[sqlalchemy] Re: obtaining pid of forked process
On Fri, 12 Feb 2010 13:33:01 +0100, Alex Brasetvik a...@brasetvik.com wrote: On Feb 11, 2010, at 18:58 , Faheem Mitha wrote: sqlalchemy forks a process when it calls the db No, it does not. PostgreSQL forks a new backend process when a connection is established, however. It sounds like that's what you want. Do SELECT pg_backend_pid() to get the PID of the backend process serving your connection. That and other stat functions are documented here: http://www.postgresql.org/docs/current/static/monitoring-stats.html I see. Thanks, that's very helpful. Does the pid/process stay the same across successive calls to text()? I'm guessing that successive calls to text() would take place within the same session, and therefore correspond to the same backend session. If not, how can I get it to return the pid before I start the actual query? In any case, I'll experiment with this. Regards, Faheem. -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
[sqlalchemy] Re: obtaining pid of forked process
On Thu, 11 Feb 2010 13:06:03 -0500, Michael Bayer mike...@zzzcomputing.com wrote: Faheem Mitha wrote: Hi, sqlalchemy forks a process when it calls the db (in my case PostgreSQL, but I don't think it matters) using, for example from sqlalchemy.sql import text s = text(...) um, what ? there's no forking in SQLAlchemy. Ok. Apologies for my cluelessness. Regards, Faheem. -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
Re: [sqlalchemy] Re: obtaining pid of forked process
Faheem Mitha wrote: PostgreSQL forks a new backend process when a connection is established, however. It sounds like that's what you want. Do SELECT pg_backend_pid() to get the PID of the backend process serving your connection. That and other stat functions are documented here: http://www.postgresql.org/docs/current/static/monitoring-stats.html I see. Thanks, that's very helpful. Does the pid/process stay the same across successive calls to text()? I'm guessing that successive calls to text() would take place within the same session, and therefore correspond to the same backend session. If not, how can I get it to return the pid before I start the actual query? In any case, I'll experiment with this. you would connect: conn = engine.connect() check the PID: pid = conn.execute(SELECT pg_backend_pid()).scalar() then continue as needed: conn.execute(text(...)) Regards, Faheem. -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en. -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
[sqlalchemy] Re: obtaining pid of forked process
On Fri, 12 Feb 2010 11:01:23 -0500, Michael Bayer mike...@zzzcomputing.com wrote: you would connect: conn = engine.connect() check the PID: pid = conn.execute(SELECT pg_backend_pid()).scalar() then continue as needed: conn.execute(text(...)) Thanks, Michael. That's very clear and helpful. Regards, Faheem. -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
