
Lists: pgsql-hackers
What would be absolutely ideal is a reset connection command, plus some 
way of knowing via the protocol if it's needed or not.

Chris

Bruce Momjian wrote:
> What did we decide on RESET CONNECTION.  Do we want an SQL command or
> something only the protocol can do?
> 
> ---------------------------------------------------------------------------
> 
> Oliver Jowett wrote:
> 
>>(cc'ing -hackers)
>>
>>Karel Zak wrote:
>>
>>
>>>I think command status is common and nice feedback for client. I think
>>>it's more simple change something in JDBC than change protocol that is
>>>shared between more tools.
>>
>>There is a bit of a queue of changes that would be nice to have but 
>>require a protocol version change. If we're going to change the protocol 
>>for any of those we might as well handle RESET CONNECTION cleanly too.
>>
>>
>>>We need some common way how detect on client what's happen on server --
>>>a way that doesn't mean change protocol always when we add some
>>>feature/command to backend. The command status is possible use for this.
>>
>>Command status only works if commands are directly executed. If you can 
>>execute the command indirectly, e.g. via a PL, then you'll miss the 
>>notification. Making RESET a top-level-only command isn't unreasonable, 
>>but using command status won't work as a general approach for notifying 
>>clients.
>>
>>We have a mechanism for GUC changes that uses a separate message 
>>(ParameterStatus). Perhaps that should be generalized to report 
>>different sorts of connection-related changes.
>>
>>-O
>>
>>---------------------------(end of broadcast)---------------------------
>>TIP 7: don't forget to increase your free space map settings
>>
> 
>