Re: Unique Session ID in PGSQL?

Hello

2011/5/18 Durumdara <durumdara(at)gmail(dot)com>:
> Hi!
>
> Is there any function in PGSQL that returns an unique Session
> identifier of the actual session?
> For example a Bigint, or GUID, or etc?
> Can I get the living Session identifiers from PG?

try

postgres=# select pg_backend_pid();
pg_backend_pid
----------------
17327
(1 row)

postgres=# \x
Expanded display is on.
postgres=# select * from pg_stat_activity where procpid = pg_backend_pid();
-[ RECORD 1 ]----+-----------------------------------------------------------------
datid | 12835
datname | postgres
procpid | 17327
usesysid | 16384
usename | pavel
application_name | psql
client_addr |
client_hostname |
client_port | -1
backend_start | 2011-05-18 14:46:08.099399+02
xact_start | 2011-05-18 15:08:21.5958+02
query_start | 2011-05-18 15:08:21.5958+02
waiting | f
current_query | select * from pg_stat_activity where procpid =
pg_backend_pid();

Regards

Pavel Stehule
>
> We have a little application that uses these infos which are basically
> came from another database system, and I will port this, but I don't
> know, how to do in PGSQL...
> In this app. we associated (stored) the session id to a special field
> in some tables.
> We can retreive the living session ids with a system functions.
>
> If a session died, these records have become irrelevant - we can
> delete them. If the session still alive, we don't touch them, only can
> read the content...
>
> I see adv_locks in pg, but because the quantity of locks are
> pre-determined by the server, I don't choose them.
> I better like a technic that cannot exhaust the number of persistent elements.
>
> Thanks:
>   dd
>
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