Re: Add session statistics to pg_stat_database

On Fri, 2020-12-25 at 20:28 +0900, Masahiro Ikeda wrote:
> As a user, I want this feature to know whether
> clients' session activities are as expected.
>
> I have some comments about the patch.
>
> 1. pg_proc.dat
>
> The unit of "session time" and so on says "in seconds".
> But, is "in milliseconds" right?
>
> 2. monitoring.sgml
>
> IIUC, "active_time" includes the time executes a fast-path function and
> "idle in transaction" includes "idle in transaction(aborted)" time.
>
> Why don't you reference pg_stat_activity's "state" column and
> "active_time" is the total time when the state is "active" and "fast
> path"?
> "idle in transaction" is as same too.
>
> 3. pgstat.h
>
> The comment of PgStat_MsgConn says "Sent by pgstat_connection".
> I thought "pgstat_connection" is a function, but it doesn't exist.
>
> Is "Sent by the backend" right?
>
> Although this is a trivial thing, the following row has too many tabs.
> Other structs have only one space.
> // }<tab><tab><tab>Pgstat_MsgConn;

Thanks for the feedback.

I am currently on vacations and will take a look after January 7.

Yours,
Laurenz Albe