Re: WIP patch - INSERT-able log statements

Ok..... Summarizing the key changes required on my patch, based on the
discussions so far are :

- The log_destination will include a new option 'sql'. This can be given with
other combinations of stderr, syslog or eventlog.
- The sql logs will be written in log_directory in a file log_filename.SQL
- The log output will be in COPY format and will include the following
information, irrespective of the log_line_prefix setting.
( timestamp_with_milliseconds,  timestamp, username,  databasename,
sessionid,  host_and_port, host, proc_id, command_tag,  session_start,
transaction_id,  error_severity,  SQL_State_Code, statement/error_message);

Anything else missing ? ?

Rgds,
Arul Shaji

On Tue, 20 Feb 2007 19:03, Guillaume Smet wrote:
> On 2/20/07, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> > Of course, the other side of that coin is that syslog is known to drop
> > messages altogether under sufficient load. (At least on some platforms;
> > dunno about yours.)
>
> Yes I know. That's one of the reason why I asked for the bahaviour of
> 7.4 log_duration back in 8.2. It's a good compromise which allows us
> not to lose lines and have a good level of information (at least, the
> best we can have). Async IO helps.
>
> Moreover we use syslog to send the log lines via UDP so we know that
> it's not perfect. But it works nice most of the time. We know that we
> can't log every query (we use a combination of log_duration and
> log_min_duration_statement - I patched 8.1 for that) because if we do
> so we lose a lot of lines and queries are not consistent but we can't
> do it locally with stderr anyway due to I/O. This method has been
> reliable for more than a year and our daily reports are consistent.

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