Re: [HACKERS] session id and global storage
Hi, I cant find any function, which tells me something like session id. Is there something like that? I need it in my AM, because I need to know, if something which I wrote in file was written in this current session or previously. How about select procpid||' '||backend_start from pg_stat_activity; Yours, Laurenz Albe Something like this would be maybe possible, but this select can return more rows, when the user is connected with more instances... David Hoksza You could do this: SELECT procpid||' '||backend_start FROM pg_stat_activity WHERE datname = current_database() AND usename = session_user AND client_addr = inet_client_addr() AND client_port = inet_client_port(); Regards, Rodrigo ---(end of broadcast)--- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
Re: [HACKERS] session id and global storage
Rodrigo De Leon wrote: Hi, I cant find any function, which tells me something like session id. Is there something like that? I need it in my AM, because I need to know, if something which I wrote in file was written in this current session or previously. How about select procpid||' '||backend_start from pg_stat_activity; Yours, Laurenz Albe Something like this would be maybe possible, but this select can return more rows, when the user is connected with more instances... You could do this: SELECT procpid||' '||backend_start FROM pg_stat_activity WHERE datname = current_database() AND usename = session_user AND client_addr = inet_client_addr() AND client_port = inet_client_port(); That's pretty roundabout. We already expose (hex coded) pid.starttime as a session identifier in log_line_prefix (it's the %c escape) so I don't see any reason not to provide either the same thing directly in a function, or at least to expose the backend pid. If you need it in backend C code, the data can be fetched from MyProcPid and MyProcPort-session_start.tv_sec cheers andrew ---(end of broadcast)--- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
Re: [HACKERS] session id and global storage
That's pretty roundabout. We already expose (hex coded) pid.starttime as a session identifier in log_line_prefix (it's the %c escape) so I don't see any reason not to provide either the same thing directly in a function, or at least to expose the backend pid. That would be nice. ---(end of broadcast)--- TIP 6: explain analyze is your friend
Re: [HACKERS] session id and global storage
Andrew Dunstan [EMAIL PROTECTED] writes: Rodrigo De Leon wrote: You could do this: SELECT procpid||' '||backend_start FROM pg_stat_activity WHERE datname = current_database() AND usename = session_user AND client_addr = inet_client_addr() AND client_port = inet_client_port(); That's pretty roundabout. Indeed. Use pg_backend_pid() instead: SELECT whatever FROM pg_stat_activity WHERE procpid = pg_backend_pid(); A difficulty with this in existing releases is that pg_stat_activity lags behind reality, so that you won't see your session listed in it until you've been connected at least half a second or so. 8.2 won't have that problem. regards, tom lane ---(end of broadcast)--- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
Re: [HACKERS] session id and global storage
It seems MyProcID is what I was searching for... David Hoksza DH Something like this would be maybe possible, but this select can DH return more rows, when the user is connected with more instances... DH David Hoksza DH Hi, I cant find any function, which tells me something like session id. Is there something like that? I need it in my AM, because I need to know, if something which I wrote in file was written in this current session or previously. AL How about AL select procpid||' '||backend_start from pg_stat_activity; AL Yours, AL Laurenz Albe DH ---(end of DH broadcast)--- DH TIP 5: don't forget to increase your free space map settings ---(end of broadcast)--- TIP 6: explain analyze is your friend
Re: [HACKERS] session id and global storage
Hannu Krosing said: Ãhel kenal päeval, N, 2006-06-01 kell 10:10, kirjutas David Hoksza: It seems MyProcID is what I was searching for... On a buzy server with lots of connects, procID will repeat quite often. log_line-prefix has a sessionid gadget: Session ID: A unique identifier for each session. It is 2 4-byte hexadecimal numbers (without leading zeros) separated by a dot. The numbers are the session start time and the process ID Assuming PIDs are not reused within one second that will be unique. cheers andrew ---(end of broadcast)--- TIP 5: don't forget to increase your free space map settings
Re: [HACKERS] session id and global storage
Something like this would be maybe possible, but this select can return more rows, when the user is connected with more instances... David Hoksza Hi, I cant find any function, which tells me something like session id. Is there something like that? I need it in my AM, because I need to know, if something which I wrote in file was written in this current session or previously. AL How about AL select procpid||' '||backend_start from pg_stat_activity; AL Yours, AL Laurenz Albe ---(end of broadcast)--- TIP 5: don't forget to increase your free space map settings
[HACKERS] session id and global storage
Hi, I cant find any function, which tells me something like session id. Is there something like that? I need it in my AM, because I need to know, if something which I wrote in file was written in this current session or previously. And second thing - it would be great if I could save pointer in some global storage, because I would like to access my dynamically created tree in more subsequent scans, which is impossible with void pointer stored just in opaque scan structure:( Thnaks, David Hoksza ---(end of broadcast)--- TIP 5: don't forget to increase your free space map settings
