Re: PITR Phase 2 - Design Planning

Simon Riggs said:
> On Wed, 2004-04-28 at 18:35, Andrew Dunstan wrote:
>> Simon Riggs wrote:
>>
>> >On Wed, 2004-04-28 at 05:00, Bruce Momjian wrote:
>> >
>> >
>> >>What if we added transaction id to log_line_prefix?  The user could
>> >>then log all queries and find the xid where they want to stop, but
>> >>of course that assumes they have enabled such logging, and they have
>> >>access to the logs.
>> >>
>> >>
>> >
>> >Good thinking.
>> >
>> >I'll have a look at this and come back to you.
>> >
>> log_statement triggered logging happens very early in the process - if
>>  you are logging them all it happens before the statements are even
>> parsed. Would we have an xid to log sensibly at that stage?
>>
>> Perhaps with log_min_duration_statment = 0 we would (i.e. log
>> statements  when finished rather than when started).
>>
>
> Let's call this XLogSpy.
>
> For starters, we only need to look at write transactions. Many
> read-only transactions would not need to be examined, just to know they
> were read only.
>
> Remembering that we're using xlogs for recovery, we perhaps should not
> assume that we have anything other than that which has been archived.
> Currently, that is just the xlogs. So really we need to work off what
> is within them and right now that isn't much at all.
>
> We might optionally include the parsed statement data into the xlog,
> since this might be smaller than the exact text itself and would also
> allow us to filter the xlogs based upon any aspect of the lists.
>
> Not really happy with any of these ideas yet.
>


I don't see how this relates to the log_line_prefix idea, or are you
abandoning that?

cheers

andrew