Обсуждение: use of pg_stat_database

<table border="0" cellpadding="0" cellspacing="0"><tr><td style="font: inherit;" valign="top"><p class="MsoNormal"
style="MARGIN:0cm 0cm 0pt"><span lang="EN-GB" style="mso-ansi-language: EN-GB"><font size="3"><font face="Times New
Roman">Hellow,</font></font></span><pclass="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"
style="mso-ansi-language:EN-GB"><font size="3"><font face="Times New Roman"></font></font></span>  <p class="MsoNormal"
style="MARGIN:0cm 0cm 0pt"><span lang="EN-GB" style="mso-ansi-language: EN-GB"><font size="3"><font face="Times New
Roman">Ilike to track the number of committed transaction for my database</font></font></span><p class="MsoNormal"
style="MARGIN:0cm 0cm 0pt"><span lang="EN-GB" style="mso-ansi-language: EN-GB"><font size="3"><font face="Times New
Roman">SoI use the following command </font></font></span><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span
lang="EN-GB"style="mso-ansi-language: EN-GB"><font size="3"><font face="Times New Roman">Select * from
pg_stat_database;</font></font></span><pclass="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"
style="mso-ansi-language:EN-GB"><font face="Times New Roman" size="3"> </font></span><p class="MsoNormal"
style="MARGIN:0cm 0cm 0pt"><span lang="EN-GB" style="mso-ansi-language: EN-GB"><font size="3"><font face="Times New
Roman">Thecolumn xact_commit gives me the number of transaction committed</font></font></span><p class="MsoNormal"
style="MARGIN:0cm 0cm 0pt"><span lang="EN-GB" style="mso-ansi-language: EN-GB"><font face="Times New Roman"
size="3"> </font></span><pclass="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB" style="mso-ansi-language:
EN-GB"><fontsize="3"><font face="Times New Roman">But if I execute the same command another time, the column
xact_commitgives me an other number.</font></font></span><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span
lang="EN-GB"style="mso-ansi-language: EN-GB"><font face="Times New Roman" size="3"> </font></span><p class="MsoNormal"
style="MARGIN:0cm 0cm 0pt"><span lang="EN-GB" style="mso-ansi-language: EN-GB"><font size="3"><font face="Times New
Roman">Betweenthe first select and the second select I don’t execute any transaction on my
database</font></font></span><pclass="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB"
style="mso-ansi-language:EN-GB"><font face="Times New Roman" size="3"> </font></span><p class="MsoNormal"
style="MARGIN:0cm 0cm 0pt"><span lang="EN-GB" style="mso-ansi-language: EN-GB"><font size="3"><font face="Times New
Roman">Please,can any one help me to understanding the cause of the change?</font></font></span><p class="MsoNormal"
style="MARGIN:0cm 0cm 0pt"><span lang="EN-GB" style="mso-ansi-language: EN-GB"><font face="Times New Roman"
size="3"> </font></span><pclass="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-GB" style="mso-ansi-language:
EN-GB"><fontsize="3"><font face="Times New Roman">Thanks very much </font></font></span></td></tr></table><br /> 

In response to abdelhak benmohamed :
> Hellow,
> 
>  
> 
> I like to track the number of committed transaction for my database
> 
> So I use the following command
> 
> Select * from pg_stat_database;
> 
>  
> 
> The column xact_commit gives me the number of transaction committed
> 
>  
> 
> But if I execute the same command another time, the column xact_commit gives me
> an other number.

I can't reproduce that:

test=*# Select sum(xact_commit) from pg_stat_database; sum
-------73470
(1 row)

-- 5 minutes later:

test=*# Select sum(xact_commit) from pg_stat_database; sum
-------73470
(1 row)


> 
>  
> 
> Between the first select and the second select I don?t execute any transaction
> on my database

Autovacuum?


Andreas
-- 
Andreas Kretschmer
Kontakt:  Heynitz: 035242/47150,   D1: 0160/7141639 (mehr: -> Header)
GnuPG-ID:   0x3FFF606C, privat 0x7F4584DA   http://wwwkeys.de.pgp.net

On Tue, Jun 30, 2009 at 7:13 AM, abdelhak
benmohamed<abdelhak.benmohamed@yahoo.fr> wrote:
> Hellow,
>
>
>
> I like to track the number of committed transaction for my database
>
> So I use the following command
>
> Select * from pg_stat_database;
>
>
>
> The column xact_commit gives me the number of transaction committed
>
>
>
> But if I execute the same command another time, the column xact_commit gives
> me an other number.
>
>
>
> Between the first select and the second select I don’t execute any
> transaction on my database
>
>
>
> Please, can any one help me to understanding the cause of the change?

try turning on statement logging (log_statement='all').  please post
q&a time questions to -general.

merlin